as the title says someone told me i cant use 3.73 richmond gears that im getting on a stock posi that came out of our cars. i mean either way im gunna get them off cuz there brand new and my brothers doesnt have anything to put them in so he just wants me to pay shiping but im just wondering this cuz im gettin ready to put a posi with stock gears

 

You will need either a gear spacer or the correct 3-series Posi. The offset of the ring gear is different between a 3 series (3.23 and up) and a 2 series (3.08 and down.)

 

The "posi" is just a carrier. Whether you can use the gears or not depends on the series of the carrier. The 3.73 gears are probably for a 3 series carrier. If you have a 2 series carrier, they won't fit.

What gear ratio is currently on the posi?

 

i think they are 3.23 or 3.43 something like that if i remember right how can i be sure aobut that and how can i figur out what seires posi i have, it is out of the car just sitting around right now and

 

pull the cover and do the math to see what gears you have then you'll know what series carrier it is. either the gears will work as is or you'll need a spacer for the ring gear, one way or another the gears will work

 

k i get that but what if there were no gears on the carrier, then what do you do?