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

I have a Dumb Question to ask.

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Old Feb 25, 2017 | 11:00 PM
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Default I have a Dumb Question to ask.

I have a 1992 convertible with a 6 speed. I bought a 1995 with a 6 speed and did an engine swap, I used the 95 bell housing and clutch and the 92 6 speed. Now for the question. when the car is not running everything shifts fine, but the pedal is very hard. With the engine running, pedal is still very hard and I can not shift into any gear. I am obviously missing something pretty big here, but what and where did I go wrong
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Old Feb 25, 2017 | 11:07 PM
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Double check your clutch slave alignment. They are a bit tricky to align properly.If you are off, the pedal will be hard as hell and not (not) move.
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Old Feb 25, 2017 | 11:12 PM
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Originally Posted by billschroeder5842
Double check your clutch slave alignment. They are a bit tricky to align properly.If you are off, the pedal will be hard as hell and not (not) move.
I will check that but am I right to assume that everything is the same between the two years. The trans was hard to separate from the bell housing and was just as hard re-installing it.
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Old Feb 25, 2017 | 11:53 PM
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The 95 came with the lighter ZF "BlueLabel" Trans. The 92 may have the heavier "Black label" 6 speed. I know up through 91 were Black Label ZF 6 speeds. They are stronger but I think they interchange. I would agree with the alignment suggestion on the slave cylinder pull rod.
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Old Feb 26, 2017 | 06:53 AM
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Originally Posted by Edd1964
I have a 1992 convertible with a 6 speed. I bought a 1995 with a 6 speed and did an engine swap, I used the 95 bell housing and clutch and the 92 6 speed. Now for the question. when the car is not running everything shifts fine, but the pedal is very hard. With the engine running, pedal is still very hard and I can not shift into any gear. I am obviously missing something pretty big here, but what and where did I go wrong
When you swapped the clutch, housing and the ZF which release bearing did you use? The '92 (if stock untouched) would have an ID of something near 1.375 +/- and the '95 (if stock untouched) 1.310 +/- so there's a potential of .70 +/- difference of the ID to the guide tube of the ZF. The guide tube OD is mentioned to be 1.305 and 1.375 in ZF specs.

You could use the clutch and housing no problem but the release bearing needs to match the ZF.

There's a tag on each of the ZF's - all ZF's are 1052-000-XXX (XXX = number). Post the XXX values for yours that's "in the car" and "on the ground". I'd expect 044 likely on the removed and 089 on the "in the car". Anything is possible!

Last edited by WVZR-1; Jan 21, 2018 at 08:09 AM.
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Old Feb 26, 2017 | 01:48 PM
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Originally Posted by WVZR-1
When you swapped the clutch, housing and the ZF which release bearing did you use? The '92 (if stock untouched) would have an ID of something near 1.310 +/- and the '95 (if stock untouched) 1.375 +/- so there's a potential of .70 +/- difference of the ID to the guide tube of the ZF. The guide tube OD is mentioned to be 1.305 and 1.375 in ZF specs.

You could use the clutch and housing no problem but the release bearing needs to match the ZF.

There's a tag on each of the ZF's - all ZF's are 1052-000-XXX (XXX = number). Post the XXX values for yours that's "in the car" and "on the ground". I'd expect 044 likely on the removed and 089 on the "in the car". Anything is possible!
I used everything off of the 95. I did notice that the 95 throw out had a retaining ring around the bearing and the 92 does not have that. I will crawl under the car later on and check the tag. I have already sold the 95 transmission so getting the tag number will be difficult.
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Old Feb 26, 2017 | 01:57 PM
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Originally Posted by Edd1964
I used everything off of the 95. I did notice that the 95 throw out had a retaining ring around the bearing and the 92 does not have that. I will crawl under the car later on and check the tag. I have already sold the 95 transmission so getting the tag number will be difficult.
oh and I also noticed that when we went to start the car for the first time, as i pressed in the pedal it fired right up, after we pumped the clutch pedal a bunch of times and shut the car off to bleed the slave. I could not get the car to start again, we are able to jump it from the starter and it starts up, but this time when you press the pedal in all the way, you hear like a tinny metal rubbing sound.
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Old Feb 27, 2017 | 01:19 AM
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Well. I checked the placement of the slave cylinder and played with it a bit and got it to somewhat work, weird throw out bearing set up, seems reversed from all the regular clutches I have worked on. I believe the slave is bad so i will replace it with the one from the doner car and bleed it out and see if it gets any better. I am liking my C3 automatic more and more everyday.
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Old Feb 27, 2017 | 03:02 PM
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Originally Posted by Edd1964
Well. I checked the placement of the slave cylinder and played with it a bit and got it to somewhat work, weird throw out bearing set up, seems reversed from all the regular clutches I have worked on.
The throwout bearing and clutch pressure plate is based on a "pull" design in these cars.
The throwout bearing does not push against the pressure plate splines as in other clutch designs.
Yes it's different but it works.
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