Thanks guys. For those years there was a 55P and a 55T R&P sets. They were 8.2 and 9.375 respectively. The P is evidently passenger car and T is for trucks. Some info said the P was for posi but that's evidently not so.

Armed with that info I have searched the internet for a 9.375 55t ring and pinion set and haven't found anything yet. Anybody know of something available.
Randys Worldwide said gears are backordered and won't be in until after January 2022.

TIA
Jim


Jim

1955 Chevy series 2
6 cylinder, 3 on the tree
Short bed, step side