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

Auto trans problem

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Old Sep 13, 2015 | 02:26 PM
  #1  
SteveandBen's Avatar
SteveandBen
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Default Auto trans problem

Hi foilks, after not driving the Vette for a while (86 Z51) I took it out today and the trans was acting up. Slipping really bad in 2,3, and Drive but seems to work fine in OverDrive and Reverse. Any suggestions?

TIA
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Old Sep 14, 2015 | 01:02 AM
  #2  
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Cliff Harris
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From: Anaheim CA
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Drain and replace the fluid and replace the filter. If that doesn't solve your problems then take it to a trans shop.

I suggest a really dirty old place that's been there a million years vs. the shiny new place with high school kids rebuilding the transmissions.

To get a good performance transmission shop call TransGo Technical Support (they don't do support on their web site) and ask for a recommendation. They have a list of trans shops that know what they are doing.
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Old Sep 14, 2015 | 08:08 AM
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confab
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That's a really strange condition. You mean the manual select 2/3/D ranges, but it's okay in the OD range?

There's a thing in there called a coast clutch, it gives your engine braking in the manual select ranges. (It also backs up the forward sprag) Sounds like a leak in the coast clutch circuit or a bad piston/lip seal.

Try what Cliff said and if that doesn't help? Leave it on OD till you can get it rebuilt.
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