Ring and pinion size

[chas0218]

How can I determine the ring and pinion size of my current truck? I want to purchase a richmond powertrax locker but don't know for sure the ring and pinion size. I can tell you my truck is a 2003 silverado 1500 Z71 4wd with 3.73's it does have a larger pumkin than non Z71 but is still a 10 bolt. I am guessing its a 30 spline series 3 carrier 8.625 but want to be sure before ordering the locker.

 

Thanks,

Chas

[Chris]

8.625