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Chevy vs BOP trans pattern

Stomis

Stomis

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I know theres a different pattern for the old th350 BOPs vs the chevies and they wont swap but tomorrow I'm going to more than likely pick up a 86 442. I want to toss the 355 from the chevy in it until I have the dough to build a 455.

I google search yielded that the later model 200r4 transmission (the one in the 442) is dual pattern and will bolt up to the chevy 355. Any one have any info?
 
Not all of the TH2004R's are dual pattern. Some are. There are also dual pattern TH350's out there. That being said, they will bolt up to each other (just not all of the bolts), and you can run them together without an adapter.

Martin
 
If it has the original trans the 86 will absolutely have a dual bolt pattern bellhousing, the single patterns are pretty scarce and only used a couple of years in the early 80's. The 442 trans has a better servo design, different valve body calibration and high rpm governor. Probably one of the better factory 2004R's much like the Grand National unit.
 
I was under the impression that GM stopped producing B.O.P engines and just went with the Chevy small block in or around 1979. My mom had a 79 Olds Cutlass with a Chevy 305 stock and it had the TH350 in it.
 
snuffy74 said:
I was under the impression that GM stopped producing B.O.P engines and just went with the Chevy small block in or around 1979. My mom had a 79 Olds Cutlass with a Chevy 305 stock and it had the TH350 in it.
Click to expand...


No thats not right. It was either swapped or it was a 307. 90 was the last year for an olds motor in a Cadillac.


On the original subject, will the flexplate off the olds work on the 355?
 
Stomis said:
No thats not right. It was either swapped or it was a 307. 90 was the last year for an olds motor in a Cadillac.
Click to expand...


Well, it was a 305 and it did come from GM that way. I remember putting an oil pump in it with my dad, a starter and a few other parts and pieces for it and they were all for a 305.

But it is good to know that Olds made their own engines up until 1990, that I was unaware of. I assumed that they were just like the Pontiac division and stopped making engines in 1981.
 
GM used all their engines in the "G" bodied cars,from 78-82 when they had a labor dispite and some engine factories went on strike...if you bought an Olds Cutlass,it could have come with a 260,307,or 350 Olds motor,a 305 or 350 Chevy ,and Buick 231 V-6's...A Pontiac Lemans might have come factory with a Pontiac V8 or a Buick v6,or a Chevy 305/350--Buicks typically had Buick engines but I've seen a few with engines from other GM divisions..the good thing about these cars is just about any GM engine can be swapped in with a minimum of hassles ,all you'd need in the engine mount brackets to the frame,etc off the donor car..not all the trannies had dual bolt patterns but most of the TH350's and 2004R trannies did..
 
There were a lot of different combinations through the 70-90's in these things.

The "Corporate" case trannies, both 200R4 and the TH 350 with both patterns were very common.

I believe that the 350C (lockup TC) was also available with a dual bolt pattern case.

This all came about when GM ran into labor issues and engines for the different models fell short of production quotas.

They then installed the Chevy small block into a lot of the different models.

This created a firestorm due to customers that bought a Caddy bitching because their Caddy had a Low life Chevy engine :eek1: instead of a Caddy engine.

GM then made it a practice of anouncing on every vehicle (Sticker) that the vehicle had an engine made by GM.

Never could get around that one. Ford makes all the engines for Ford, Lincoln, Mercury and so on and no complaints.

But put a Chevy engine in a Caddy or an Olds and the worlds gets all bent out of shape. :rolleyes:


The only way your going to know if your tanny will fit to the Chevy engine is to get things loose and Look at it.

OHHH The TH 400 was never made in a "Corporate case"

Here is a link to some pics of the different patterns http://tech.oldsgmail.com/trans_bp.php

Snowy
 
Snowy Rivers said:
There were a lot of different combinations through the 70-90's in these things.

The "Corporate" case trannies, both 200R4 and the TH 350 with both patterns were very common.

I believe that the 350C (lockup TC) was also available with a dual bolt pattern case.

This all came about when GM ran into labor issues and engines for the different models fell short of production quotas.

They then installed the Chevy small block into a lot of the different models.

This created a firestorm due to customers that bought a Caddy bitching because their Caddy had a Low life Chevy engine :eek1: instead of a Caddy engine.

GM then made it a practice of anouncing on every vehicle (Sticker) that the vehicle had an engine made by GM.

Never could get around that one. Ford makes all the engines for Ford, Lincoln, Mercury and so on and no complaints.

But put a Chevy engine in a Caddy or an Olds and the worlds gets all bent out of shape. :rolleyes:


The only way your going to know if your tanny will fit to the Chevy engine is to get things loose and Look at it.

OHHH The TH 400 was never made in a "Corporate case"

Here is a link to some pics of the different patterns http://tech.oldsgmail.com/trans_bp.php

Snowy
Click to expand...

Thanks for the info. I'm gonna get under it this week and see if theres bolt holes that arent used. Either way if its a single pattern I'll just get an adapter.
 
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