drivetrain

Driveshaft - Rear

for 1966 Chevrolet Corvette 327ci V8 · RWD

Difficulty

Moderate

Time

2.4 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 covers the removal and installation of the rear driveshaft on a 1966 Chevrolet Corvette with 327ci V8, including U-joint service and differential yoke procedures.

Warnings

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

⚠The differential pinion nut torque is critical and must be performed with proper pinion preload measurement. Incorrect preload will cause premature bearing failure or pinion seal leaks.

⚠Mark all components before disassembly to maintain driveline phasing. Improper phasing will cause severe vibration.

ℹ️Rear differential fluid may drain from the pinion seal area when the driveshaft is removed. Have a drain pan ready and plan to top off fluid after reassembly.

Tools required

Floor jack and jack standsEssential

Torque wrench (0-300 Nm / 0-220 lb-ft range)Essential

1/2 inch drive ratchet and socket setEssential

9/16 inch wrenchEssential

Pinion yoke holding tool or large pipe wrenchEssential

Punch or marker for alignment marksEssential

Soft-faced mallet

Inch-pound torque wrench (for pinion preload check)Essential

Drain panEssential

Threadlocker (blue, medium strength)Essential

3/8 inch drive ratchet

C-clamp or U-joint press

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Parts

Rear driveshaft assembly (if replacing) × 1 — Use OEM specification
Differential pinion yoke nut × 1 — GM 3857598 or equivalent
U-joint strap bolts (if damaged) × 4 — Grade 8, 5/16-18 x 3/4
Universal joint (if servicing) × 2 — Spicer 5-260X or equivalent 1310 series

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

Fluids

75W-90 GL-5 Gear Oil — 2 qt

Preparation

Park vehicle on level surface and engage parking brake
Raise rear of vehicle and support securely on jack stands under the frame rails
Remove rear wheels to improve access if necessary (optional but recommended)
Place drain pan under differential pinion area to catch any gear oil that may leak
Clean area around driveshaft yoke and differential pinion flange with solvent to identify fasteners and prevent contamination

Procedure

1
Mark driveline alignment
Using a punch or paint marker, make alignment marks on the driveshaft yoke and differential pinion flange to ensure proper phasing during reassembly. Make a clear mark that spans both components. Also mark the relationship between the driveshaft tube and transmission output shaft yoke at the front U-joint.
2
Remove rear U-joint from differential
Remove the 4 U-joint strap bolts securing the rear universal joint to the differential pinion yoke using a 9/16 inch wrench or socket. Support the driveshaft with one hand while removing the final bolts. Note the position of the straps for reassembly.
3
Lower rear of driveshaft
Carefully lower the rear of the driveshaft and slide the U-joint caps out of the pinion yoke. Tape or secure the bearing caps to the U-joint to prevent them from falling off and losing needle bearings.
4
Remove driveshaft from transmission
Slide the driveshaft forward approximately 1-2 inches into the transmission tailhousing to disengage the rear U-joint from the pinion yoke, then slide it rearward to withdraw the slip yoke from the transmission output shaft. Once clear, lower the front of the driveshaft and remove it from under the vehicle. Keep the assembly level to avoid losing transmission fluid from the tailshaft.
5
Inspect U-joints and slip yoke
Inspect both universal joints for wear, binding, or loose needle bearings. Check the slip yoke splines for wear or damage. Rotate each U-joint by hand; it should move smoothly without binding or excessive play. If replacement is needed, note the U-joint orientation before pressing out. Check the slip yoke seal surface for scoring or grooves.
6
Service or replace U-joints (if needed)
If U-joints require replacement, use a C-clamp or U-joint press to remove bearing caps. Press new U-joint bearings into yokes, ensuring needle bearings remain in place with grease. Install retaining clips or straps as applicable. This 1966 Corvette uses a strap/U-bolt-style retention at the rear pinion yoke and internal snap-ring retention at the front (slip yoke) end.
7
Inspect differential pinion seal
With the driveshaft removed, inspect the pinion seal for leaks or damage. Check pinion flange for runout or damage. If seal replacement is required, the pinion yoke must be removed, requiring careful attention to pinion preload during reassembly.
8
Install driveshaft to transmission
Apply a thin coat of transmission fluid or gear oil to the slip yoke splines. Align the front U-joint with the transmission output shaft yoke according to your alignment marks. Slide the slip yoke into the transmission tailshaft until fully seated. The driveshaft should slide in approximately 1-2 inches into the transmission.
9
Align rear U-joint with pinion yoke
Raise the rear of the driveshaft and align the rear U-joint bearing caps with the differential pinion yoke according to your alignment marks. Ensure the U-joint caps are properly seated in the yoke bearing bores. Install the U-joint straps over the bearing caps.
10
Install U-joint strap bolts
Apply blue threadlocker to the threads of the U-joint retaining fasteners (verify whether the application uses 2 U-bolts with 4 nuts or 4 strap bolts for this vehicle). Install the bolts finger-tight, ensuring the straps are properly positioned over the bearing caps and the U-joint is centered in the yoke. Torque the U-joint strap bolts to specification in a crisscross pattern.
Torque spec
U-Joint Strap Bolts35 Nm (26 lb-ft)
11
Check driveshaft rotation
Rotate the driveshaft by hand through several complete revolutions. It should rotate smoothly without binding, tight spots, or unusual noise. Any binding indicates misalignment or a damaged U-joint.
12
Check differential fluid level
Remove the differential fill plug and check the gear oil level. The level should be at the bottom of the fill hole. Add the manufacturer-specified GL-5 gear oil of correct viscosity to bring it to proper level, and add limited-slip friction modifier if the differential is a Positraction unit. Some fluid may have been lost when the driveshaft was removed. Install the fill plug securely.
13
Reinstall wheels (if removed)
If rear wheels were removed for access, reinstall them and torque lug nuts to specification in a star pattern.

Reassembly

Verify all alignment marks were matched during installation to prevent driveline vibration
Ensure slip yoke is fully engaged in transmission tailshaft with proper spline engagement
Double-check that all U-joint strap bolts are torqued to specification with threadlocker applied
Confirm differential fluid level is correct before test driving

Verification

Lower vehicle and start engine, shift through all gears (engine running, brakes applied) to verify driveline engagement
Test drive vehicle at various speeds (25 mph, 45 mph, 65 mph) and listen for any unusual vibration, clicking, or clunking sounds
Check for vibration during acceleration and deceleration
Inspect U-joint strap bolts and differential pinion area for any fluid leaks after test drive
Re-torque U-joint strap bolts after 50-100 miles of driving as a precautionary measure

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