Transmission Output Shaft Bearing

This procedure covers the replacement of the transmission output shaft bearing, requiring complete transmission removal from the vehicle and partial disassembly of the transmission housing.

Warnings

Tools required

Parts

• Output shaft bearing × 1 — Use OEM specification
• Transmission rear seal × 1 — Use OEM specification
• Extension housing gasket or RTV sealant × 1 — AC Delco 88861008 or equivalent
• Transmission pan gasket × 1 — Use OEM specification
• Transmission filter × 1 — AC Delco 24277652
• Transmission drain plug washer × 1 — If equipped with drain plug
• Crossmember mounting hardware × 1 — Replace if corroded

Fluids

• ACDelco Dexron VI ATF — 11.5 qt

Preparation

1. Raise vehicle on a lift or support securely on jack stands at all four corners, providing adequate working clearance underneath
2. Disconnect negative battery cable and secure away from terminal
3. Remove driveshaft and mark relationship between shaft and rear differential flange for reinstallation
4. Disconnect shift linkage at transmission
5. Disconnect electrical connectors from transmission (harness, speed sensors, solenoid pack)
6. Remove exhaust system from catalytic converters rearward to provide clearance
7. Install engine support fixture or support engine from above with hoist to prevent engine dropping when crossmember is removed
8. Place transmission drain pan under transmission pan

Procedure

1. 1

   Drain transmission fluid
   If equipped with drain plug, remove drain plug and drain fluid into appropriate container. If no drain plug is present, loosen all transmission pan bolts and carefully break the seal at the rear of the pan, allowing fluid to drain. Once drained, remove pan bolts completely and lower pan. Remove and discard transmission filter.
   Torque spec

   Drain Plug42 Nm (31 lb-ft)

   Pan Bolts20 Nm (15 lb-ft)
2. 2

   Remove transmission cooler lines
   Disconnect transmission cooler lines at the transmission using appropriate line disconnect tools. Cap or plug all openings immediately to prevent contamination and fluid loss. Remove any brackets securing cooler lines to transmission.
3. 3

   Support and remove transmission crossmember
   Position transmission jack under transmission pan with wood block to distribute load. Raise jack slightly to support transmission weight. Remove crossmember mounting bolts from frame. Remove transmission mount bolts from crossmember. Carefully lower crossmember and set aside.
   Torque spec

   Mounting Bolts76 Nm (56 lb-ft)
4. 4

   Separate transmission from engine
   Remove bellhousing bolts securing transmission to engine block. Verify all electrical connections, cooler lines, and linkages are disconnected. Carefully slide transmission rearward on jack, ensuring torque converter remains with transmission. Once input shaft clears engine, carefully lower transmission and move clear of vehicle.
   ⚠Keep transmission level during removal to prevent torque converter from sliding out. If converter begins to disengage, secure with transmission holding strap.
5. 5

   Remove extension housing
   With transmission on workbench in horizontal position, remove all extension housing bolts. Note bolt locations as they may be different lengths. Carefully pry extension housing from transmission case using appropriate pry points. Remove and discard housing gasket or clean old RTV completely.
   Torque spec

   Cover Screws14 Nm (10 lb-ft)
6. 6

   Remove output shaft rear seal
   Using seal puller or appropriate tool, remove output shaft rear seal from extension housing. Inspect housing bore for damage, scoring, or excessive wear. Clean housing thoroughly and inspect for cracks.
7. 7

   Remove output shaft assembly
   Depending on internal configuration, you may need to remove the output shaft assembly to access the bearing. Note position and orientation of all components. Remove snap rings or retaining clips securing output shaft in case. Carefully slide output shaft assembly rearward and out of transmission case.
   ⚠Keep all removed components organized and in order for proper reassembly. Take photographs if necessary to document component positions.
8. 8

   Remove output shaft bearing
   Using appropriate bearing puller attached to slide hammer, position puller fingers behind bearing race. Apply steady pulling force to extract bearing from housing or shaft (depending on bearing location). If bearing is pressed into case, use internal bearing puller. Inspect bearing bore in case or housing for damage, scoring, or discoloration indicating overheating.
   ⚠Do not strike bearing directly with hammer or punch as this will damage the case or housing bore.
9. 9

   Install new output shaft bearing
   Clean bearing bore thoroughly with solvent and lint-free cloth. Verify new bearing matches old bearing exactly. Place new bearing squarely in bore with manufacturer marking facing outward. Using appropriate bearing driver matching bearing outer race diameter, drive bearing into bore until fully seated against shoulder. Bearing should be driven evenly to prevent cocking. Verify bearing is fully seated and rotates smoothly.
   ⚠Apply driving force only to bearing outer race, never to inner race, cage, or rolling elements.
10. 10

    Reinstall output shaft assembly
    Lubricate output shaft bearing with Dexron VI ATF. Carefully install output shaft assembly into transmission case, ensuring proper engagement with internal components. Install retaining snap rings or clips. Verify shaft rotates freely without binding and has correct end play per manufacturer specifications (typically 0.003-0.030 inches).
11. 11

    Install new rear seal and extension housing
    Install new output shaft seal into extension housing using appropriate seal driver, with seal lip facing inward toward transmission. Apply thin bead of RTV sealant to extension housing mating surface if RTV is specified, or install new gasket. Carefully install extension housing over output shaft, ensuring seal is not damaged during installation. Install all housing bolts and tighten in criss-cross pattern.
    Torque spec

    Cover Screws14 Nm (10 lb-ft)
12. 12

    Reinstall transmission into vehicle
    Position transmission on transmission jack and raise into position. Ensure torque converter is fully seated in transmission pump (measure to verify converter ears are approximately 0.5 inches behind bellhousing face). Align transmission with engine and carefully slide forward, ensuring torque converter hub engages with crankshaft. Install all bellhousing bolts and tighten evenly. Do not force transmission into place by tightening bolts.
13. 13

    Install crossmember and mount
    Raise transmission slightly with jack. Position crossmember and install crossmember-to-frame bolts. Install transmission mount-to-crossmember bolts. Tighten all mounting hardware.
    Torque spec

    Mounting Bolts76 Nm (56 lb-ft)
14. 14

    Reconnect all components
    Reconnect transmission cooler lines and secure brackets. Reconnect all electrical connectors ensuring they click into place. Reconnect shift linkage and verify proper operation through all gear positions. Install driveshaft aligning marks made during removal. Install exhaust system. Install new transmission filter. Install transmission pan with new gasket, tightening bolts in criss-cross pattern.
    Torque spec

    Pan Bolts20 Nm (15 lb-ft)
15. 15

    Fill transmission with fluid
    Using transmission fluid pump, add approximately 5 quarts of Dexron VI ATF through dipstick tube or fill plug. Start engine and allow to idle. Move shift lever through all gear positions, pausing in each position. With engine running and transmission in Park, check fluid level and add fluid to bring level to cold range on dipstick. Recheck fluid level after transmission reaches operating temperature and adjust as necessary to bring level to hot range.
    Torque spec

    Fill Plug42 Nm (31 lb-ft)

Reassembly

1. Reconnect negative battery cable after all systems are verified
2. Verify all fasteners are tightened to specification and no tools or parts are left in engine bay
3. Check for fluid leaks around extension housing, pan, and cooler line connections after initial start
4. Road test vehicle through all gears and verify smooth operation with no abnormal noises

Verification

• Start engine and verify no transmission fluid leaks at pan, extension housing, or cooler lines
• Check transmission fluid level with engine at operating temperature and adjust if necessary
• Test drive vehicle and verify smooth shifting through all gears with no abnormal noises, vibrations, or binding
• Listen specifically for bearing noise (grinding, whirring, or humming) during acceleration and deceleration
• Verify proper engagement of Park pawl and all gear selections
• Recheck fluid level after test drive and top off if necessary
• Inspect underneath vehicle for any fluid leaks after test drive

Related trouble codes on this vehicle

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