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 Post subject: 4t65 issues...
PostPosted: Fri Dec 22, 2017 9:51 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4423
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
Working on my 1997 LeSabre again. 1998 4t65HD, 2002 L67, 1998 H-body NA harness with ZZP adapter to make it work with the L67. PCM is from the 1998 H-body, flashed and tuned for the L67.

Trans starts in 3rd gear, if you override it to 1st it feel like it starts in 2nd gear. Not sure what I could have missed during the rebuild, has all new electronics inside, and some upgraded hard parts. I doubt it's from the tune. There is a whining noise coming from something, sounds like it's under the supercharger. Not your typical transmission pump whine though, sounds like some weird lower pitched supercharger whine or something with an odd vacuum leak. Thoughts before I tear it open again? Trans was working before the refresh when I broke the input shaft. Not sure if the noise is related to the trans issue.

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Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, and lots more! Build thread
'97 Chevy Camaro - 3800 supercharged, T5, T-tops
'05 Cadillac STS - V8, AWD, her DD
'92 Olds Trofeo - Fair weather DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 winter DD
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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 Post subject: Re: 4t65 issues...
PostPosted: Sat Dec 23, 2017 12:00 am 
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Posts like an LN3
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Joined: Fri Jun 24, 2016 12:15 am
Posts: 511
Location: Isanti, MN
Year and Trim: 2000 SLE Saved from the scrapyard.
probably something isn't sealing properly. Did you do an air test on it to make sure that the clutches engaged?

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 Post subject: Re: 4t65 issues...
PostPosted: Sat Dec 23, 2017 12:37 am 
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Certified Bonneville Nut
Certified Bonneville Nut
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4423
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
I've heard this a few times now - knowing how the 4t65 works, each up shift is only engaging additional clutch packs. So All of the lower gear clutch packs are working if I have 3rd gear, right?

_________________
Blow all the things! Wait, I meant boost. Boost!
Image

Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, and lots more! Build thread
'97 Chevy Camaro - 3800 supercharged, T5, T-tops
'05 Cadillac STS - V8, AWD, her DD
'92 Olds Trofeo - Fair weather DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 winter DD
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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