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Discussion Starter #1
Transmission Dimensions







Powerglide Ratios:
1st 2nd 3rd 4th rev
Powerglide 1.76/1.82 1.00 -- -- 1.76/1.82
 

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Discussion Starter #2
Identifying GM Automatic Transmissions

Sometimes it’s easiest to identify an automatic by its pan shape. Here, from left to right are the pans for the TH700-R4, the TH200-4R, the TH400 and the TH350.



1 Aluminum Powerglide 14 bolts
2 TH200 Metric 11 bolts
3 TH350 13 bolts
4 TH400 13 bolts
5 TH200-4R 16 bolts
6 TH700-R4, 4L60, 4L60E 16 bolts
7 4L80E 17 bolts
 

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Discussion Starter #4
Identifying a TH200-4R vs. TH200


The TH200-4R^^^ is identified by 10 bolt holes and 2 dowel-pin locator holes on the universal bellhousing. It has a dual bolt pattern for both Chevrolet and BOP (Buick, Olds, Pontiac) applications. The TH200 has only six bolt holes and 2 dowel-pin holes. :biggrin:
 

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Discussion Starter #6
Transmission Bolt Patterns:

GM rear wheel drive transmissions were cast with a number of different bolt patterns to mate to various engines. There are three common bolt patterns. In many cases, a transmission with one bolt pattern will not mate to an engine with a different bolt pattern without the use of an adaptor.


Above is the "Chevy" Bolt Pattern. The high center peak at the top is it's most noteable feature. Transmissions with this bolt pattern will mate to most Chevy engines (most front wheel drive engines used a different bolt pattern not illustrated here).

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Above is the "BOP" (Buick-Olds-Pontiac) Bolt Pattern. The depressed flat at the top is it's most noteable feature. Transmissions with this bolt pattern will mate to most Buick, Cadillac, Oldsmobile and Pontiac engines (most front wheel drive engines used a different bolt pattern not illustrated here).

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The third common bolt pattern is what is often refered to as the "Dual" Pattern bolt pattern. Or sometimes called the "Universal" pattern. Transmissions with this pattern will bolt up to engines with either of the two patterns above eliminating the need to use an adaptor plate.

The lower two bolts and the locating dowels are in the same locations for both the "Chevy" and the "BOP" bolt patterns. The locations of the upper four bolts is different. The "Dual" takes advantage of this and provides for mating to either pattern.
 

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Candies, flakes & pearls!
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Discussion Starter #9
Originally posted by hot$tuff5964@Aug 4 2006, 07:03 PM~5905316
damn this is a good post.
:thumbsup:  :thumbsup: for crenshaws finest
Thanks brother...

Theire's A LOT of things LIL is lacking that we really need to know or change. One of those is our lack of resources for mechanicle information. I'm just trying to do my part. I just hope these guys don't mess this up.
 

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iwa swondering if somone would have a answer to my question, i have a 85 cutlass that im swapping a chevy 350 engine into it, i have a th-200 so i will need
a adapter, but my qustion is do you know what crossmember iw ill need to place the tranny mount, and if i will need a different drive shaft.
thanks in advance
 

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Discussion Starter #18
Originally posted by mycutty@Aug 4 2006, 08:19 PM~5905548
iwa swondering if somone would have a answer to my question,  i have a 85 cutlass that im swapping a chevy 350 engine into it, i have a th-200 so i will need
a adapter, but my qustion is do you know what crossmember iw ill need to place the tranny mount, and if i will need a different drive shaft.
thanks in advance
You dont need a tranny mount-bar if all you're changing is the engine. Just make sure the trannys bolt pattern is compatable with that SBC350. See my pics above^^^
 

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Discussion Starter #19
Originally posted by layinlowusosixfo@Aug 4 2006, 08:17 PM~5905533
Why wont my th350 shift out of first gear?
Check you're linkage first. If thats not it, it's something internal and you'll probably need an overhaul.
 

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I hope it doesnt need an overhaul........I just picked it up from the tranny shop

Originally posted by Crenshaw's Finest@Aug 4 2006, 08:27 PM~5905574
Check you're linkage first. If thats not it, it's something internal and you'll probably need an overhaul.
 
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