I rebuilt mine with help from my friend who used to work at Ralliart, even though everything went back in that came out the backlash was out and we had to adjust the backlash by re-shimming. He told me that its not that common and theres no explanation for why but its worth checking.

 

Great write up. Everyone... Thanks for the input. Respect.

 

hopethis can get answered here so futer questioners wouldn't have to look to hard .when installing a spool gear in the rear diff ,would the clutches and plated still b Needed?,
for those who dont know a spool gear basically replace the inside diff itself .

 

The installation instructions say to use a non-synthetic gear oil only. Are most of the people who installed these plate using a synthetic gear oil like AMSoil SVG?

 

I just use Diaqueen in it still.

 

quick question. Before I removed the drive gear from the diff case I did not mark how it was connected to the diff case. ( attached Pic from manual that tells you to do it )

Looking at the drive gear, Everything looks symmetric, and Im starting to think its not that important to keep it connected exactly the same way as from factory. What do you guys think. I have 2005 evo 8 GSR. When you took your out, did you mark it and reinstall it same way ?

I just made sure that marking on Diff Case match before the reinstalling them.

 

Good write up.

 

Bringing this thread back 4 years later. Can anyone confirm if the drive gear HAS to be lined up? There are no mating marks on the drive gear. Do you have to make your own first before removing or does it matter if it is put back rotated a little differently? As the poster said, it seems symmetrical.

 

Bump, I have the same question since I forgot to mark my ring gear before taking it off the diff. It looks 100% symmetrical other than the F 423 marking on the ring gear

 

There are machining tolerances on the shoulder of the ring gear, and on the PCD of the drilled mounting holes, which can cause it to run out by up to 0.003 inches. The idea of marking the original position is so you can replace the ring gear without changing its original run out, and thus saving the ring gear's teeth from any additional wear if it's reassembled in a different position with different run out.

 

Man a real revival thread. I completely tore ,t diff apart for sandblasting and cerakoting. I’m having a hard time with the drive pinion gear setup. If I torque it to the factory 137, the companion shafT doesn’t spin freely. I know most people don’t go this far with this mod but I would love some guidance from anyone in the know. Thanks !