What does the absence of the VIN on the pad indicate? A service replacement? Could sand blasting the case have caused the VIN to disappear? I thought all 70's era transmissions got VIN's stamped on the case whether it was destined for a passenger car or truck. Last year I bought a 1970 U-code Cuda with its original 440 engine. But the 727 transmission has a 1975 part number and date code. There is no VIN on the pad. It was DOA and needs to be rebuilt.
I am not sure whether it is a worthwhile endeavor to find a correct 670 transmission for my Cuda. Did the exterior design of the case change from 1970 to 75? Are there any noticeable visible differences? I could always get my transmission rebuilt to 670 specs.
Whats the availability like now on 670 TorqueFlites?
A 670 is a lot easier to find than a 671 or 672. As for case differences I doubt there are any major differences.
It's really up to you if you care about the correct part number or not.
