the trans behind my 350 has the codes BB stamped on it. it is a turbo 350. i pulled the motor out of a 72 skylark custom 4dr with a 350 2 brl. i was wondering if this was the original trans or not. car had 90,000 miles on it. Thanks Jeramie
On a Buick THM350, the VIN # is stamped into the drivers side of the case just above the oil pan flange. If the VIN matches the car VIN, you have the original transmission. Where was this "BB" stamped?? The THM 350 had calibration codes stamped all over, depending on what GM car it came out of.