2003 Hummer H1 Automatic Transmission Parts

This table covers the Actuator Feed Limit 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

TRANSGO supplies both parts for the 2003 Hummer H1.

This group includes TRANSGO 48ACTVL6 and TRANSGO 48ACTTL.

This table covers the apply bands inside the automatic transmission. Read more

5 Band parts for the 2003 Hummer H1 come from 3 brands — ATP, PIONEER and BORG-WARNER. The "Popular" part is BORG-WARNER 38014BW.

This group includes BORG-WARNER 38014BW, ATP JX60 and ATP TPB1060 and the remaining parts above.

This table covers the Boost 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

This group shows a single part: SONNAX 4L80ELB1.

This table covers the bushings in this assembly. 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

2 Bushing parts are listed for the 2003 Hummer H1, from DURA-BOND and PIONEER.

Listed part numbers: DURA-BOND GMT42 and PIONEER 755189.

This table covers the Bushing kits. Read more

5 Bushing Kit parts are listed for the 2003 Hummer H1, from DURA-BOND, PIONEER and ATP. PIONEER 754032 carries the "Popular" badge.

This group includes PIONEER 754032, ATP TBK1050 and DURA-BOND TK4A and the remaining parts above.

This table covers the Case 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

2 Case Bushing parts are listed for the 2003 Hummer H1, from DURA-BOND and SONNAX.

Listed part numbers: DURA-BOND GMT44 and SONNAX 34006SPB.

This table covers the Center Support 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

One part is listed for the 2003 Hummer H1 — DURA-BOND 03118.

This table covers the Clutch hubs. Read more

One part is listed for the 2003 Hummer H1 — SONNAX 3432202K.

This table covers the clutch-plate packs inside the transmission or transfer case. Read more

RAYBESTOS POWERTRAIN supplies the 4 Clutch Plate Pack parts for the 2003 Hummer H1.

The Friction Plate Pack section lists 2 options from RAYBESTOS POWERTRAIN — grouped under the catalog's "Friction Plate Pack" designation — the notes column spells out what sets them apart. RAYBESTOS POWERTRAIN RCP96075 is listed in this group.

In the Steel Plate Pack grade, RAYBESTOS POWERTRAIN supplies 2 parts: grouped under the catalog's "Steel Plate Pack" designation — the notes column spells out what sets them apart. A representative part number is RAYBESTOS POWERTRAIN 000581.

This group includes RAYBESTOS POWERTRAIN RCP96075, RAYBESTOS POWERTRAIN RCPS36 and RAYBESTOS POWERTRAIN 000581 and the remaining parts above.

This table covers the related components grouped with this assembly. Read more

SONNAX supplies the 8 Components parts for the 2003 Hummer H1. SONNAX 3499801K carries the "Popular" badge.

Listed part numbers: SONNAX 3499801K, SONNAX 3420047K and SONNAX 3471601, plus the other parts above.

This table covers the Extension Housing 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

4 Extension Housing Bushing parts are listed for the 2003 Hummer H1, from DURA-BOND and PIONEER.

This group includes DURA-BOND 34005F, DURA-BOND 34066EXBR and DURA-BOND GMT45 and the remaining parts above.

This table covers the gaskets that seal the Extension Housing. 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

2 Extension Housing Gasket parts for the 2003 Hummer H1 come from PIONEER.

Part numbers include PIONEER 749296 and PIONEER 749295.

This table covers the seals at the Extension 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

14 Extension Housing Seal parts for the 2003 Hummer H1 come from 7 brands — NATIONAL, WJB / INMOTION PARTS, SCHAEFFLER and 4 other brands. The "Popular" part is ACDELCO 4333N.

This table covers the replacement filters for this application — the table heading and notes say which circuit. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for. Read more

10 Filter parts are listed for the 2003 Hummer H1, from ATP, CHAMP / LUBER-FINER, VARIOUS MFR and 4 other brands. ATP B174 carries the "Popular" badge.

In the Economy grade, ATP, CHAMP / LUBER-FINER and VARIOUS MFR supply 3 parts: the catalog's value-priced group. A representative part number is ATP TF174.

The Standard Replacement section lists 7 options from ATP, WIX, ACDELCO and 2 other brands — built to original-equipment specification. ATP B174 is listed in this group.

This table covers the flexplates that connect the crankshaft to the torque converter. Read more

2 Flexplate parts for the 2003 Hummer H1 come from 2 brands — ATP and PIONEER.

Listed part numbers: ATP Z136 and PIONEER FRA142.

This table covers the gaskets that seal the Fluid Pan. 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 Fluid Pan Gasket parts are listed for the 2003 Hummer H1, from ATP, FEL-PRO, MAHLE / CLEVITE and 2 other brands. ATP JG142 carries the "Popular" badge.

Listed part numbers: ATP JG142, FEL-PRO TOS18698 and MAHLE / CLEVITE W39379, plus the other parts above.

This table covers the Fluid Pump 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

6 Fluid Pump Bushing parts are listed for the 2003 Hummer H1, from DURA-BOND and PIONEER. DURA-BOND 34001CSTG carries the "Popular" badge.

This group includes DURA-BOND 34001CSTG, DURA-BOND 34001CT and DURA-BOND 34001C and the remaining parts above.

This table covers the gaskets that seal the Fluid 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

2 Fluid Pump Gasket parts for the 2003 Hummer H1 come from 2 brands — ATP and PIONEER.

Listed part numbers: ATP SG47 and PIONEER 749361.

This table covers the precision wear sleeves used to restore a transmission pump seal surface. Read more

2 Fluid Pump Repair Sleeve parts for the 2003 Hummer H1 come from 2 brands — NATIONAL and WJB / INMOTION PARTS.

Listed part numbers: NATIONAL 99199 and WJB / INMOTION PARTS WS99199.

This table covers the seals at the Fluid Pump. 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 Fluid Pump Seal parts for the 2003 Hummer H1 come from 4 brands — NATIONAL, BCA, ATP and 1 other brand. The "Popular" part is NATIONAL 714598.

This group includes NATIONAL 714598, NATIONAL 341022 and ATP JO122 and the remaining parts above.

This table covers the Fluid temperature sensors. Typical signs include hard cold starts, a fan that never comes on, or a gauge that disagrees with the scan tool. A sensor that reads open or shorted is usually the part; an implausible-but-smooth reading can be wiring. Read more

One part is listed for the 2003 Hummer H1 — PIONEER 771090.

This table covers the governors and modulators that control transmission shift pressure. Read more

One part is listed for the 2003 Hummer H1 — TRANSGO 48MOD.

This table covers the Main shafts. Read more

This group shows a single part: SONNAX 3467205.

This table covers the seals at the Manual 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 Manual Shaft Seal parts for the 2003 Hummer H1 come from 2 brands — NATIONAL and WJB / INMOTION PARTS.

Part numbers include NATIONAL 8792S and WJB / INMOTION PARTS WS8792S.

This table covers the Output Shaft 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

This group shows a single part: DURA-BOND 8624988.

This table covers the seals at the Output 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

One part is listed for the 2003 Hummer H1 — SCHAEFFLER SS2962.

This table covers the Pressure Control (EPC) 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

2 Pressure Control (EPC) Solenoid parts are listed for the 2003 Hummer H1, from PA CARGO and ROSTRA.

This group includes PA CARGO 34605A and ROSTRA 520340.

This table covers the Pressure Switch 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

3 Pressure Switch Manifold parts for the 2003 Hummer H1 come from 3 brands — ATP, PIONEER and ROSTRA.

Part numbers include ATP JE10, PIONEER 772014 and ROSTRA 501000.

This table covers the rebuild kits for this assembly. Read more

12 Rebuild Kit parts for the 2003 Hummer H1 come from 4 brands — PIONEER, PA CARGO, ATP and 1 other brand. The "Popular" part is PA CARGO DK3400GS.

The Banner Kit (Overhaul Kit + Friction Clutch Plates) section lists 1 option from PA CARGO — grouped under the catalog's "Banner Kit (Overhaul Kit + Friction Clutch Plates)" designation — the notes column spells out what sets them apart. PA CARGO DK3400GS is listed in this group.

The Deluxe Kit (Master Kit + Filter, Band & Common Bushings) section lists 2 options from PIONEER — grouped under the catalog's "Deluxe Kit (Master Kit + Filter, Band & Common Bushings)" designation — the notes column spells out what sets them apart. PIONEER 753060 is listed in this group.

In the Master Kit (Overhaul Kit + Friction & Steel Clutch Plates) grade, ATP, PIONEER and PA CARGO supply 5 parts: grouped under the catalog's "Master Kit (Overhaul Kit + Friction & Steel Clutch Plates)" designation — the notes column spells out what sets them apart. A representative part number is PA CARGO DK3400G.

The Overhaul Kit (Gaskets, Seals, O-Rings & Sealing Rings) section lists 4 options from TRANSTEC, PA CARGO and PIONEER — grouped under the catalog's "Overhaul Kit (Gaskets, Seals, O-Rings & Sealing Rings)" designation — the notes column spells out what sets them apart. PA CARGO K34900G is listed in this group.

This table covers the sealing rings inside this assembly. Read more

One part is listed for the 2003 Hummer H1 — TRANSGO 4L80EHTRK.

This table covers the Shift Improvement kits. Read more

TRANSGO supplies the 3 Shift Improvement Kit parts for the 2003 Hummer H1.

The Daily Driver section lists 1 option from TRANSGO — grouped for everyday commuting duty. TRANSGO SK4L80E is listed in this group.

In the High Performance grade, TRANSGO supplies 2 parts: engineered beyond original-equipment specification. A representative part number is TRANSGO 4L80EHD2.

Part numbers include TRANSGO SK4L80E, TRANSGO 4L80EHD2 and TRANSGO 4L80E3.

This table covers the seals at the Shift 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 Shift Shaft Seal parts for the 2003 Hummer H1 come from 2 brands — ACDELCO and SCHAEFFLER.

This group includes ACDELCO 8792S and SCHAEFFLER SS2114.

This table covers the Shift 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

3 Shift Solenoid parts for the 2003 Hummer H1 come from 3 brands — ROSTRA, PIONEER and ATP.

In the Single Solenoid grade, ROSTRA supplies 1 part: grouped under the catalog's "Single Solenoid" designation — the notes column spells out what sets them apart. A representative part number is ROSTRA 520356.

In the Solenoid Pack / Kit grade, PIONEER supplies 1 part: grouped under the catalog's "Solenoid Pack / Kit" designation — the notes column spells out what sets them apart. A representative part number is PIONEER 771040.

1 further part sits outside the graded sections, with the same engine-level match.

Part numbers include ROSTRA 520356, PIONEER 771040 and ATP JE53.

This table covers the Stator Support Shaft 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

DURA-BOND supplies the 3 Stator Support Shaft Bushing parts for the 2003 Hummer H1.

Part numbers include DURA-BOND GMT41, DURA-BOND 8661614 and DURA-BOND GMT41A.

This table covers the Sun Gear 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

2 Sun Gear Bushing parts for the 2003 Hummer H1 come from DURA-BOND.

Part numbers include DURA-BOND 03131BRS and DURA-BOND 03131.

This table covers the Torque converters. Typical signs include a sulfur smell, rattling substrate, or an efficiency code. Confirm CARB vs Federal certification in the notes before ordering. Read more

One part is listed for the 2003 Hummer H1 — TC REMANUFACTURING B81NS.

This table covers the Torque Converter Clutch 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

2 Torque Converter Clutch Solenoid parts are listed for the 2003 Hummer H1, from PIONEER and ROSTRA.

Listed part numbers: PIONEER 771021 and ROSTRA 520241.

This table covers the Torque Converter Clutch 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

2 Torque Converter Clutch Valve parts for the 2003 Hummer H1 come from TRANSGO.

Part numbers include TRANSGO 4L80ETCC and TRANSGO 48CCV.

This table covers the wear sleeves used to restore a Torque Converter seal surface. Read more

This group shows a single part: SCHAEFFLER SR3511.

This table covers the automatic-transmission fluids specified for this gearbox. Typical signs include harsh or delayed shifts, fluid that smells burnt, or a shudder at light throttle. Use exactly the specification in the notes. Automatic transmissions are unforgiving of the wrong fluid. Read more

20 Transmission Fluid parts are listed for the 2003 Hummer H1, from VALVOLINE, ACDELCO, LIQUI MOLY and 2 other brands. ACDELCO 109243 carries the "Popular" badge.

In the Dexron grade, VALVOLINE and ACDELCO supply 6 parts: grouped under the catalog's "Dexron" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 109243.

In the Mercon grade, VALVOLINE supplies 1 part: grouped under the catalog's "Mercon" designation — the notes column spells out what sets them apart. A representative part number is VALVOLINE 822345.

In the Multi-Vehicle grade, VALVOLINE and LIQUI MOLY supply 7 parts: grouped under the catalog's "Multi-Vehicle" designation — the notes column spells out what sets them apart. A representative part number is VALVOLINE VV3246.

In the Type III (H) grade, ACDELCO supplies 2 parts: grouped under the catalog's "Type III (H)" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 109240.

In the Type T-4 (Type T-IV) grade, IDEMITSU supplies 2 parts: grouped under the catalog's "Type T-4 (Type T-IV)" designation — the notes column spells out what sets them apart. A representative part number is IDEMITSU 30040093750.

In the ZF Fluid grade, ZF supplies 1 part: grouped under the catalog's "ZF Fluid" designation — the notes column spells out what sets them apart. A representative part number is ZF 5961308623.

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

This table covers the conditioners and additives used with this transmission fluid. Read more

8 Transmission Fluid Additive parts are listed for the 2003 Hummer H1, from LUBEGARD and ATP. LUBEGARD 19610 carries the "Popular" badge.

Listed part numbers: LUBEGARD 19610, LUBEGARD 60902 and ATP AT202, plus the other parts above.

This table covers the valve bodies that route hydraulic pressure inside the transmission. Read more

3 Valve Body parts are listed for the 2003 Hummer H1, from SONNAX and PA CARGO.

Part numbers include PA CARGO GM4624B, SONNAX GM028 and SONNAX GM033.

This table covers the gaskets that seal the Valve Body. 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: TRANSTEC 72401472.

This table covers the Valve Body Separator 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

This group shows a single part: TRANSGO 48PLT01.

This table covers the testers used to diagnose a valve body. Read more

One part is listed for the 2003 Hummer H1 — SONNAX 34994VTP.