I dont have the gpm pinion because i bough the ring gear on its own to try out first. I didnt know the gears teeth would be a different shape then the stock teeth. As posted earlier, there is a whole diff gear set that gpm makes but its out of stock in a lot of places. Im going to buy the pinion and spider gear set as soon as i can and ill post about them.
I still have a ways to go before i got all the parts i need for my truck so i might be awhile. Hoping to have it running by new years X)