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Author Topic: trans shift  (Read 2100 times)

Offline 77 cc lb

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trans shift
« on: June 16, 2012, 03:37:16 pm »
I recently bought an 88 R20 suburban with a 454/th400 trans. The trans. was rebuilt a couple years ago. It doesn't want to go past 2nd gear, was wondering if the modulator could be bad or something else. I added a qt of fluid because it was low and still no difference. Any ideas would be appreciated.
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87 Chevy crewcab shortbed soon to have a 454/400

Offline slammed79

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Re: trans shift
« Reply #1 on: June 16, 2012, 07:39:13 pm »
Can you manually get it in to third? If not it could be gone.
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Offline Lt.Del

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Re: trans shift
« Reply #2 on: June 16, 2012, 11:36:02 pm »
you sure your vacuum line (to modulator) is still hooked up to the intake vacuum behind the TBI?  I guess the '88 TBI th400's are that way.
Passing gear stuck in passing mode?
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Offline 77 cc lb

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Re: trans shift
« Reply #3 on: June 18, 2012, 04:03:30 pm »
Thanks Lt.DeL and slammed I will check those out. I am going to try and get a hold of prev. owner to see who did the repair and a couple other things. Thanks guys
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87 Chevy crewcab shortbed soon to have a 454/400
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