I just looked at a 72 Buick Skylark that has a 1970-1971 455 transplant in it. I could not get under the car to see what the trans was TH400 or TH350 however I could see the trans tag and it shows a large B then small numbers and then a large 1. What trans is this a TH400 or 350? Thanks Tim
If it has a tag, it's probably a 400. Take a closer look, there should be 2 letters, like BA, BB, BC, BT List all the numbers on the tag. The vacuum modulator on a 400 is at a right angle to the case, and the pan is irregular shaped. The governor is behind a cover with 4 bolts.
