Hello all,

I am going to swap a series II 10 bolt rearend into my car that has a series III 10 bolt rearend.

The reason I am doing this is because the car now has the standard diff with 3.73 gears/pinion (which is a good gear ratio) but, I would like a posi reaerend. I was able to get an 86 limited slip differential with new Richmond 3.42 ring/pinion gears, the matching installation kit for a series II carrier and the series II carrier with drums attached for $150, so I snatched it up. I got the original pinion gear and ring with it as well and is mostly disassembled.

How difficult is it to get the new rear end in the car so that it is straight, so the car doesn't look like it is going left or right when it is actually straight?

Does it line up pretty easily?

I also had a question regarding the backlash setting for the ring and pinion...

I am sort of confused after looking at the instructions posted by a fellow TGO member as to where to measure the play. Correct me if I am wrong but, It looks to me like if I set the diff in the carrier and bolt the hangers there wont be any play front to back with the diff... Right? This makes me think I would measure at the end of the pinion gears shaft. Am I way off here?

Where is the backlash measured and which direction is the play (i.e. front to back, side to side, up and down etc...)?

Thanks,

newZman

 

Here are some pics of the stuff I got;

If I get this right

The whole kit + diff and ring/pinion.

 

Torque arm holds the rear position up/down (yoke relative to tranny, so the pinion angle is correct). Lower Control Arms hold the rear straight with the car. Panhard bar holds it centered left to right. Unless any of those are adjustable replacements on your car, there's only one way to put the rear end in, and that is straight.

 

Excellent that's what I wanted to hear. Hopefully I cant mess it up then.

 

Nope - can't really mess up the install of the rear end. Springs will fall out, use electrical tape to hold the rubbers on top of them when you replace them. Replace swaybar endlinks while under there as well.

I know nothing about the shimming of the internals, but there's posts here about it, try a search. Good Luck!

 

https://www.thirdgen.org/forums/tran...axle-gear.html

 

Thanks big gear head, I'll be checking that out, from what I have read so far I like the quality on this instruction better. I may still have some questions.

newZman