Does anyone here know how to align the rear diff back up after you take it down? There is a sedan owner here who has a 4.083 final drive and I don't remember his user name.

I went by FP to ask but they were closed. And on my 350z there is a person who had a good write up on it but they said they didn't know how to align it. And they also said they had problems with the diff after the install.

 

what do you mean by align it?... You need to use a new crush spacer for the pinion gear to have enough pressure/pre-load... also proper shims are needed (and you wont know what size until install, so have many handy).

 

Great..Now I have to wait another week

 

If done incorrectly the results will be bad. Gear whine and possibly ruining the ring and pinion teeth.

 

You mean set the backlash and such?


Gears are one thing you should really have a pro do. You can really mess things up if you don't know what you are doing.

 

I can honestly say by looking at the FSM that I do NOT know what I am doing.

 

lol - yep, there's a bunch of stuff goin' on there... I've looked over the entire rear end in FSM a few times - its not a DIY for many ppl - certainly not me.

 

I think to get it right I first have to finish school and even then somehow still mess it up.

 

Been there, done that. Swapping gears is easy, but if you don't have the right tools to measure preload and shim size, there's no way the shadetree mechanic can do it. It's labor intensive, but really quite easy. Like others have said, leave it to the pro.

 

Better to have it done right the first time. I'm actually kind of disappointed with myself because I wanted to do the install all by myself.

 

Don't feel bad. I've rebuilt engines and transmissions and yet still can't set up rings gears properly.

 

The manual says that there should be between 3 and 5 thousandths backlash. The only way to make sure is to use a micrometer.

 

That is one I have not tried yet. +10 on the let a pro do it. Yes, it's not cheap for the labor but well worth it if there is a problem.