4l80e swap from old 700r4 - Third Generation F-Body Message Boards

Charged350 · 03-12-2009, 12:37 AM

anyone ever done one, im doing a turbo motor and gonna make some pretty high numbers and i cant relly on a 700 to do the job even at level three they are just at 75o horse rated...

and the car is a driver, so i need an overdrive, this is where the 4l80e comes in, its basically a th400 with an overdrive stage one with upgraded sprags and drums holds over 1200 horse which is perfect....but i jus dont seem to have enough info on anyone doin this swap...i searched and pretty much nothing, i need to know a few things

is the TC the same

can i use the same driveshaft

crossmember will have to be made right

will i have to mod the tunel to make it fit..

and im goin with a manual valve body so no need for the electonical controler

anyone done this....if so let me know what it took....im pullin the motor to start fabbin in a week or two and id like to swap the tranny b4 i drop teh motor back in...

This ad is not displayed to registered members.
Register your free account today and become a member on ThirdGen!

gta324 · 03-12-2009, 02:11 AM

Not done it yet but soon, but I have a friend who has done it.

* New TC
* New driveshaft
* New crossmember

thats it.

noboostnogo · 03-12-2009, 08:34 AM

Have you ever considered a built t56?

did i just read that you dont wanna use a stage 3 700r4 because its rated at 750 and your gonna be making more than that AND drive it on the roads?? dude thats badd a$$ you got any pics or anything to tease us a bit or a thread that we can follow?

Charged350 · 03-15-2009, 05:27 PM

hey gta, can you get more info from your friend, if you can that be great, what size driveshaft, converter splines are differ i assume, and how hard was it to make the crossmember....and whta did he do with the torque arm...

and as for my car, its a 87 iroc, gettin a big, big turbo on it in the next week or two....im gonna start fabbin up the kit....so i might cracnk the booost up high one day and i dont wanna worry bout the tranny...

Shagwell · 03-16-2009, 08:45 AM

Converter is different, it will likely be the most expensive piece to the puzzle. The driveshaft will need to be shorter(you'll need more than a stocker for that kind of power anyway) and will need the Th400 (iirc 32 spline) yoke, and you will need to fabricate a crossmember. A little modding with a BFH as neccesary for clearnace and you should be fine.