[gtoformula]

I have a Fremont built 1970 that came with 3.55's, but someone pulled them out long before I bought the car. I put 3.55's back in, but found that the engine spun way too high for my preference on the highway. I put in a 700R4, but the 2004R is an easier install. Either trans can be built to take Pontiac torque. All the trans shops you mentioned are good. I went with Phoenix Trans. Expect to pay in the range of $1,750 inc. converter. That is just the trans. You will need to purchase or perform the labor plus any driveshaft, mount mods. You'll like the final product. You end up with a lower first gear for better launch plus much lower cruising RPM at 70MPH.