ZF tranny prob? Help?

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May 23, 2002 | 07:01 PM

satyr7777

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Racer

Joined: Feb 2001

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From: San Antonio, TX USA

ZF tranny prob? Help?

OK- on an upshift at around 4000 rpm into 5th it actually made that unmistakeable sound of gear GRIND (and I assure you the clutch was fully depressed). I've also noticed that over the last few months, it's sticking when I change gears- (any gear change, but mostly 1 to 2, and 4 to 5), and intermittently. I checked the fluid level- a little short, I filled to the proper level- with no difference. When I bought the vette the prev owner said he'd had the clutch master cyl replaced, but had no receipt. Are you guys thinking:
-clutch
-clutch master cyl
-both

AND - Does anyone know of a good tech in the San Antonio, Austin area I can bring this to without getting my eyes screwed out? Thanks in advance- J

May 23, 2002 | 07:05 PM

Sharky Guam

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Joined: Feb 2002

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From: Guam

Re: ZF tranny prob? Help? (satyr7777)

If you pump the clutch pedal a few times before the shift, does it go in any easier? If so, you may either have a little air in the system or your slave cylinder is going away.

May 23, 2002 | 07:19 PM

93Polo

Team Owner

Joined: Oct 1999

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From: Guinness Its whats for B'fast JAWGA

CI 3-4-5-9 Veteran

Re: ZF tranny prob? Help? (satyr7777)

Clutch master cyl. would be my first thingk to look at. When mine went bad fluid was leaking into the driver floorboard. It would stick between shifts.

May 23, 2002 | 07:29 PM

satyr7777

Thread Starter

Racer

Joined: Feb 2001

Posts: 481

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From: San Antonio, TX USA

Re: ZF tranny prob? Help? (93Polo)

If I pump the clutch it does shift easy- (usually just one pump). Haven't noticed any fluid on the floorboard though... How could I clear it if it's air? Suggestions?

May 23, 2002 | 07:44 PM

FoolCrzy

Melting Slicks

Joined: Apr 2001

Posts: 2,474

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From: Drive it Like You Hate it Cincinnati OH

Re: ZF tranny prob? Help? (satyr7777)

Could be the slave cylinder...
:cheers:

May 23, 2002 | 09:19 PM

1991Z07

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Joined: Feb 2000

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From: Austin Texas

Re: ZF tranny prob? Help? (satyr7777)

Quote:

AND - Does anyone know of a good tech in the San Antonio, Austin area I can bring this to without getting my eyes screwed out? Thanks in advance- J

You can take it Gary Kropat at Austin Corvette http://www.austincorvette.com/ . He'll treat you right. Has lots of experience on all 5 versions of the Corvette.

Give him a call.

May 23, 2002 | 09:28 PM

ericcer

Drifting

Joined: Jul 2001

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From: Largo Florida

Re: ZF tranny prob? Help? (Joe90)

I you have over 50k miles on the car, replace the clutch master and slave. It is cheap insurance considering the cost of a ZF rebuild. Sounds like your hydralic system is screwed.

The quote below is taken from http://zfdoc.com/clutch_hydraulic.htm

Quote:

To date (11/06/01) I have rebuilt 98 of these ZF S6-40 transmissions. I would say that 95% of those were damaged while operating with some type of degraded hydraulic clutch condition.

Power shifting while under these conditions can cause catastrophic damage to the synchronizers and their related components.

[Modified by ericcer, 7:29 PM 5/23/2002]

May 24, 2002 | 01:15 AM

satyr7777

Thread Starter

Racer

Joined: Feb 2001

Posts: 481

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From: San Antonio, TX USA

Re: ZF tranny prob? Help? (ericcer)

Agreed- I should get it looked at soon. If anyone knows of a good tech in San Antonio, please refer me! I could drive it to Austin, but it would be easier to get it done locally. Thanks for the help- J