Just completed a LSD total overhaul, Not difficult at all. One thing that I found out that causes that annoying rear-end whine sound is the bearing that is working around the gear shaft that meets the crown gear. Mine was totally messed up the rollers severly damaged. The clutch disks cost my $80 at mazda. Simply swap them. I replaced the wheel bearings also but they were still good, that was the hardest part. Now it feels like a new car, and the lsd disks made a huge difference. It's the same design as the camero lsd diff. It took 4hours to do, not including the wait for the parts to come in.

Then I got a new driveshalf, and the car is vibration free. It feels like a new car. It's 1984 all over again!! LOL

Also did my exhaust over with a resonator and a new cat, the car is quiet too with no backfiring. It's so amazing.

 

what front end do you have on your car? i want it baaaaaaaaaddd!!! also is it a whole kit or could i just get the front end?

 

The front end I believe it's the factory IMSA package, most of the rx-7's I've seen only have the front skirt. Mazdatrix and racing beat sell them separatly. Mine is a 3 piece front skirt.

Some guys on the forum have the full kit, side skirts, wing, and back bumper. I used a 5.0L rear bumper. Side skirts are gonna be put on in the winter along with a aluminum wing to finish off the look.

 

Good you caught the Whine early.
I had a loud whine coming from my rear end and couldent figure out what it was. until I was racing a riced out little civic (smoked him pretty good) and my rear wheels decided to lock up at 80Mph for about 100ft. Kinnda Scarry.

 

Some older GM cars needed whale oil for their LSDs to operate correctly and not whine.

 

Was there very much dissasemby just to replace the clutch discs? My diff doens't whine but the lsd is not working. I can do most of the moderate repairs on my car so do you think I should take it to a shop do get done or try it myself? Thanks.

 

Rx7 nut,

The only hard part about disassembling the actually LSD diff is adjusting the teeth on the pinion and crown gear. Other than that it's easy.

When you take it apart where the wheel shafts slide out are these adjustment on both sides, you'll know them when you see them cause they have a lock on each side held with a bolt. The whole goal of this is to make sure the 2 gears mesh nicely together and all you have to do is get white-out and paint a section of the crown gear. Then spin the pinion gear and the goal is to adjust it till the gear removes the white out evenly(most surface of each gear touching, to prevent the gears to wear out). But a performance shop can adjust it for you if you have trouble.

To get to the clutches you must remove the crown gear and underneath is the screws to take it all apart.

P.S. I found out from a ex-mazda mechanic that the dealership won't bother. They'll tell you it's too old or to just buy a new LSD.

I encountered that problem so I had to call around to 4 different dealerships in order to get the clutches. Alot of the parts guys don't know what they are, one dealership had 2 parts guys and one said that they didn't make them anymore and the other guy got them ordered and shipped to my shop..... big difference!!

 

Noticed u mentioned u used a 5.0 rear bumper. How well does it fit and which bumper cover did u use the lx or the gt? Does it require any serious modifications?

thanks,
matt

 

It fits pretty well acutally... I used the GT bumper. The only serious modification is making it narrower. i did that by cutting it down the middle and removing about a 3 inch section.

Check out my web site for pictures of the bumper on the car.
www.portugesethug.homestead.com/jim.html