2020 GMC Sierra 3500 Engine Parts

This table covers the camshafts that open the valves. Read more

3 Camshaft parts for the 2020 GMC Sierra 3500 come from 2 brands — GM GENUINE and MELLING.

This group includes GM GENUINE 12742436, GM GENUINE 12672469 and MELLING MC1432.

This table covers the Camshaft bearings. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

5 Camshaft Bearing parts for the 2020 GMC Sierra 3500 come from GM GENUINE. The "Popular" part is GM GENUINE 19260876.

This group includes GM GENUINE 19260876, GM GENUINE 19260877 and GM GENUINE 19260878 and the remaining parts above.

This table covers the Camshaft bolts. Read more

2 Camshaft Bolt parts are listed for the 2020 GMC Sierra 3500, from ELRING and GM GENUINE.

Listed part numbers: ELRING 857390 and GM GENUINE 11561455.

This table covers the Camshaft Dowel pins. Read more

This group shows a single part: GM GENUINE 24575061.

This table covers the Camshaft Retainer / Thrust plates. Typical signs include warpage, cracks, or a plate that no longer locates the assembly. Confirm which plate the notes describe — backing plates, clutch plates and strike plates are different parts. Read more

5 Camshaft Retainer / Thrust Plate parts are listed for the 2020 GMC Sierra 3500, from ELRING, FEL-PRO, GM GENUINE and 1 other brand. FEL-PRO ES73115 carries the "Popular" badge.

Listed part numbers: FEL-PRO ES73115, ELRING 857150 and ELRING 857320, plus the other parts above.

This table covers the seals at each camshaft end. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

3 Camshaft Seal parts are listed for the 2020 GMC Sierra 3500, from AJUSA, MAHLE / CLEVITE and VICTOR REINZ.

Part numbers include AJUSA 01713900, MAHLE / CLEVITE B32270 and VICTOR REINZ 711836900.

This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

This group shows a single part: GM GENUINE 12735504.

This table covers the Connecting Rod bolts. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 11548432.

This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

3 Conversion / Lower Gasket Set parts for the 2020 GMC Sierra 3500 come from 2 brands — ELRING and AJUSA.

Listed part numbers: AJUSA 54290100, ELRING B45740 and ELRING 050730.

This table covers the crankshafts that turn piston motion into rotation. Read more

This group shows a single part: GM GENUINE 12708884.

This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12729655.

This table covers the Crankshaft Main Bearing Cap bolts. Read more

4 Crankshaft Main Bearing Cap Bolt parts for the 2020 GMC Sierra 3500 come from 2 brands — GM GENUINE and ELRING.

This group includes ELRING B75610, GM GENUINE 11546565 and GM GENUINE 11548076 and the remaining parts above.

This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

6 Crankshaft Seal parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE, ELRING, FEL-PRO and 1 other brand. GM GENUINE 12634614 carries the "Popular" badge.

Listed part numbers: GM GENUINE 12634614, GM GENUINE 12665076 and ELRING 722810, plus the other parts above.

This table covers the Crankshaft Seal covers. Read more

This group shows a single part: GM GENUINE 12705664.

This table covers the gaskets that seal the Crankshaft Seal. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Crankshaft Seal Gasket parts for the 2020 GMC Sierra 3500 come from 2 brands — ELRING and GM GENUINE.

Part numbers include ELRING 837760, ELRING 860570 and GM GENUINE 12627520.

This table covers the Cylinder Head Alignment Dowel pins. Read more

This group shows a single part: GM GENUINE 12570326.

This table covers the bolts that clamp the cylinder head to the block. Read more

5 Cylinder Head Bolt parts for the 2020 GMC Sierra 3500 come from 4 brands — GM GENUINE, AJUSA, FEL-PRO and 1 other brand. The "Popular" part is GM GENUINE 11546959.

This group includes GM GENUINE 11546959, AJUSA 81074000 and FEL-PRO ES73121 and the remaining parts above.

This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

5 Cylinder Head Gasket parts for the 2020 GMC Sierra 3500 come from 5 brands — GM GENUINE, APEX, ELRING and 2 other brands. The "Popular" part is GM GENUINE 12688186.

Part numbers include GM GENUINE 12688186, APEX AHG1448 and ELRING 841840, among others listed above.

This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

3 Cylinder Head Gasket Set parts for the 2020 GMC Sierra 3500 come from 3 brands — AJUSA, ELRING and MAHLE / CLEVITE.

Listed part numbers: AJUSA 52582800, ELRING 860650 and MAHLE / CLEVITE HS55550.

This table covers the Cylinder Head plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 24502262.

This table covers the Engine Block drain plugs. Read more

2 Engine Block Drain Plug parts for the 2020 GMC Sierra 3500 come from GM GENUINE.

Part numbers include GM GENUINE 11602951 and GM GENUINE 11546667.

This table covers the block heaters that warm the coolant or oil in cold weather. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12586687.

This table covers the Engine covers. Read more

2 Engine Cover parts for the 2020 GMC Sierra 3500 come from 2 brands — TECHPRO and VARIOUS MFR.

Part numbers include TECHPRO GM1228175, among others listed above.

This table covers the Engine Cover grommets. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12594875.

This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

This group shows a single part: AJUSA 50530700.

This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

3 Exhaust Valve parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE, MELLING and QUALCAST.

Part numbers include GM GENUINE 12733470, MELLING V5828 and QUALCAST 1013470.

This table covers the crankshaft pulleys / harmonic balancers at the front of the engine. Read more

This group shows a single part: GM GENUINE 12680364.

This table covers the Harmonic Balancer bolts. Read more

2 Harmonic Balancer Bolt parts are listed for the 2020 GMC Sierra 3500, from FEL-PRO and GM GENUINE.

Part numbers include FEL-PRO 73372 and GM GENUINE 11547372.

This table covers the Intake manifolds. Typical signs include an exhaust tick, a vacuum leak, or a gasket that has burned through. Replace the gaskets and hardware; a warped flange will leak with a new gasket alone. Read more

2 Intake Manifold parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE and VAICO.

This group includes GM GENUINE 12748172 and VAICO V570113.

This table covers the Intake Manifold bolts. Read more

This group shows a single part: GM GENUINE 11610472.

This table covers the gaskets between the intake manifold and the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

9 Intake Manifold Gasket parts for the 2020 GMC Sierra 3500 come from 5 brands — GM GENUINE, FEL-PRO, MAHLE / CLEVITE and 2 other brands. The "Popular" part is FEL-PRO MS97402.

This group includes FEL-PRO MS97402, GM GENUINE 12626354 and ELRING 449780 and the remaining parts above.

This table covers the intake valves that let air (and fuel, on port-injected engines) into the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

2 Intake Valve parts are listed for the 2020 GMC Sierra 3500, from MELLING and QUALCAST.

Part numbers include MELLING V5827 and QUALCAST 1013469.

This table covers the mounts that hold the engine to the chassis. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

5 Motor Mount parts are listed for the 2020 GMC Sierra 3500, from DEA / MARMON RIDE CONTROL, ANCHOR, GM GENUINE and 2 other brands. DEA / MARMON RIDE CONTROL A20108 carries the "Popular" badge.

Part numbers include DEA / MARMON RIDE CONTROL A20108, ANCHOR 3588 and GM GENUINE 85043935, among others listed above.

This table covers the Motor Mount kits. Read more

ANCHOR supplies both parts for the 2020 GMC Sierra 3500.

Listed part numbers: ANCHOR 300898 and ANCHOR 300970.

This table covers the engine oils listed by grade and specification for this engine. Typical signs include a low-oil lamp, knocking after a long interval, or oil that has gone thin and black well before the next service. Match the viscosity and spec in the notes (and on the filler cap). The tables group grades — they are not interchangeable. Read more

20 Oil parts are listed for the 2020 GMC Sierra 3500, from MOBIL, LIQUI MOLY, VALVOLINE and 3 other brands. ACDELCO 109324 carries the "Popular" badge.

In the Full Synthetic grade, LIQUI MOLY, MOBIL, VALVOLINE and 3 other brands supply 18 parts: full-synthetic oils. A representative part number is ACDELCO 109324.

The High Mileage (>75,000 Miles) section lists 2 options from MOBIL — oils grouped for high-mileage engines. MOBIL 123842 is listed in this group.

This table covers the gaskets that seal the Oil Cooler. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

5 Oil Cooler Gasket parts for the 2020 GMC Sierra 3500 come from 5 brands — GM GENUINE, DORMAN, ELRING and 2 other brands. The "Popular" part is GM GENUINE 23129010.

This group includes GM GENUINE 23129010, DORMAN 66219 and ELRING 836150 and the remaining parts above.

This table covers the Oil Cooler lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 85724974.

This table covers the harness connectors at the Oil Cooler Line. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock. Read more

This group shows a single part: GM GENUINE 84240295.

This table covers the seals at the Oil Cooler. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Oil Cooler Seal parts for the 2020 GMC Sierra 3500 come from 2 brands — ELRING and GM GENUINE.

Listed part numbers: ELRING B17840 and GM GENUINE 12631281.

This table covers the Oil Dipstick tubes. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12664925.

This table covers the seals at the Oil Dipstick / Tube. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

4 Oil Dipstick / Tube Seal parts for the 2020 GMC Sierra 3500 come from 3 brands — GM GENUINE, ELRING and FEL-PRO.

Part numbers include ELRING 584210, FEL-PRO 73889 and GM GENUINE 24504031, among others listed above.

This table covers the drain plugs in the oil pan. Read more

5 Oil Drain Plug parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE, DORMAN and ELRING. GM GENUINE 55577568 carries the "Popular" badge.

This group includes GM GENUINE 55577568, DORMAN 090948CD and DORMAN 090948 and the remaining parts above.

This table covers the crush washers and gaskets under the oil drain plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

9 Oil Drain Plug Gasket parts for the 2020 GMC Sierra 3500 come from 7 brands — FEL-PRO, DORMAN, GM GENUINE and 4 other brands. The "Popular" part is FEL-PRO 70820.

Part numbers include FEL-PRO 70820, GM GENUINE 12616850 and AJUSA 01288800, among others listed above.

This table covers the Oil Drain Plug inserts. Read more

This group shows a single part: GM GENUINE 11503302.

This table covers the caps on the oil filler neck. Read more

4 Oil Filler Cap parts are listed for the 2020 GMC Sierra 3500, from ACDELCO, CALORSTAT, DORMAN and 1 other brand.

This group includes ACDELCO FC279, CALORSTAT OC2314 and DORMAN 90202 and the remaining parts above.

This table covers the gaskets that seal the Oil Filler Cap. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

4 Oil Filler Cap Gasket parts for the 2020 GMC Sierra 3500 come from 3 brands — ELRING, FEL-PRO and GM GENUINE.

This group includes ELRING 592250, ELRING 823620 and FEL-PRO 73193 and the remaining parts above.

This table covers the Oil Filler tubes. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12668614.

This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive. Read more

12 Oil Filter parts are listed for the 2020 GMC Sierra 3500, from VARIOUS MFR, WIX, ACDELCO and 6 other brands. WIX WL10255XP carries the "Popular" badge.

In the Economy grade, FVP, PRO-TEC and VARIOUS MFR supply 3 parts: the catalog's value-priced group. A representative part number is FVP R0255.

In the High Performance / Heavy Duty grade, WIX and MOBIL supply 2 parts: grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. A representative part number is WIX WL10255XP.

The Standard Replacement section lists 7 options from ACDELCO, WIX, BOSCH and 3 other brands — built to original-equipment specification. ACDELCO PF63 is listed in this group.

This table covers the Oil Filter adapters. Read more

This group shows a single part: GM GENUINE 12600225.

This table covers the Oil Galley plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 11546667.

This table covers the Oil Level sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

2 Oil Level Sensor parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE and WELLS.

Part numbers include GM GENUINE 12696433 and WELLS 5S17582.

This table covers the Oil Level Sensor Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

2 Oil Level Sensor Gasket / O-Ring parts are listed for the 2020 GMC Sierra 3500, from ELRING and GM GENUINE.

Part numbers include ELRING 351330 and GM GENUINE 12638820.

This table covers the Oil nozzles. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12678499.

This table covers the oil pans that hold the engine's oil sump. Read more

This group shows a single part: GM GENUINE 12739177.

This table covers the Oil Pan bolts. Read more

GM GENUINE supplies both parts for the 2020 GMC Sierra 3500.

Listed part numbers: GM GENUINE 12554990 and GM GENUINE 11588725.

This table covers the Oil Pan covers. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12630766.

This table covers the gaskets between the oil pan and the block. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

6 Oil Pan Gasket parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE, ELRING and VICTOR REINZ. GM GENUINE 12666993 carries the "Popular" badge.

This group includes GM GENUINE 12666993, VICTOR REINZ 703141410 and ELRING 837770 and the remaining parts above.

This table covers the seals at the Oil Pressure Sender / Switch. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

One part is listed for the 2020 GMC Sierra 3500 — ELRING 050420.

This table covers the Oil pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit. Read more

3 Oil Pump parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE and MELLING.

Listed part numbers: GM GENUINE 12733670, GM GENUINE 12744612 and MELLING M595.

This table covers the Oil Pump bolts. Read more

This group shows a single part: GM GENUINE 11610074.

This table covers the Oil Pump Control Valve solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid. Read more

This group shows a single part: GM GENUINE 12686431.

This table covers the seals at the Oil Pump Control Valve / Solenoid. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12626252.

This table covers the gaskets that seal the Oil Pump. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

This group shows a single part: GM GENUINE 12638433.

This table covers the windage trays that keep crank windage out of the oil sump. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12619978.

This table covers the pistons that travel in each cylinder. Typical signs include knock, blow-by, or a cylinder that will not hold compression. Piston work is a short-block job. Match bore, pin and ring pack in the notes — not the photo. Read more

5 Piston parts for the 2020 GMC Sierra 3500 come from GM GENUINE.

This group includes GM GENUINE 12699527, GM GENUINE 12699528 and GM GENUINE 12699529 and the remaining parts above.

This table covers the Piston Pin retainers. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 01647383.

This table covers the rings that seal each piston to the cylinder wall. Read more

4 Piston Ring parts for the 2020 GMC Sierra 3500 come from 2 brands — GM GENUINE and HASTINGS MANUFACTURING.

This group includes GM GENUINE 12735470, GM GENUINE 12661872 and HASTINGS MANUFACTURING 2N5295 and the remaining parts above.

This table covers the pushrods that transfer lifter motion to the rocker arms. Read more

3 Push Rod parts for the 2020 GMC Sierra 3500 come from 3 brands — GM GENUINE, MELLING and SBI.

This group includes GM GENUINE 12619828, MELLING MPR696 and SBI 1901555.

This table covers the rocker arms that transfer cam motion to the valves. Read more

5 Rocker Arm parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE, ENGINETECH, MELLING and 2 other brands. GM GENUINE 12619829 carries the "Popular" badge.

This group includes GM GENUINE 12619829, ENGINETECH ER913 and MELLING MR913 and the remaining parts above.

This table covers the Rocker Arm nuts. Read more

This group shows a single part: GM GENUINE 11546449.

This table covers the timing chains that keep the cams in time with the crank. Read more

5 Timing Chain parts for the 2020 GMC Sierra 3500 come from 5 brands — MELLING, CLOYES, GM GENUINE and 2 other brands. The "Popular" part is MELLING 3SRH60.

Listed part numbers: MELLING 3SRH60, CLOYES 94205 and GM GENUINE 12646387, plus the other parts above.