block727

Hello I am new here. I am looking into a 1970 Cutlass with a 350-4bbl 4-speed. My question is how can i tell what transmission is in the car?

olds 307 and 403

It should be a TH350 in 70.

70W-32

Not if its a 4 speed.

It will be one of the Muncies

joe_padavano

The wide ratio M20 was the only four speed offered in the Cutlass in the 1971 model year. Of course, if it isn't the original trans, there's no way to know for sure without taking the trans out and inspecting it.

Vintage Chief

What about the 1970 model year?

69CSHC

Welcome aboard, is it just Cutlass or an "S", or a Supreme, etc ?


Its my understanding that for 1970, Supreme's could come either Muncie M20 or M21. Not sure about other versions.


Block727 this may help. https://www.hotrod.com/articles/guid...transmissions/

joe_padavano

DOH! Sorry, for some reason I read "1971" in the original question. For 1970, both the M20 and M21 were available. I am not aware of a foolproof way to tell them apart from the outside. Sorry I misread the original post the first time.

block727

Thanks , the car is an S,having it appraised this week.

block727

Thank you for the info.

2blu442

If its the original transmission it should have the vin derivative stamped into it, that will increase the value. Then there's another code stamp, I believe 4 or 5 characters long. The first digit will be a P and the last digit will be an A or B. The A would be for a M20, the B and M21. This assumes that nobody has been inside and changed things.

Let us know how it works out. If you do buy the car share pictures of it for us!

John