ok, here are my questions...
1. would the eaton posi unit work for my car...76-88 car/truck 7.5" ring gear, 26 spline-3.23 up ratio
2. i want to put 3:42s in my car, would the gears work with the posi unit??
3. do i use these gears...gm 10bolt...7.5/7.625" diameter ring gear/1.438" diameter 27 spline pinion....and what does it mean when it sias 3.08 and lower carrier, and 3.23 and higher carrier


do all these parts go together??? and can i put them in myself, i know i can, but what tools are required to do so and how would u do it????? 85 camaro

 

1. If your car has a 7-1/2" 10-bolt, and the 10-bolt is 88 or older, then yes, that carrier will fit.

2. 3.42 is higher than 3.23. Therefore those gears and that carrier are compatible.

3. Yes those are the correct gears for one of these rears. The carrier for 3.08 ratio and lower (known as "2 series") has the mounting surface for the ring gear in a different place from where the carrier for 3.23 and higher ("3 series") locates it, because the lower ratio gear sets have a larger diameter toothed area on the pinion.

4. You need some method of measuriong how far into the housing the pinion extends, measured against the centerline of the carrier bearing saddles; to be meaningful this measurement must be accurate to within .003" or so. An inch-pound torque wrench is helpful, since you must tighten the pinion nut (thereby crushing the crush sleeve) after you have correctly shimmed the pinion bearing, until the torque required to turn the pinion is about 18-24 inch-pounds. You need a tool to hold the pinion yoke still while you tighten the nut, and a socket arrangement to tighten it, all of which needs to be able to apply at least 200 ft-lbs to the nut easily and in a controlled fashion. And you need some way of measuring the backlash between the ring and pinion, which should be st to around .006" - .010".