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Trans swap

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#1 Canada4g63



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Posted 19 September 2017 - 05:34 PM

Snyone ever put a,4t65e tran in one of the TGP's

#2 Imp558


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Posted 19 September 2017 - 06:38 PM

That would be easy mechanically, every other aspect of it would suck, like a whole lot of suck and a lot of tuning. You'd almost be better off running a TCI controller.


"If everything seems under control, you're not going fast enough"  - Mario Andretti


1996 Buick Regal L67/4T65E-HD swapped - 1995 Buick Regal GS - 1980 Dodge Sno-Commander - 1968 Empi Imp on '67 Pan - 2001 Chevrolet Express 3500


Her Stuff: 1996 SSEi - 2001 Monte Carlo SS

#3 55trucker


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Posted 19 September 2017 - 10:42 PM



the TGP pre-dates the 4T60E trans, but that doesn't mean all is lost.....


you would need to reprogram the MEMCAL *chip* inside the casing. 1990 did not see the electronic transmissions but 1993 did where the *T* code LHO engines are concerned. Your engine is a *V* code LG5 which is basically an LHO with a lung bolted on.


Your ECM case is the same case that is used in the 1993 W-body Lumina (1227727) which has the 3.1 LHO engine & the 4T60E trans. If you were serious on this you would need the wiring harness from needed car to splice into to do the conversion on yours. The ECM 16149396 which controls the DOHC engine would also work as it too was used with the 3.1 LHO in '93, Now I know that the 4T60E-HD would be doable because it was used in the OBDI cars, but I don't have enough info as to whether the OBDII 4T65E trans could be made backward compatible with an OBDI ECM.


COPY the added link to keep in your is getting hard to find









#4 Heartbeat1991


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Posted 19 September 2017 - 11:38 PM

Why would you want to do this?  It's a lot of work and expense.

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#5 Canada4g63



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Posted 22 September 2017 - 01:53 PM

I might want to do this because sourcing a newer 4t65e trans is easier and you can have one build and be done with the trans

#6 Heartbeat1991


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Posted 22 September 2017 - 08:19 PM

Or just get your stock trans built and put it back in and be done.   :shrug:

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#7 White93z34


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Posted 22 September 2017 - 09:29 PM

I have a core TGP 4t60 that I'd GIVE away at this point

-Chris D. chrissig.jpg 1992 Chevrolet Lumina Z34 3.4L TDC v6 Getrag 284 1990 Pontiac Turbo Grand Prix 3.1L v6 Hydramatic 4T60 Qty:2 2001 Cadillac Seville STS 4.6L DOHC v8 Hydramatic 4T80 1987 Chevrolet Camaro Z28/IROC-Z 5.0L v8, Hydramatic 700R4 2007 Ford Ranger 2.3 i4 Automatic

#8 Dark Ride

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Posted 23 September 2017 - 04:21 AM

I have a 4T65e in my tgp. But it also is OBD II. Keep in mind the 4T65 can fail too. Unless you convert to OBD II, I don't think it can be done.

-Mitch Reed

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#9 jman093


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Posted 26 September 2017 - 04:08 AM

I have a core TGP 4t60 that I'd GIVE away at this point


And I have a TGP with all its gears except 1st, 2nd, 4th, Neutral, Reverse, and converter lock-up. And use of its lone 3rd gear requires putting the shifter in neutral. Believe it or not, it's been my daily most of the time for the last few months, now that I finally got the awful, awful DMV to register the darn thing. Starts are sluggish, but it goes great down the highway in 3rd gear, shifter in neutral. You should buy it and put said transmission it. :bonk:

Jesse M.


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-1990 Turbo Grand Prix - Black

-1990 Turbo Grand Prix - Red

-1990 Turbo Grand Prix - Red

#10 mfewtrail


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Posted 29 September 2017 - 08:41 AM

A 65-E swap retaining OBD-1 is possible if you use a early 90'sISH  diesel truck transmission controller.


Read this and any subsequent threads started by the same author on that subject.


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93 SE, '90 Black/tan TGP, & '90 Red/tan TGP

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