need to know for sure today

worknprog.99 · 04-19-2009, 12:45 PM

this is off a 1998 sc gtp with 68000 miles i need to know for sure if it will work on the 3400 before i tell the guy if i want it or not...

04-19-2009, 01:39 PM

4T65E-HD......will bolt right up to the 3400, but requires fabrication, some custom parts and programming to install in an Alero.
PM BlackJack.

worknprog.99 · 04-19-2009, 01:50 PM

alriht thanks. i new about the programing and mounts but am not sure about the axle

kwhauck · 04-19-2009, 01:53 PM

pretty sure he used stock gtp axles with gtp hubs, but then it pushed out his front track width 1"

worknprog.99 · 04-19-2009, 02:06 PM

yeah i am going to try and run with the stock for a while.

buickboy71 · 04-19-2009, 08:55 PM

If it came out of a 98 Grand Prix with a SC 3800, the bellhousing is for a 90 degree V-6. The 3400 is a 60 degree V-6. So without an adapter plate, it will not bolt directly to a 3400.

cobrajeff92 · 04-20-2009, 08:38 PM

actually it will. alot of 3400 had the 4t65. 3100 grand prix had the 65 also. most minivans and impala 3400 came with the 4t65

worknprog.99 · 04-20-2009, 08:47 PM

we are using the stock one at low psi to begin with........ we will be starting sometime this week.. going out buying stuff tomorrow distplacing battery and moving washer fluid and getting some peices to customize the exhaust to the turbo.... im very excited

buickboy71 · 04-20-2009, 10:00 PM

The same model number of the transmission doesnt always mean that it will fit. The transmission can have the same internal parts, but different cases with different bellhousings. The old turbo 400 had several different bellhousings. There was a Chevy pattern and a BOP pattern and some even had a universal pattern. Late 80's S-10 blazers had 700-R4 transmissions. The 4.3 had a 90 degree bellhousing while the 2.8 had a 60 degree bellhousing. While the internals were the same, neither would interchange for a direct swap. Trust me, I rebuild transmissions for a living.

kwhauck · 04-20-2009, 10:08 PM

good point, in my 5 speed swap i used a 94 cavalier bellhousing, but have the 3.94 gearset from a HO guad 4 tranny.......

Cliff8928 · 04-22-2009, 02:46 AM

Quote:

Originally Posted by buickboy71

If it came out of a 98 Grand Prix with a SC 3800, the bellhousing is for a 90 degree V-6. The 3400 is a 60 degree V-6. So without an adapter plate, it will not bolt directly to a 3400.

That's funny.. Because the chevy 60°V6 and buick 90°V6 in early FWD and all "3800" applications have the same bell housing pattern (so do some of the pushrod 4-cylinders too)

The Chevy 90°V6 (4.3 and 3.8) use the same pattern as the SBC. The pre 3800 RWD Buck 3.8 uses the old BOP bell housing pattern.

The Buick 3.8 is a 231 and the Chevy 3.8 is a 229.

kwhauck · 04-22-2009, 09:49 AM

leave it to cliff, the god of gm interchangeability to bring all that up!!!

cobrajeff92 · 04-22-2009, 06:00 PM

buickboy i know about the internals also. i do it for a living to at Aamco transmission