2021 GMC Sierra 1500 Drivetrain Parts

This table covers the actuators that engage four-wheel drive at the transfer case or axle. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

5 4WD Actuator parts for the 2021 GMC Sierra 1500 come from 3 brands — AAM, GM GENUINE and WELLS. The "Popular" part is WELLS 1S17362.

Listed part numbers: WELLS 1S17362, AAM 40244942 and AAM 40270497, plus the other parts above.

This table covers the 4WD Actuator Clutch shafts. Read more

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 85520528.

This table covers the 4WD Actuator Clutch sleeves. Read more

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 85120721.

This table covers the 4WD Actuator housings. Read more

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 84242534.

This table covers the Axle / Differential assemblies. Read more

10 Axle / Differential Assembly parts for the 2021 GMC Sierra 1500 come from GM GENUINE. The "Popular" part is GM GENUINE 84443626.

This table covers the Axle housings. Read more

GM GENUINE supplies both parts for the 2021 GMC Sierra 1500.

This group includes GM GENUINE 85656042 and GM GENUINE 84553989.

This table covers the seals at the Axle Intermediate Shaft. 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 Axle Intermediate Shaft Seal parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 23371177 and GM GENUINE 84983738.

This table covers the Axle shafts. Read more

6 Axle Shaft parts for the 2021 GMC Sierra 1500 come from 2 brands — GM GENUINE and AAM. The "Popular" part is AAM 40248181.

Part numbers include AAM 40248181, GM GENUINE 84687710 and AAM 40248180, among others listed above.

This table covers the Axle Shaft 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

4 Axle Shaft Bearing parts for the 2021 GMC Sierra 1500 come from 2 brands — GM GENUINE and MOTIVE GEAR.

This group includes GM GENUINE 23266134, GM GENUINE RW2010 and GM GENUINE 84428298 and the remaining parts above.

This table covers the Axle Shaft Housing tubes. Read more

This group shows a single part: GM GENUINE 85877111.

This table covers the Axle Shaft Lock / Snap rings. Read more

2 Axle Shaft Lock / Snap Ring parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 84428312 and GM GENUINE 84428317.

This table covers the Axle Shaft Pilot 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

2 Axle Shaft Pilot Bearing parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE FD102 and GM GENUINE S1421.

This table covers the Axle Shaft retainers and clips. Read more

3 Axle Shaft Retainer / Clip parts are listed for the 2021 GMC Sierra 1500, from GM GENUINE and DORMAN.

Listed part numbers: DORMAN 13851, GM GENUINE 14012746 and GM GENUINE 23243730.

This table covers the seals where an axle shaft exits the housing. 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 Axle Shaft Seal parts are listed for the 2021 GMC Sierra 1500, from TIMKEN and GM GENUINE. GM GENUINE 291360 carries the "Popular" badge.

This group includes GM GENUINE 291360, GM GENUINE 251355 and TIMKEN SL260491 and the remaining parts above.

This table covers the Axle Vent valves. 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

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 26063647.

This table covers the complete CV axle shafts from differential (or hub) to wheel. Typical signs include a click in tight turns, grease flung around the wheel well, or a vibration that builds with speed. A torn boot caught early is a boot kit; caught late it is the whole axle. Torque the axle nut to the method in the notes. Read more

10 CV Axle parts are listed for the 2021 GMC Sierra 1500, from GM GENUINE, GSP, TOP NOTCH and 1 other brand. GM GENUINE 85838008 carries the "Popular" badge.

The Specialty - For Lifted Vehicles section lists 3 options from GSP, TOP NOTCH and TRAKMOTIVE — grouped under the catalog's "Specialty - For Lifted Vehicles" designation — the notes column spells out what sets them apart. GSP NCV10187XDP is listed in this group.

The Standard Replacement section lists 7 options from GM GENUINE, TOP NOTCH, GSP and 1 other brand — built to original-equipment specification. GM GENUINE 85838008 is listed in this group.

This table covers the CV Intermediate shafts. Read more

2 CV Intermediate Shaft parts for the 2021 GMC Sierra 1500 come from 2 brands — GSP and TOP NOTCH.

Part numbers include GSP NEX10003 and TOP NOTCH TN20132IS.

This table covers the constant-velocity joints at each end of a drive axle. Read more

GM GENUINE supplies the 3 CV Joint parts for the 2021 GMC Sierra 1500.

This group includes GM GENUINE 22928970, GM GENUINE 85643849 and GM GENUINE 87842369.

This table covers the boots that keep grease in a CV joint. Typical signs include a split boot, grease flung around the joint, or a click once grit is inside. A boot caught early is a kit. Once the joint has clicked, the joint itself is usually worn. Read more

8 CV Joint Boot parts are listed for the 2021 GMC Sierra 1500, from GM GENUINE and AAM. AAM 40215887 carries the "Popular" badge.

This group includes AAM 40215887, GM GENUINE 22983109 and GM GENUINE 27172764 and the remaining parts above.

This table covers the bands that clamp a CV boot to the joint. Read more

5 CV Joint Boot Band parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 11603287, GM GENUINE 11603288 and GM GENUINE 11605536, plus the other parts above.

This table covers the CV Joint Lock rings. Read more

2 CV Joint Lock Ring parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 23369006 and GM GENUINE 07849284.

This table covers the carriers that hold the differential gears in the axle. Read more

5 Differential Carrier parts are listed for the 2021 GMC Sierra 1500, from GM GENUINE, USA STANDARD GEAR and AAM. AAM 40090727 carries the "Popular" badge.

The Heavy Duty section lists 1 option from USA STANDARD GEAR — rated for severe service. USA STANDARD GEAR USA26049 is listed in this group.

The Standard Replacement section: 3 options from GM GENUINE and AAM. AAM 40090727 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

Part numbers include AAM 40090727, USA STANDARD GEAR USA26049 and GM GENUINE 22943118, among others listed above.

This table covers the bearings and races that support the differential carrier. Read more

5 Differential Carrier Bearing / Race parts are listed for the 2021 GMC Sierra 1500, from GM GENUINE and TIMKEN. TIMKEN LM501349 carries the "Popular" badge.

Part numbers include TIMKEN LM501349, GM GENUINE 85722139 and GM GENUINE 84766413, among others listed above.

This table covers the Differential Carrier bolts. Read more

3 Differential Carrier Bolt parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 11561300, GM GENUINE 11548870 and GM GENUINE 11603283.

This table covers the Differential Carrier bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles. Read more

GM GENUINE supplies the 4 Differential Carrier Bushing parts for the 2021 GMC Sierra 1500.

Listed part numbers: GM GENUINE 23243748, GM GENUINE 23280848 and GM GENUINE 85644582, plus the other parts above.

This table covers the Differential Carrier shims. Read more

8 Differential Carrier Shim parts for the 2021 GMC Sierra 1500 come from GM GENUINE. The "Popular" part is GM GENUINE 15599629.

Part numbers include GM GENUINE 15599629, GM GENUINE 22835276 and GM GENUINE 84459298, among others listed above.

This table covers the clutch packs in a limited-slip or locking differential. Read more

GM GENUINE supplies both parts for the 2021 GMC Sierra 1500.

Part numbers include GM GENUINE 23404635 and GM GENUINE 84446266.

This table covers the Differential Clutch Pack clips. Read more

GM GENUINE supplies both parts for the 2021 GMC Sierra 1500.

Part numbers include GM GENUINE 15599623 and GM GENUINE 12471533.

This table covers the Differential covers. Read more

5 Differential Cover parts for the 2021 GMC Sierra 1500 come from 4 brands — GM GENUINE, USA STANDARD GEAR, AAM and 1 other brand. The "Popular" part is USA STANDARD GEAR USA32365.

This group includes USA STANDARD GEAR USA32365, AAM 40182934 and DORMAN 697496 and the remaining parts above.

This table covers the Differential Cover bolts. Read more

GM GENUINE supplies both parts for the 2021 GMC Sierra 1500.

Part numbers include GM GENUINE 11602538 and GM GENUINE 11546347.

This table covers the gaskets that seal the Differential Cover. 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

7 Differential Cover Gasket parts are listed for the 2021 GMC Sierra 1500, from GM GENUINE, AAM, DORMAN and 1 other brand. GM GENUINE 85720902 carries the "Popular" badge.

Part numbers include GM GENUINE 85720902, GM GENUINE 84428297 and AAM 40270026, among others listed above.