transmission

Transmission Input Shaft Bearing

for 1972 Ford F-100 302ci V8 · RWD

Difficulty

Expert

Time

10.2 h

Tools

Steps

🤖AI-drafted, AI fact-checked. An independent second model reviewed this procedure line by line and its corrections have been applied. Final sign-off by Chris Hackleman & Jeff Moore is still pending. Cross-check torque values against the factory manual, and stop if anything looks unsafe.

This procedure involves removing the transmission to replace the input shaft bearing, which requires driveshaft removal, transmission support, and complete transmission disassembly to access the bearing.

Warnings

⚠️Vehicle must be supported on jack stands rated for the vehicle weight. Never work under a vehicle supported only by a floor jack.

⚠️Transmission weighs approximately 150-180 pounds. Use proper lifting equipment and techniques to prevent serious injury.

⚠Transmission fluid will drain when components are removed. Have adequate drain pans positioned to catch fluid.

⚠Mark all components during disassembly to ensure correct reassembly orientation. Improper reassembly will cause transmission failure.

ℹ️This procedure assumes either a C4 or FMX automatic transmission. Verify transmission type before beginning work as internal differences exist.

Tools required

Transmission jackEssential

Engine support bar or hoistEssential

Jack stands (minimum 4-ton capacity)Essential

Floor jackEssential

Bearing puller setEssential

Bearing installation tool or driver setEssential

Torque wrench (ft-lb range)Essential

Inch-pound torque wrenchEssential

Socket set (standard and deep)

Combination wrench set

Pry bar

Oil drain pan (large capacity)Essential

Seal driver set

Dial indicator with magnetic base

Transmission pump holding tool

C-frame press or hydraulic pressEssential

Snap ring pliers (internal and external)Essential

Brass drift punch set

Transmission assembly lubeEssential

Parts cleaning solvent and brushes

Marking pen or paint

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Parts

Transmission input shaft bearing × 1 — Use OEM specification for C4 or FMX transmission
Transmission front pump seal × 1 — Use OEM specification
Transmission front pump O-ring × 1 — Use OEM specification
Transmission pan gasket × 1 — Use OEM specification
Driveshaft U-joint strap bolts × 4 — Use OEM specification
Transmission filter × 1 — Use OEM specification
RTV silicone sealant (transmission safe) × 1 — High-temp transmission RTV

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Fluids

Type F ATF — 11 qt

Preparation

Disconnect negative battery cable
Raise vehicle and support securely on jack stands at frame rails
Position drain pan under transmission and drain fluid by removing pan
Remove transmission pan and filter to allow complete drainage
Mark driveshaft and rear axle yoke relationship for proper reassembly alignment
Support engine using engine support bar across fender rails or chain hoist from above
Clean work area and transmission exterior with degreaser to prevent contamination during disassembly

Procedure

1
Remove driveshaft
Mark relationship between driveshaft and rear axle yoke. Remove the 4 U-joint strap bolts at the rear axle. Slide driveshaft rearward to disengage from transmission output shaft. Plug transmission extension housing with clean rag to prevent fluid leakage and contamination.
2
Disconnect shift linkage and cables
Disconnect shift linkage rod from transmission shift lever. Remove kickdown linkage rod from throttle valve lever on transmission case. On models with column shift, disconnect shift column linkage at transmission. Tag all connections for proper reassembly.
3
Disconnect electrical and cooler lines
Disconnect neutral safety switch connector from transmission. Disconnect transmission cooler lines at transmission fittings using flare nut wrench. Cap or plug lines and fittings immediately to prevent contamination. Position lines aside.
4
Remove transmission crossmember
Position transmission jack under transmission pan. Remove the 2 transmission mount-to-crossmember bolts. Remove the 4 crossmember-to-frame bolts. Lower transmission jack slightly and remove crossmember from vehicle.
5
Remove transmission-to-engine bolts
Remove the 6 transmission bellhousing-to-engine block bolts. Note: Upper bolts may require universal joint socket or extension for access. Mark torque converter relationship to flexplate before separation if not already marked.
6
Remove transmission from vehicle
Carefully slide transmission rearward away from engine, ensuring torque converter remains fully engaged in transmission pump (approximately 3/4 inch forward of bellhousing face). Guide transmission down and rearward out from under vehicle. Install torque converter holding tool or secure with wire to prevent it from falling out during handling.
⚠️Transmission weighs 150-180 pounds. Ensure transmission jack is secure and have helper assist with removal.
7
Remove torque converter
With transmission on workbench, remove torque converter holding tool. Slide torque converter forward out of transmission. Drain remaining fluid from converter into pan. Set converter aside on clean surface.
8
Remove front pump assembly
Remove the front pump retaining bolts from front of transmission case (typically 5 bolts on C4, verify for FMX). Use slide hammer or pry bars to carefully extract pump assembly straight out of case. The input shaft bearing is located inside the pump body behind the stator support.
⚠Do not damage aluminum pump body or transmission case sealing surfaces. Pry gently and evenly.
9
Disassemble front pump
Place pump assembly on clean workbench with front side down. Remove snap ring retaining stator support to pump body. Remove the 5 stator support-to-pump body bolts. Carefully separate stator support from pump body. The input shaft bearing will be visible on the stator support hub.
10
Remove old input shaft bearing
Using appropriate bearing puller, carefully remove input shaft bearing from stator support hub. Position puller jaws behind bearing inner race and pull bearing straight off hub. Inspect stator support hub surface for scoring, wear, or damage. Clean hub thoroughly with solvent and allow to dry.
⚠Do not damage stator support hub surface. Use proper bearing puller with even pressure to prevent cocking or binding.
11
Install new input shaft bearing
Apply thin coat of transmission assembly lube to stator support hub. Position new bearing on hub with manufacturer markings facing outward. Using bearing installation tool or appropriately sized driver, press bearing onto hub until it seats against shoulder. Apply pressure only to bearing inner race, never to outer race or cage. Verify bearing rotates smoothly without binding.
12
Reassemble front pump
Install new O-ring in groove on pump body outer diameter. Apply thin coat of transmission assembly lube to O-ring and all sealing surfaces. Install stator support into pump body, aligning bolt holes. Install the 5 stator support bolts and tighten in star pattern to secure. Install snap ring in groove to retain stator support.
13
Install front pump seal
Remove old front pump seal from pump body using seal puller or carefully prying out. Clean seal bore thoroughly. Apply thin coat of transmission assembly lube to new seal outer diameter and lip. Using seal driver, install new front pump seal into pump body with lip facing inward. Drive seal in squarely until flush with or slightly below pump face.
14
Install pump assembly into transmission
Inspect transmission case pump bore for damage or debris. Apply thin coat of transmission assembly lube to pump O-ring and case bore. Carefully align pump assembly with case and slide pump into case, rotating pump slightly to engage with clutch components inside. Pump should slide in approximately 1/2 inch, then stop at clutch engagement. Install the 6 pump retaining bolts and tighten in star pattern.
15
Verify input shaft endplay
If available, mount dial indicator on front of pump with tip contacting input shaft. Using screwdriver through pump, pry input shaft forward and zero dial indicator. Pull input shaft rearward and note endplay reading. Typical specification is 0.008-0.042 inch. Record measurement. If endplay is excessive, investigate cause before reinstalling transmission.
ℹ️Endplay verification is optional but recommended to confirm proper bearing installation and clutch pack condition.

Reassembly

Install torque converter into transmission, ensuring it engages pump drive, forward clutch splines, and stator support (approximately 3/4 inch forward of bellhousing face)
Position transmission on transmission jack and align with engine
Slide transmission forward onto engine, guiding torque converter into flexplate/flywheel pilot
Install the 6 transmission-to-engine bolts and tighten in star pattern
Install transmission crossmember and tighten the 4 frame bolts, then the 2 mount-to-crossmember bolts
Remove transmission jack and engine support
Reconnect transmission cooler lines using new sealing washers if equipped
Reconnect neutral safety switch connector
Reconnect shift linkage and kickdown linkage to original positions
Align driveshaft-to-yoke marks and install the 4 U-joint strap bolts
Install new transmission filter and pan with new gasket
Lower vehicle and fill transmission with 11 quarts of Type F ATF through dipstick tube
Reconnect negative battery cable

Verification

Start engine and verify transmission shifts through all gears smoothly with no abnormal noise
Check transmission fluid level with engine at operating temperature and in Park position, adjust if necessary
Test drive vehicle through all gear ranges and verify smooth shifting with no slipping or binding
Verify no fluid leaks from pan, cooler lines, front pump seal, or any connections
Recheck fluid level after test drive and top off if needed
Verify neutral safety switch operation (engine should only start in Park or Neutral)

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