Does anyone know if I need a large bench vice clamp to clamp my axle on then put the carrier on to work on it? It says it in the "Servicing 9-Bolt (Borg-Warner) Limited Slip Units" in the Tech articles, and I am curious to why I need to. Anything I could do instead?

Do I really need to do step 4 and if so, Why?

 

Anyone know?

 

Never serviced a 9 bolt, so I can't say.
This thread has a bunch of good info about rebuilding a posi in a 9bolt, unfortunately it looks like the pictures have disappeared.
Maybe it'll help anyway
https://www.thirdgen.org/forums/susp...highlight=.005

 

It helped a little, I am just curious to why I need to get a vice and make my axle point straight up then put the carrier on it? I don't get why I need to do that.

 

could be just to give you a work stand so you can apply serious torque to the bolts, for disassembly, reassembly. better than putting the whole posi in the vise.

for Eaton posi's, it's very useful to have a stub axle to impale the posi on your vise.

FWIW.

 

I have a BW assembly. I was thinking that is has to be on the axle to keep something aligned or in order or something. I dont know.

 

it explains why you do it in the re-assembly. The parts inside are splined and separate. By putting the axle in place, you effective line up everything so that you can re-assamble once its back in the housing. If the splines don't line up, the axles wont go in once the parts are assembled and spring loaded.

you don't HAVE to put the axle in a vice, but it sure does help. you could put everything together sideways on the bench, but its MUCH easier to build in vertically.....and when you do this, make sure you put the other axle in as well. they both are used to align everything.

 

I agree. Just did this a couple of weeks ago. I don't know that it could be done without a BIG strong vice. The posi/differential parts stack up in a precarious way, then you have to lower the upper half of the carrier assembly (with an axel sticking out of it!), compress the internal springs and start the 8 carrier bolts and torque them. If anything moves while you're doing this the carrier halves won't line up and you can't start the bolts. Heck it took me a couple of tries just to get it all lined up.

Also, do a search cause I just posted a link to a reallly good article that goes further than the one in the tech section. It describes how to modify your cones to "re-claim" them. Worked like a charm for me.

BTW shimming to 0.0" play worked perfectly for me. The hardest part of the whole thing was locating proper shims. I got a mechanic at the local Ford dealer to give me some pinion shims out of his tool box. I can't tell you how much better the car performs with a tight posi. This is one of the best things I've done lately. Cost me about 20 bucks.

 

Dang, I just bought alot of shims for 60. Oh well. My posi isn't working so if I shim it it will definately be an improvement.