transmission

Pilot Bearing

for 1972 Ford F-100 302ci V8 · RWD

Difficulty

Advanced

Time

7.8 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.

Replace the pilot bearing (or bushing) located in the rear of the crankshaft that supports the input shaft of the manual transmission.

Warnings

⚠️Support vehicle with jack stands rated for the vehicle weight. Never work under a vehicle supported only by a floor jack.

⚠The transmission weighs approximately 120-150 lbs. Use a transmission jack and have an assistant available.

⚠Mark the driveshaft and axle yoke orientation before removal to maintain driveline balance.

⚠Do not allow the transmission input shaft to hang unsupported on the clutch disc during removal.

ℹ️This is an ideal time to replace the clutch assembly, throwout bearing, and inspect the flywheel if mileage or condition warrants.

Tools required

Floor jackEssential

Jack standsEssential

Transmission jackEssential

Pilot bearing puller or slide hammer with internal puller attachmentEssential

Pilot bearing installation tool or appropriately sized socketEssential

Socket set (3/8" and 1/2" drive)Essential

Combination wrench setEssential

Torque wrenchEssential

Clutch alignment toolEssential

Pry bar

Impact wrench

Penetrating oil

Clean ragsEssential

Parts cleaning solvent

Small bearing greaseEssential

Wire brush

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

Parts

Pilot bearing or bushing × 1 — Use OEM specification for 302 V8
Clutch disc × 1 — Recommend replacement during this service
Pressure plate × 1 — Recommend replacement during this service
Throwout bearing × 1 — Recommend replacement during this service
Transmission input shaft seal × 1 — Recommend replacement during this service
Rear main seal × 1 — Inspect and replace if leaking

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

Fluids

80W-90 GL-5 — 3.5 qt

Preparation

Park vehicle on level ground and apply parking brake
Disconnect negative battery cable
Raise vehicle and support securely on jack stands at frame rails
Allow exhaust system to cool completely if vehicle was recently driven
Drain transmission fluid into suitable container if planning to service transmission seals

Procedure

1
Remove driveshaft
Mark the relationship between the rear driveshaft yoke and the differential pinion yoke with paint or a scribe. Remove the 4 U-joint strap bolts at the rear axle. Slide the driveshaft rearward to disengage from the transmission output shaft, then lower and remove from vehicle. Stuff a clean rag in the transmission tailshaft to prevent fluid loss.
2
Disconnect clutch linkage
Disconnect the clutch return spring from the clutch fork. Remove the clutch rod from the clutch fork by removing the retaining clip or cotter pin. On vehicles with mechanical linkage, disconnect the cross-shaft assembly at the frame bracket if necessary for clearance.
3
Disconnect electrical and mechanical connections
Disconnect the backup light switch electrical connector on the driver side of the transmission. Disconnect the speedometer cable from the transmission tailshaft housing by unscrewing the retaining collar. Tag any ground straps attached to the transmission or bellhousing for proper reinstallation.
4
Support transmission
Position a transmission jack under the transmission pan and raise slightly to support the weight. Place a block of wood between the jack and pan to distribute load evenly. Adjust jack height so transmission is level and just touching support point.
5
Remove transmission crossmember
Remove the 2 bolts securing the transmission mount to the crossmember. Remove the 4 bolts securing the crossmember to the frame rails (2 per side). Lower the transmission jack slightly and remove the crossmember from the vehicle.
6
Remove bellhousing bolts
Remove the 4 bellhousing-to-engine block bolts. Access the upper bolts from the engine compartment and the lower bolts from underneath. Note the location of any ground straps or wiring harness brackets attached to these bolts for reinstallation.
7
Remove transmission
With an assistant supporting the transmission or using adequate transmission jack capacity, carefully slide the transmission straight rearward to disengage the input shaft from the clutch disc and pilot bearing. Keep the transmission level and avoid letting the input shaft bind or hang on the clutch disc. Once the input shaft clears the bellhousing, lower the transmission jack and roll it out from under the vehicle.
8
Remove clutch assembly
Mark the pressure plate orientation to the flywheel with a paint marker. Using a clutch alignment tool or spare input shaft to support the clutch disc, remove the 6 pressure plate bolts in a crisscross pattern, loosening each 2-3 turns at a time to prevent warping. Remove the pressure plate and clutch disc together. Inspect the flywheel for heat checking, cracks, or excessive wear.
9
Inspect and clean crankshaft pilot bore
Inspect the pilot bearing bore in the rear of the crankshaft. Clean any old grease or debris from the area using solvent and a clean rag. Examine the old bearing or bushing condition to determine failure mode.
10
Remove old pilot bearing
Use a pilot bearing puller or slide hammer with internal puller attachment to remove the old bearing. If a puller is unavailable, carefully pack the cavity behind the bearing with heavy grease and use a close-fitting shaft (old input shaft or appropriately sized rod) to hydraulically force the bearing out by compressing the grease. Apply steady, firm pressure. Avoid damaging the crankshaft bore.
11
Install new pilot bearing
Pack the new pilot bearing with high-temperature bearing grease (do not over-pack). Position the bearing squarely in the crankshaft bore with the sealed or closed side facing outward (open side toward the crankshaft). Using a pilot bearing installation tool or an appropriately sized deep socket that contacts only the outer race, drive the bearing straight into the bore until it is fully seated and flush with or slightly recessed from the face of the crankshaft. Ensure the bearing is installed squarely and to the correct depth.
12
Install clutch assembly
Place the clutch disc on the flywheel with the damper springs facing the transmission (the side marked 'flywheel side' should face the flywheel). Insert a clutch alignment tool through the disc and into the pilot bearing. Position the pressure plate on the flywheel, aligning the marks made during disassembly. Install the 6 pressure plate bolts finger-tight, then tighten in a crisscross pattern gradually to avoid warping the pressure plate, bringing all bolts to proper torque specification in 3 stages. Remove the alignment tool only after all bolts are fully tightened.
13
Install transmission
Apply a light coat of high-temperature grease to the transmission input shaft splines. Position the transmission on the transmission jack and raise into position. Align the input shaft with the clutch disc splines (the alignment tool should still be in place or you should guide carefully). Slide the transmission forward, ensuring the input shaft enters the pilot bearing smoothly. The bellhousing should mate flush with the engine block. Do not force with bolts; if resistance is felt, lower slightly and re-align. Install the 4 bellhousing-to-engine block bolts and torque to specification.
14
Reinstall crossmember and mount
Raise the transmission slightly with the transmission jack. Position the crossmember onto the frame rails and install the 4 frame bolts finger-tight. Install the 2 transmission mount-to-crossmember bolts and snug. With the transmission weight supported and properly aligned, 48.0 lb-ft (65.0 Nm). Remove the transmission jack.
15
Reconnect components and install driveshaft
Reconnect the speedometer cable to the transmission and secure the retaining collar. Reconnect the backup light switch electrical connector. Reconnect any ground straps. Reconnect the clutch linkage to the clutch fork and install the retaining clip or cotter pin. Reinstall the clutch return spring. Remove the rag from the transmission tailshaft. Align the marks on the driveshaft and differential yoke, slide the driveshaft into the transmission output shaft, and install the 4 U-joint strap bolts at the rear axle. 26.0 lb-ft (35.0 Nm).
16
Refill and check fluids
If transmission fluid was drained, refill the transmission with 80W-90 GL-4 or GL-4/GL-5 compatible gear oil to the proper level (3.5 quarts total capacity). Check fluid level through the fill plug on the side of the transmission; fluid should be level with the bottom of the fill hole. Reinstall the fill plug. Verified detail (GL-5 gear oil is inappropriate for a 1972 manual transmission with yellow-metal synchronizers; GL-4 is the correct specification to avoid corrosion of brass/bronze components.): 80W-90 GL-4 Verified detail (1972 F-100 manual transmissions (3-speed or 4-speed) typically specify GL-4 gear oil, not GL-5. GL-5 additives can attack the yellow-metal (brass/bronze) synchronizers used in this era. Capacity also varies by transmission type; 3.5 quarts is not verified for the unspecified transmission.): If transmission fluid was drained, refill the transmission with SAE 80W-90 GL-4 gear oil to the proper level. Verify the exact capacity for your specific transmission (typically 3.0-4.0 pints for 3-speed, ~4 pints for 4-speed).