ZF 6 Tailstock (Speedo Cover) leak 1992 ZR1 - ZR-1 Net Registry Forums

Tripper_1966 · 08-30-2016

Having an ongoing issue with the tailstock housing leaking tranny fluid where the slip yoke slides onto the tranny. Tranny oil is leaking onto exhaust while driving and drips onto ground after the drive.

as a recommendation from Bill (ZFDoc) rebalance driveshaft and put black lithium grease into double lip seal. Was done by the service dealer and sent out to a special shop to balance. Dealer installed new aftermarket seal in tailstock (speedo cover) and installed 10W60 oil. Leaks worse now.

Back to the dealer and they said the vent tube to the tranny was plugged, they fixed that and suggested to install a factory GM seal into the tailstock. Leaks the same as after the first seal replacement.

Initial leak was less than the two repairs.

Car has original tranny, driveshaft, etc. and less than 8000 miles.

Dealer and myself at a loss where to go next.

Wonder if this has happened to anyone and any suggestions?

Thanks

A26B · 08-30-2016

Was the tailstock bushing for driveshaft yoke replaced?

C-beam bolts being overtightened can distort bushing roundness & cause excessive bushing wear. Excessive wear translates into seal leakage.

Tripper_1966 · 08-30-2016

Dealer did replace bushing, said it was tight.

What's an aftermarket part number for the bushing?

Where are the C-beam bolts?

Thanks Jerry!

Tripper_1966 · 08-30-2016

yes bushing was replaced. Dealer is checking torque on C beam bolts

Paul Workman · 08-30-2016

Quote:

Originally Posted by Tripper_1966

yes bushing was replaced. Dealer is checking torque on C beam bolts

The C-beam has 4 bolts; 2 at each end; two passing through the tail stock, and two anchor at the differential.

IMO, a set of Bill Boudreau's C-beam plates are worth every cent, far as removing and re-installing the C-beam and getting it properly centered.

Positioning the tail shaft in the 'tunnel':

Tripper_1966 · 09-12-2016

We found a good used driveshaft with slip yoke and the leak is fixed.

Now to send the 7300 mile original shaft and yoke to Bill .....

A26B · 09-13-2016

Quote:

Originally Posted by Tripper_1966

We found a good used driveshaft with slip yoke and the leak is fixed.

Now to send the 7300 mile original shaft and yoke to Bill .....

Please let us know what Bill finds wrong with your yoke. Very unusual to have a problem with a yoke, especially at 7300 miles.

Glad to hear you isolated the problem.

08-30-2016	#1
Tripper_1966 Join Date: Apr 2013 Location: Barrie, Ontario Posts: 20	ZF 6 Tailstock (Speedo Cover) leak 1992 ZR1 Having an ongoing issue with the tailstock housing leaking tranny fluid where the slip yoke slides onto the tranny. Tranny oil is leaking onto exhaust while driving and drips onto ground after the drive. as a recommendation from Bill (ZFDoc) rebalance driveshaft and put black lithium grease into double lip seal. Was done by the service dealer and sent out to a special shop to balance. Dealer installed new aftermarket seal in tailstock (speedo cover) and installed 10W60 oil. Leaks worse now. Back to the dealer and they said the vent tube to the tranny was plugged, they fixed that and suggested to install a factory GM seal into the tailstock. Leaks the same as after the first seal replacement. Initial leak was less than the two repairs. Car has original tranny, driveshaft, etc. and less than 8000 miles. Dealer and myself at a loss where to go next. Wonder if this has happened to anyone and any suggestions? Thanks __________________ [B]1992 ZR1, #454[/B] [I]Stock and mint with 6600 miles[/I]

08-30-2016	#2
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,385	Re: ZF 6 Tailstock (Speedo Cover) leak 1992 ZR1 Was the tailstock bushing for driveshaft yoke replaced? C-beam bolts being overtightened can distort bushing roundness & cause excessive bushing wear. Excessive wear translates into seal leakage. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

08-30-2016	#3
Tripper_1966 Join Date: Apr 2013 Location: Barrie, Ontario Posts: 20	Re: ZF 6 Tailstock (Speedo Cover) leak 1992 ZR1 Dealer did replace bushing, said it was tight. What's an aftermarket part number for the bushing? Where are the C-beam bolts? Thanks Jerry! __________________ [B]1992 ZR1, #454[/B] [I]Stock and mint with 6600 miles[/I] Last edited by Tripper_1966; 08-30-2016 at 04:36 PM.

08-30-2016	#4
Tripper_1966 Join Date: Apr 2013 Location: Barrie, Ontario Posts: 20	Re: ZF 6 Tailstock (Speedo Cover) leak 1992 ZR1 yes bushing was replaced. Dealer is checking torque on C beam bolts __________________ [B]1992 ZR1, #454[/B] [I]Stock and mint with 6600 miles[/I]

09-12-2016	#6
Tripper_1966 Join Date: Apr 2013 Location: Barrie, Ontario Posts: 20	Re: ZF 6 Tailstock (Speedo Cover) leak 1992 ZR1 We found a good used driveshaft with slip yoke and the leak is fixed. Now to send the 7300 mile original shaft and yoke to Bill ..... __________________ [B]1992 ZR1, #454[/B] [I]Stock and mint with 6600 miles[/I]