what is the best way to find out what gear ration i have in my chysler 8.25 rear end? and dana 30 front end. im wanting to regear for 33's

 

mostly the manuals have 3.07's, auto's have 3.55's. but there is a metal tag on the diff's that have the ratio stamped on them to find out.

either way it wont matter to much as for 33's you will want 4.56's. and to do that you need a new carrier or thick gears for the front. the will depend on if you have either the D35/C8.25/D44 as to what you have to do. but you don't always have to replace the carrier, you can get thick gears so that you can reuse your current carrier.

 

Scotch your front tires and jack up one rear tire. Put the tranny in neutral, spin one tire one complete rotation and count how many times the yoke turns. If it turns 3 times it's 3.07, three and a half 3.55s and so on. You'll need a new carrier for the front reguardless and if the rear is a 8.25 there is no carrier break so all you need is the gears and install kit.