What rear end ratio originally came in a '72 Cutlass with a 350 engine ? I'm going to put a 700R4 in mine and don't want to have to change the rear end, but am concerned it could be too low for the overdrive.

 

You'll find all the gear ratio options in the 1972 SPECS booklet on Wild About Cars.

http://wildaboutcarsonline.com/cgi-b...aldisplayed=26

Wild About Cars. http://wildaboutcars.com. An information supersource, especially Oldsmobile. More Olds content than anywhere else on the internet and continuing to grow.
You'll find Chassis Service Manuals, Product Information Manuals (AKA Assembly Manuals), Inspector's Manuals, and other documents that will contain this and much much more.
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I've had three '72 Cutlasses (350 2v, 4v and 455 4v) and all came with a 2.73:1 ratio. Of course, you'll have to check to make sure.

Wildaboutcars is a great source for that info and plenty more if you register.

 

The most common ratio I've seen in 72 Cutlass's is 2.73
with 350's and 455's but like 72 w29 all green said you'll have to check to be sure.......

Johann

 

Thanks to all. If it is a 2.73 it will never work with 700R4. Been there, done that. I'll start looking for a set of 3.42's. Thanks again

 

My 72 Cutlass supreme Has 2.56 Tail gears its a 350 /Auto, In the process of rebuilding rear end now

 

That's interesting because in 72 the 2.56:1 gears weren't offered for any of the A bodies, however it was the standard gear for 1971 CS with AT. Is your car by any chance a very early production car? You can tell by the VIN and the cowl tag build date.

 

Not sure Allan, just got the car . I will check tomarrow on that , I was suprised that they were so high.

 

I also had 2.56's in my '72 Supreme (so I was told by my mechanic. I never counted teeth). She was built in Nov '71.