trans swap ideas??????????? - Truck Repair Advice


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trans swap ideas???????????

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illbigpickle
New User

Mar 30, 2008, 7:33 PM

Post #1 of 2 (2401 views)

trans swap ideas???????????	Sign In

i have a 1990 chevrolet 2500 2wd. it has the 3.73 rear gear and a four speed trans. the four speed is a manual with low gear so almost a three speed. looking to get some better milage and less rpm at freeway speeds. i am thinking about a turbo 700r4. does any body know of any problems with this swap. tbi 350ci any problems with stock cpu???

(This post was edited by illbigpickle on Mar 31, 2008, 8:37 PM)

DanD
Veteran / Moderator
DanD profile image

Mar 31, 2008, 4:44 AM

Post #2 of 2 (2394 views)

Re: trans swap	Sign In

Quote

i have a 1990 chevrolet 2500 2wd. it has the 3.73 rear gear and a four speed trans.

Do you mean a 4 speed manual trans or automatic?
If automatic, you’re already where you want to be.
If converting to automatic, then there might be some issues with the ECM. Not that this year of 700R4 was electronically shifted but the ECM’s prom and wiring harness may not accommodate for the torque converter’s lock up clutch(TCC).
Not all that big of a deal, you could always just add a manual lock up switch and turn it on when you’re at highway speeds.
If a 700R4 or any lock up trans isn’t allowed to go into lock up, the trans will run overheated and likely burn up the fluid.

Dan.

Canadian "EH"

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