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

ZF problems

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Old Apr 3, 2002 | 10:00 PM
  #1  
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Default ZF problems

My buddy has a '90 6 speed that just had a new clutch, plate and flywheel installed. Prior to the install, it shifted through all of the gears just fine.
After getting the car back, it will not shift in to any gear other than 4th above 40 MPH. Get below 40 and it will shift in to 5th, 6th, 3rd, whatever. But cross that 40 mph barrier, and 4th is all you get.
The shop that installed the clutch says the synchros might be bad. Is this possible? It seems like something electronic not allowing it to shift.
It's not like it's grinding when trying to go from 4th to 5th, it's more like it is completely locked out.

Any suggestions??
Thanks.
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Old Apr 3, 2002 | 10:12 PM
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Default Re: ZF problems (SaveTheWave)

could the CAGS be jamming things up?

What about a bad hydrolic slave? or, something as simple as not enough fluid in the slave.

a rebuild is about $3000.00... a used one is about $2000.00... just hope it is something simple.


[Modified by bogus, 9:13 PM 4/3/2002]
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Old Apr 3, 2002 | 10:13 PM
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Default Re: ZF problems (SaveTheWave)

Sounds like they screwed up the CAGS system which includes a 5th/6th lockout as well as the 2/3 lockout. Don't know how, but that's what happened.

Pete
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Old Apr 3, 2002 | 10:23 PM
  #4  
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Default Re: ZF problems (PeteL)

Thank you guys. CAGS was my first thought as well. I believe it was defeated by the previous owner, but I'm not sure.
I had no idea it had a 5th/6th lockout. Hopefully that info will help.

Thanks again :)
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Old Apr 3, 2002 | 10:36 PM
  #5  
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Default Re: ZF problems (SaveTheWave)

Thank you guys. CAGS was my first thought as well. I believe it was defeated by the previous owner, but I'm not sure.
I had no idea it had a 5th/6th lockout. Hopefully that info will help.

Thanks again :)
I don't think there is a 5th/6th lockout... I am wondering if the electronics is out of wack or what.
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Old Apr 3, 2002 | 10:45 PM
  #6  
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Default Re: ZF problems (bogus)

YUP, CAGS denies 5/6 as well.
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Old Apr 3, 2002 | 10:53 PM
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Default Re: ZF problems

I'm the guy with the current problem!!!!

Thanks a billion for the input... the 5th/6th lockout was the big question. Now that we know the CAGS can do both I can try and rest easy tonight knowing I may not have to deal out the cash for a rebuild!!!

CORVETTEFORUM ROCKS!!!
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Old Apr 4, 2002 | 10:50 PM
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Default Re: ZF problems

Well, my car is back and it's baaaaad!!! hehehe. The CAGS was the problem. The guy hooked it back up for some reason. Probably one of those common things you do if your a mechanic. See something wrong you plug it back in or tighten it up just out of habit. Car is driving great and it's awesome to have a new clutch and have all that HP back!

Again, thanks for the help!
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Old Apr 4, 2002 | 11:23 PM
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Default Re: ZF problems (Wanderer)

:cheers:
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