I have a 71 cutlass and considering an overdrive, my question is would it be better to use a 200-r4 out of a 83 cad coupe deville or a th700 out of a 90 cad broughm? the 83 trans only has 41k miles and the 90 has 87k but I was going to have either one checked and serviced. I have acces to either at a cheap price. and the second question would the extra gas milage when I will only drive it a few thousand miles a year be worth it?

 

Neither trans will survive very long in stock condition. The 200-4R will be the easier swap.

 

x2

Neither trans, in stock form, is designed to take on high horsepower engines, especially the 200R4. The 700's were used more with Chevy 350's and as such would hold up better but it still would need to be beefed up to handle any abuse. Also, the 700 would need an adapter plate from Summit to bolt up to an Olds engine.

 

the 700 is bolted up in a 90 Cadillac Fleetwood, wouldn't it already be adapted to a B O P bolt pattern? I pulled the 200 out of a 1983 Cad Coupe deville and it has the multi-fit case with both sets of holes. Does anyone sell a beef up kit for a 200 r4? I am only running a 350 with a mild cam, not high horsepower, and the car can't weigh as much as that huge 83 cad.

 

Look again - that Caddy has an LT1 small block Chevy in it. There has NEVER been a 700R4 case made with a BOP bolt pattern.

Two sources for 200-4R parts are:

http://www.ckperformance.com/resourc...4RCATALOG.html

http://www.200raptor.com/#Level%201