C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Do ZFs leak from the input shaft

Thread Tools
 
Search this Thread
 
Old Nov 19, 2003 | 07:47 PM
  #1  
ZZZASY's Avatar
ZZZASY
Thread Starter
Instructor
15 Year Member
 
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Default Do ZFs leak from the input shaft

I replaced my rear main seal myself and couldn't get anyone to help me put my transmission back; so I paid a shop to install the transmission. Went to pick the car up and the machanic said that he believes the car is leaking from the input shaft, because when he took the car for test ride and went around 60 mph the bellhousing has oil or fuild in it. He states the when the car hit certain speeds; fuild may be leaking from around the seals of the input shaft. What you guys think?

ZZZASY
'96 LT4
Reply
Old Nov 19, 2003 | 08:16 PM
  #2  
bogus's Avatar
bogus
Team Owner
25 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Default Re: Do ZFs leak from the input shaft (ZZZASY)

I guess it's possible...
Reply
Old Nov 19, 2003 | 08:22 PM
  #3  
ZZZASY's Avatar
ZZZASY
Thread Starter
Instructor
15 Year Member
 
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Default Re: Do ZFs leak from the input shaft (bogus)

But, this is your first time hearing of this?

ZZZASY
Reply
Old Nov 19, 2003 | 08:33 PM
  #4  
CentralCoaster's Avatar
CentralCoaster
Team Owner
 
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Default Re: Do ZFs leak from the input shaft (ZZZASY)

have you eliminated the possibility of a rear main engine leak, or a clutch slave leak? I'm still scratching my head on all this about my '85 ST10.
Reply
Old Nov 19, 2003 | 09:33 PM
  #5  
ZZZASY's Avatar
ZZZASY
Thread Starter
Instructor
15 Year Member
 
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Default Re: Do ZFs leak from the input shaft (CentralCoaster)

I just replaced the rear main seal and they say it is still leaking; they say the back of the flywheel is not wet; so it must be coming from the front (shaft).

ZZZASY
Reply
Old Nov 20, 2003 | 08:14 AM
  #6  
ZZZASY's Avatar
ZZZASY
Thread Starter
Instructor
15 Year Member
 
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Default Re: Do ZFs leak from the input shaft (ZZZASY)

Resubmitting for the daytime crew. As stated, changed the rear main seal because clutch disc, pp, flywheel was oil covered. Had a shop put the trans back in. When they did, they said the bellhousing is still collecting fuild; so they think it must be coming from the input shaft. Does this sound feasible?

ZZZASY
'96 LT4
Reply
Old Nov 20, 2003 | 08:44 AM
  #7  
bogus's Avatar
bogus
Team Owner
25 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Default Re: Do ZFs leak from the input shaft (ZZZASY)

contact Bill at http://www.zfdoc.com

I know he would have an answer.
Reply
Old Nov 20, 2003 | 10:31 AM
  #8  
SPD DMN's Avatar
SPD DMN
Le Mans Master
20 Year Member
 
Joined: Oct 1999
Posts: 9,713
Likes: 3
From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Default Re: Do ZFs leak from the input shaft (bogus)

There is a paper gasket that hods the input shaft housing to the tranny, but I have never heard of one leaking. As posted above, ask Bill as he deals with these things more than anyone.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Nov 21, 2003 | 06:48 AM
  #9  
Atok's Avatar
Atok
Melting Slicks
10 Year Member
 
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
Default Re: Do ZFs leak from the input shaft (ZZZASY)

Resubmitting for the daytime crew. As stated, changed the rear main seal because clutch disc, pp, flywheel was oil covered. Had a shop put the trans back in. When they did, they said the bellhousing is still collecting fuild; so they think it must be coming from the input shaft. Does this sound feasible?
Yep, it's possible, unlikely but possible. Another area you can get fluid from is your dual mass flywheel. There is a fluid damper between the masses. There is a procedure in the GM Service manual on how to check the flywheel. If it was your clutch slave I think you would know it pretty quick. It wouldn't be long before you lost the pedal.
Reply
Old Nov 21, 2003 | 08:13 AM
  #10  
ZZZASY's Avatar
ZZZASY
Thread Starter
Instructor
15 Year Member
 
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Default Re: Do ZFs leak from the input shaft (Atok)

I've done the SMF conversion; so the dual mass problem doesn't apply. The slave cylinder reservior is full; so its not that. I questioned the shop and they said its definitely the trans. I've found a replacement trans I'm going to use until I can get mine to ZFDoc.

ZZZASY
'96 LT4
Reply
Old Nov 21, 2003 | 05:55 PM
  #11  
Atok's Avatar
Atok
Melting Slicks
10 Year Member
 
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
Default Re: Do ZFs leak from the input shaft (ZZZASY)

I've found a replacement trans I'm going to use until I can get mine to ZFDoc.
If you don't mind me asking, what are you paying for the replacement transmission? It's a ZF6 I assume.

If all you have is an input shaft leak I would check with GM first. They sell all the external parts for the ZF6 (nothing inside the case). Everthing from the tailshaft to the input bearing retainer and shims. I bet they have the seal and gasket you need. Pop a few allen headed bolts out and you're in business.


:smash:


[Modified by Atok, 6:59 PM 11/21/2003]
Reply
Old Nov 22, 2003 | 09:35 AM
  #12  
ZZZASY's Avatar
ZZZASY
Thread Starter
Instructor
15 Year Member
 
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Default Re: Do ZFs leak from the input shaft (Atok)

There was one in the for sale forum for $1500. That was a good price and I had the money available so I thought I better grab it while I can. Waiting for it to arrive. Mine has a whine also and it had been leaking fuild for a long time; so I figured that it would be giving me more problems soon. I've had the car for 4 years and I never thought it was too good from the beginning. I tried a couple of times to get serviced under the warranty, but they said it was ok. So, I guess it was.

ZZZASY
'96 LT4
Reply
Old Nov 22, 2003 | 04:11 PM
  #13  
bogus's Avatar
bogus
Team Owner
25 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Default Re: Do ZFs leak from the input shaft (ZZZASY)

the 96's are not as strong as the earlier ones... but they are still prone to making noise.

the whine is normal, unless REAL loud!!!!
Reply
Old Nov 23, 2003 | 01:49 PM
  #14  
ZZZASY's Avatar
ZZZASY
Thread Starter
Instructor
15 Year Member
 
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Default Re: Do ZFs leak from the input shaft (bogus)

The transmission I'm getting is out of an '92 which was reportly rebuilt with around 30,000 miles on it. I was wondering if all the ZFs where the same or if enhancements had been made to them over the years.

ZZZASY
'96 LT4
Reply

Get notified of new replies

To Do ZFs leak from the input shaft





All times are GMT -4. The time now is 01:14 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE