Anyone swap a 4t60

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coryh8504
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Anyone swap a 4t60

Postby coryh8504 » Thu Dec 16, 2021 7:42 pm

Just curious if anyone here has ever swapped a 4t60 into their car as apposed to the 4t40 trans.

4t60 comes with the 3800 engine.

Ideas or info?

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Rettax3
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Re: Anyone swap a 4t60

Postby Rettax3 » Sun Dec 19, 2021 12:28 am

My 3800 originally came with the 4T65E (Series II engine from '97), the replacement for the 4T60E. Both of my '95 Z-26s, originally 3100 cars, came with the only option available to a '95 Z-26 (boo Chevy, what were you thinking?!), the 4T60E. Obviously, that plugs right in with the proper ECM to run it... But if you are talking the older 4T60 vs 440-T4, as I understand it that was basically just a re-designation of the same transaxle. It wasn't until the "E" (for "Electronic") models were released that there was a real difference... A more knowledgeable person here could chime-in on that, mostly I REMOVE the slush-boxes and graft-in a REAL gear-box... :pardon:
Primarily, look at CV joints, count the inner number of splines, that is going to be your primary 'hurdle' for any transaxle compatibility once you are past the bell-housing. Yes, flex-plates CAN be an issue too, but relatively easy to overcome. Are you still looking at the 3800 or a 60-degree V-6 for this?


1989 SuperCharged 3800 Srs-II (First)Six-Speed GTU
1990 Turbo 3.4 5-Speed T-Type
1990 4.0L 4-Cam 32-Valve V-8 5-Speed Indy GTi (Project)
1990 Stock(!) 3.1 MPFI Auto Indy
1995 LA1/L82 4T60E Z-26
1995 3.4 DOHC Turbo 5-Speed Z-26

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coryh8504
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Posts: 21
Joined: Sun Jul 25, 2021 7:09 am
Location: Delaware

Re: Anyone swap a 4t60

Postby coryh8504 » Sun Dec 19, 2021 7:41 am

Ok. My 96 z26 is getting the transplant and I wanted to upgrade all of it. Wasn't sure if was a 3t40 or the 4t40 in my ol Girl.

But If it's plug and play..then I'm good. Are they the same hub splines and size?

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Rettax3
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Re: Anyone swap a 4t60

Postby Rettax3 » Thu Dec 23, 2021 6:51 am

Specifically which body-line, model, and year is the donor? Sounds like you are doing the 3800 swap? I can help you look that all up, but I do believe you are going to have spline differences on a lot of the various body-lines for these transaxles... GM got weird on a lot of stuff though, so making an assumption is a bad idea. So far as hubs go, that won't be what you want to be concerned about -if you have an H-Body, or a W-Body donor for instance, your L-Body will NOT accept those CV shafts, and the difference in hub-spline is only ONE of the reasons why. It is the INBOARD spline that matters... If you like, shoot me a Private Message with the basic donor info, I'll get a notification right away. Otherwise, I may not see the Post from you for a few days -I don't check in on the Forum here daily anymore...
Your Z-26 came with the newer, fully electronic version of the 4T40, aka the 4T60E. Older Berettas, from the first year up through ~'94 had the TH125C (3T40) hooked up to their V-6s, no clue when or if they discontinued that 3-speed for use on the 2.0/2.2 engine family. There are fundamental differences in the newer trans as compared to the older version that I could only help you decipher with more information and time to research it. If you wanted to know year-by-year changes of the Muncie/Getrag 282 manual 5-speed, or how it differs from the Holy-Grail 284, I could help you out a lot faster, but... :wink: That isn't your direction... :good:


1989 SuperCharged 3800 Srs-II (First)Six-Speed GTU
1990 Turbo 3.4 5-Speed T-Type
1990 4.0L 4-Cam 32-Valve V-8 5-Speed Indy GTi (Project)
1990 Stock(!) 3.1 MPFI Auto Indy
1995 LA1/L82 4T60E Z-26
1995 3.4 DOHC Turbo 5-Speed Z-26


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