OK, I have a 2.73 open rear end. I was wanting to go to a 3.42 gear with the SLP posi ($99 one). Do I need to order the 3.42 gear that is for the 3.08 and lower carrier and what does it mean on the posi when it says this is a 3 series differential. Is this all I am going to need the gear and posi??? Just wanting to know before I order and get the wrong thing and have the car sitting in the shop for 2 weeks while I am swapping out for the right parts.

 

3 series means that the differential is sized to use actual 3-series gears, not the special ones. So you don't need the ones for the 3:08-down carrier, because your new carrier (aka posi, differential, etc.) is 3 series.

You need a gear install kit, which comes with all the shims, bearings, and some new ring gear bolts; it wouldn't be a bad idea to buy either the axle bearings and seals, or the "deluxe" kit which includes them, because then every single wear part in the rear will be new; and fluid, I highly recommend synthetic.

Additionally, a "crush sleeve eliminator" or "solid pinion spacer" makes assembly alot easier since with one of those, once you get the shims selected for proper preload you can tighten down the nut as tight as you want; and maybe one of the "stud girdle" type of covers if you're going to be putting any sort of real power to it.

http://www.drivetrainspecialists.com...=28&cat=GM+7.5 Here's a good source for all the parts you need, besides the posi. Gears, kits, spacers, cover, etc.

 

I will need the posi from slp, the 3.42 gear for 3.23 and higher carrier, deluxe gear installation kit, crush sleeve eliminator and a stud girdle to really do the job right. One more question do I have a 7.5" 10 bolt AKA 7.625". Be patient with me I am still learning.

THANKS!!!!

 

The stud girdle is not necessary, especially since you're a 305 TBI. It is a good idea though, if you have an extra $125. And yes, you have the 7.625 10 bolt rear.

 

I am hoping to have a new engine in by summers end probably 300 to 350 HP nothing great just something to cruise in and show off a little. You know what I mean.

 

In that case, yes it would be a very good idea to put on an aluminum support cover with the stud girdle kit. Welding the axle tubes would also be a good idea.

 

Thanks for the answers much appreciated

:hail: