okay, so now that i've asked about bonnies (and other 3800'*) with turbos, the next question - has anyone sucessfully mounted a 4t80 to their 3800?

matt

I always thought it was too big. It wouldn't mount right.

I believe the "8" in 4t80 stands for V8.
The same for ours. The "6" in 4t60/65 is for V6.

no... it'* just how gm designates trannies. the first number is how many speeds it has. letter designates fwd vs rwd (transversal vs longitudinal), and the last number is a relative torque rating - so the 4t80 handles more torque than the 4t65 handles more torque than the 4t60 handles more torque than the 4t40, etc...

it is a little on the larger side, which i guess is what drove my curiosity about it being in any h bodies...

matt

yikes - just checked it out on the powertrain site - that sucker is 294 pounds. that'* crazy compared to rwd trannies, but such is life. for those interested, depending on torque convertor size, the 4t65 ranges from 205 lb to 248 lb (wet)

matt

I have to admit I'm not that knowledgable on fwd transmissions but wouldn't this weight also cover the differential?

yupperz

matt

its rated for 305ft/lbs of torque, WITH 6500 rpm shifts , i believe the 4t65HD is 280, but im unsure of the max revs on it, anyone know?


availible in 3.11, 3.48 or 3.71 gears if anyone cares

4t65 max revs:

1-2 6500 rpm
2-3 6250 rpm
3-4 6000 rpm

that'* 04. earlier models were more limited on the 3/4 shift (for kicks just checked out 99 - the 3/4 is limited to 5200 rpm on the 4t65)

but knowing how much people have been able to put on a 65, i just was thinkin - man, the 4t80 could prolly handle some serious power if properly rebuilt...

matt

But for the price it would take to buy a 4t80 and make it work with the 3800, you could probably just buy a performance 4t65HD from one of the many vendors and be able to handle 400 to 500HP easily.

If ur interested in transmisions check out domesticperformance.com he has a few fwd beefed up tranies i think his 4t80 is rated at 500 hp