gear question??

[Rybo50]

Im putting a 373 gear on my car hoping for a supercharger later. My question is what do i need besides the gear kit and speedcal. My car only has 19,000 miles on it and im thinking a shim kit or something. what do i need and where to get??

 

[1low03gt]

You need the shim kit,crush ring,pinion nut,axle seals while you are there,and i wouldn't get the speedcal,go with a chip or a hand held tuner,they both can fix the speedo too,and plus you get more for your money with a chip,or hand held tuners as you can tune your stang aswell. Spend your money once,not twice.If you buy the speedcal now,then later decide on a chip,or tuner,you've just wasted a few bucks .