200 4R - which bell housing is best ?

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81cutlass

Comic Book Super Hero
Feb 16, 2009
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I have owned 3 200r4's and have never seen one that is not dual pattern.

Th350 came bop or chev and th350c had dual pattern.
 
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pagrunt

Geezer
Sep 14, 2014
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In my (hopeful) future project parts stash I have a uni bell TH200-4R that was in my parts car '86 Monte w/ a LG4.
 
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64nailhead

Goat Herder
Dec 1, 2014
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We have 2 and both are the same pattern as posted 565's pic. I thought all were like that as 81cutlass mentioned.
 
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565bbchevy

Geezer
Aug 8, 2011
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neither one is any better get which ever one fits your motor
Not necessarily better but I would rather have the option to run either a BOP or Chevy than be limited later if I decide I want to go a different route and not need an adapter to do it.
 
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Cuse99

Master Mechanic
Dec 21, 2020
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Thanks - I got my trans today. Its a core and it will be rebuilt as new with some upgrades. A few weeks based on his schedule and hopefully in a month I'll have a new trans with overdrive. I'll save the current trans pulled from an '84 monte carlo ( TH350) incase some one wants one in the future for a restore. Making progress.
 
Oct 14, 2008
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Melville,Saskatchewan
I have owned 3 200r4's and have never seen one that is not dual pattern.

Th350 came bop or chev and th350c had dual pattern.
The TH350 in my 70S was dual pattern.
 
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oldsmobile joe

Royal Smart Person
Nov 12, 2015
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i have two 200-4r that came out of olds powered cars and one that came from a monte ss. all are dual pattern.
 
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gnvair

Royal Smart Person
Sep 1, 2018
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Southern New Jersey near Philly
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.
 

Jim Rockford

Master Mechanic
Nov 10, 2007
308
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Shelby,N.C.
All 2004rs have the dual pattern and No removable tailshaft. they never made a chevy bolt pattern only , or a BOP only pattern.
 
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