broken ring gear!!! questions

[BurnoutNova]

i have a 71 K-10, with the normal 12 bolt rear...and yesterday i notice a hole in the rear end cover, leaking fluid. so i thake it off and some teeth are in the bottom of the case.

so i need new gears. on the ring gear it says 3817779- 14:43 GM 8-68

so im thinking it has 3.07 gears. but i was told 4x4's have 3.73's either way, any tips/advice wopuld be great for when i go to change the gears

i was going to order the gear set and a pinion bearing. what else do i need?

thanks, zach