200 4R - which bell housing is best ?

[olds307 and 403]

From my own experiences, only the early 200 4r transmissions had BOP or Chevrolet only bell housings. In all my years around these cars I have only seen one that wasn't dual pattern and it was a BOP pattern All the later ones had the dual pattern. I personally would be hesitant to start with one that was single pattern knowing that it is an early one and does not have a lot of the factory upgrades that were made over the years.

Have you seen the Chevy only pattern?

 

[olds307 and 403]

All 2004rs have the dual pattern and No removable tailshaft. they never made a chevy bolt pattern only , or a BOP only pattern.

Supposedly they made all 3, BOP and Dual with the Chevy pattern the rarest. I have heard eyes on the BOP pattern but no one has claimed to see the Chevy pattern in person but I spend my time on Oldsmobile sites. I was surprised my 70 Cutlass transmission was dual pattern. I am surprised GM bothered casting both patterns separately. A dual pattern makes the most sense cost wise.

 

[pagrunt]

I am surprised GM bothered casting both patterns separately. A dual pattern makes the most sense cost wise.

There, I made it easier to see the problem on that idea.

 

[gnvair]

All 2004rs have the dual pattern and No removable tailshaft. they never made a chevy bolt pattern only , or a BOP only pattern.

They certainly did make a BOP only as it was used behind those engines first. I have had hands on several over the years. I believe Chevrolet didn't start using them behind their engines until 84-85. Chevrolet was using the 700r4 on the Corvette in 1981 and then used it on the full-size trucks and B bodies. The 2004r use was mostly in Monte Carlo and El Caminos. The only B bodies I have seen with the 2004r were the 307 Oldsmobile powered ones. I have never seen a Chevrolet powered B body with the 2004r; but just because I have never seen one doesn't mean GM didn't build any.

 

[Cuse99]

From my own experiences, only the early 200 4r transmissions had BOP or Chevrolet only bell housings. In all my years around these cars I have only seen one that wasn't dual pattern and it was a BOP pattern All the later ones had the dual pattern. I personally would be hesitant to start with one that was single pattern knowing that it is an early one and does not have a lot of the factory upgrades that were made over the years.

Not a concern for me. When my trans guy rebuilds my 200, he will add upgrades we already talked about. Not a big event for him cause I'm only looking to support 300 hp, but he said the trans will support up to 450 just incase I upgrade in the future.

 

[gnvair]

Have you seen the Chevy only pattern?

Never

 

[Ribbedroof]

Given GM's mindset regarding the move to "corporate" mentality at the time, it wouldn't make sense to make a Chevrolet-specific case, especially if they had already developed the "corporate" case from the BOP case.

I've never even heard of a "Chevrolet" 2004r case before this thread

 

[olds307 and 403]

Joe Pavandino mentioned it on Classic Oldsmobile but has never seen the Chevy case in person. GM may have made them or they could be like a solid main 403. Should we put out a reward for one, like the solid main Olds 403?

 

[Ribbedroof]

Might be that a drawing for it exists, but was never released for production. Kinda like the tripower SBC.

 

[81cutlass]

Or the non window main 403.

One of my 200r4's came out of a 88? 305 SBC caprice.