to make a long story short....i damaged one of my wheels and the cradle arm and my mech said that he would advise to change the diff cause it seems like it took a good blow in the accident and most likely will have internal damages!
anyways, got a used diff(with no guarantee) for like $850.
put it on...and it makes this knock sound during shifts.
i know it did $hit by buying a used diff...but it's too late now.
anyway $850 is alot of money to throw down the drain so i was wondering if u guys think that it could be fixed somehow.
also, what is the worst case scenario? will i just have to end up throwing it away?

if i could just fix it and sell it...and at least get back some of my money...i will be happy.

thanks guys!

 

Most rear diffs require shimming to have a correct fit (even from the factory).
If the diff is too loose it will make a knocking sound on deceleration or throttle lifts.
If it is too tight it will wine

regards,
aaron

 

You need someone who knows how to set a rear properly (mainly pinion depth). buy a set of gears (ring and pinion) for it and have them installed and set.
Naturally find a good guy to set them before you buy them.
I know one of the best at it but I am in the US so that probably doesn't help.
Getting the depth just right is more of an art then anything.

 

setting the proper contact patch on a ring and pinion is not an art. Its a process of finding the biggest and most even contact pattern between gears. I use good old wheel bearing grease. You try and find a shim that will set the pinion at a proper depth so as to give an even pattern. Any qualified tech should be able to do the job correctly. good luck!

 

thanks guys..will look into it.

 

That is my point exactly, that is not the proper method. It's one thing to put it together and have it not make noise, it's another to have it last like that for 100,000 miles or so.