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

Hard shifting 700r4

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Old May 17, 2008 | 03:07 AM
  #1  
triple_E_Farm's Avatar
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Default Hard shifting 700r4

I have an 87 convert with around 88000 miles on its 700r4. When you go from park to drive or reverse it goes in to gear really hard. It doesn't do it all the time but it does 75 % of the time. Just wondering if any one had any ideas. Some one told me its in the rear end others have said it the tranny and others have said change the tranny fluid. I am just trying to get some feed back.

Thanks.
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Old May 17, 2008 | 09:41 AM
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where is your idle speed?
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Old May 17, 2008 | 03:28 PM
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My 88 was doing the same. Set T.V. cable and hard shifts went away. I get 5 mpg better too.
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Old May 17, 2008 | 03:32 PM
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Maybe ask Pete K. He is the tranny guru here. My guess is high line pressure. . . a la T.V cable adjustment.

There is a tap on the side of the transmission where you could put in a guage and see where your pressure is at. I dont know the specs off hand but someone else might help ya.
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Old May 19, 2008 | 10:54 AM
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triple_E_Farm's Avatar
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I believe my idle speed after every thing is warmed up. Would be around 600-700 rpm's, I could be wrong I will have to check that and see.

I thought I set the tv cable by opening the catch on the end of the cable right there at the throttle body. Then open the throttle body all the way. Maybe I didn't do it right.
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Old May 19, 2008 | 10:56 AM
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mines doing something similar and it idles 800-900 rpm

sounds like i have a vaccum leak?
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Old May 19, 2008 | 07:30 PM
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is there a clunk?
is it only from park to rev/drive?
if it is try looking at the universal joints.
there should be 6 in total.
but try the drive shaft ones first
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