[Greg Reid]

What gears are in it now? 3:55s?

[Gator67]

Originally Posted by Greg Reid

What gears are in it now? 3:55s?

Yes, I believe they are 3.55.

I plan to change them out because the taller tires will only reduce rpms by 150-200 when cruising..In fact, I recently purchased what I think is a correct 3.08 ring and pinion set from a member here (I know I'll have to find an appropriate posi carrier too), but something puzzles me. The ring measure 8.2 inches across, there are 27 splines on the pinion, and I counted 40 teeth on the ring and 13 teeth on the pinion. I though I was good to go until I saw what seems to be an inconsistency in the stamped codes on the ring and pinion. The stamp on the ring is 40 13 GM 4 66 LO, and the stamp on pinion is 39 14 GM 4 66 TA. From my understanding 39 14 is a 2.78 gear set, and this wasn't available until 67, and besides, there are definitely 13 teeth on the pinion not 14. Either the pinion has the wrong stamp, or I'm not reading the codes correctly. Anyone have any insight into this?