Originally posted by Pappy1
I need some help in setting up a ring and pinion on a 9" with a spool. Thanks in advance for any help

you really need some live help, but if you gonna do it anyway you need a, in.lb., and a ft. lb. torque wrenchs and a dial indicator for checking the r/g backlash. use the same inner shim that was under the old inner pinion bearing and that should give you the right pinion depth, then tighten the pinion nut down untill you get the proper pre load on the pinion bearings, add your ring gear and use the dial indicator to get the proper backlash, and then tighten the carrier nuts to the proper bearing pre load. if you use the old inner pinion bearing shim that should give you the right pinion depth and then when you get the proper backlash in the ring gear and pinion the dif. should be right. you should at least get a good book on it, bacause if its not right it want last long. i dont know what the spec are because i all ways did it by looks and feel. and before somebody tell you i dont know what im talking about ive built them for yrs. and ran a modfied. race car a few yrs that used 9" fords and had 10 if them set up for dif. tracks all over the east coast and never tore one up. thats a good test for a dif. ,getting the pinion depth right is the hard part but if you use the shim they use from the factory(its .010 thick i think) thats all ways worked for me.

the spec are...
back lash .005"-008"
brearing pre load 20-25 in. lbs.