Bellhousing bolt pattern, 3800 Series II? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-03-2006, 05:03 PM   #1
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Default Bellhousing bolt pattern, 3800 Series II?

Does anybody know if the 3800 has the same bellhousing bolt pattern as the older cars with RWD?

I've got a chance to buy a Cosworth Vega with a dead engine (cheap) and it occurred to me a 3800 supercharged car would be a lot of fun.
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Old 02-03-2006, 06:54 PM   #2
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FYI the Camaro and the Firebird used the N/A Series II
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Old 02-03-2006, 08:01 PM   #3
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Thanks, I didn't think of them.

What I'd like to do, however, is stay away from the electronic transmissions in favor of a turbo 200 or turbo 350.

Anybody have any idea if the bellhousing bolt patterns are the same?
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Old 02-04-2006, 01:38 AM   #4
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Well the 200r4 bolted up to a grand national mack in the 80'*, and as far as i know the bell housing of the 3.8 hasn't changed since then (i've been known to be wrong, however). Find yourself a goot 200r4, maybe even a core and rebuild it, and you should be good to go. The only thing you should have to hook up is the TCC wires and the TV cable <--- that may be a tad tricky.
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Old 02-04-2006, 07:13 AM   #5
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I don't know if they will help, but call an AAMCO and ask about this compatibility isue.
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Old 02-04-2006, 05:55 PM   #6
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Keep in mind also that the 200r4 is a piece of junk. Stick with a turbo 350.
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Old 02-05-2006, 01:01 AM   #7
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Quote:
Keep in mind also that the 200r4 is a piece of junk. Stick with a turbo 350.
Wrong information. A 200R4 will perform flawlessly when built right; it was the standard trans on the Buick GN and GNX and there are lots of those transmissions running low 10.0'*. Also, the T350 will not bolt to the 2.8/3.1/Series 1/L/2 or 3 engines; it will bolt to the early Buick 3.8 engine only. 200R4 was available on the 2.8 engines on the *-10 trucks and Firebirds.
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Old 02-05-2006, 10:54 AM   #8
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If I'm wrong, then what transmission is used on late 80s Caprices with the 5.0? I could have sworn it was the 200r4, and I've had a number of transmission shops tell me those are pieces of crap (this was after dealing with a failed tranny in a customer'* car)...
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Old 02-05-2006, 01:48 PM   #9
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Quote:
Originally Posted by CSFiend
If I'm wrong, then what transmission is used on late 80s Caprices with the 5.0? I could have sworn it was the 200r4, and I've had a number of transmission shops tell me those are pieces of crap (this was after dealing with a failed tranny in a customer'* car)...
The 2004r can be built to withstand quite a bit... Totally stock it was junk... Have seen the mass majority of them fail early on..

I think you are thinking of the 700R4, not a bad trans, it too could be built, but at the same time and in all fairnedd it too had its share of problems... The 2004R and the 700R4 were the early Overdrive Transmissions... But just like a turbo 350 or Turbo 400 they can be built...

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Old 02-05-2006, 04:40 PM   #10
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Many of the late model GM big cars had a T350C, which it was the overdrive/lockup version of the T350. The T350C is a real piece of junk. I had one on a 1986 Olds Station Wagon with a 307 Olds; I replaced it with a standard T350 and made a big difference in performance and mileage too. My neighbor also had a Caprice with a 305 Chevy that had the same T350C trans too.
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