i'm having a humming sound from the pumpkin with the Quaife I just installed. I got it swapping my pumpkin with open diff to this one with the Quaife and with some sort of aluminum rings were mine used to have bushings. This pumpkin was in a 350z Racecar used for T2 (or T3, don't remember) circuit. my mechanic told me to change the oil and add an additive from GM. my other mechanic told me i was phucked, basically, because it was the final drive and there was nothing i could do about it.

what do I do? Is that humming forever? should I go back to my open diff and pay labor again? The humming gets louder if I accelerate and its constant. Pretty annoying. I'm so bummed, did know an LSD would be this horrible.

 

Hmmm, sounds like the gear lash setting to me. However, I could be mistaken.

You can setup the gear lash on the ring and pinion a couple different ways. If you set it just right, you won't hear anything. If you set it aggressively, it will be noisy. Again, if I am not mistaken, the agressive setting gives you a better bite.

By the way, if it is gear lash, you would have to have someone re-shim the gears to set the correct lash. Not cheap.

 

sounds like gear lash to me also?

 

The whole pumpkin was on a race car. There is a very good possibility it had an agressive setting. It even has aluminum rings on the outside where it used to be rubber bearings and the cover has vertical lines for cooling. My guess is it also has the final drive 3.9 because it revs like a mad dog now.

 

Used and abused?

The most difficult precision job is getting the gears set correctly inside a diff so they will last 200,000 miles............takes all day by an expert........the quick and dirty last 30k and are very noisey!

A racers worry about is lasting thru the race.

 

What does that mean? Is mine installed quick and easy? Abused? I thought Quaifes were the shiet.

 

I think I know why it humms

It doesn't know the words

had to be said

 

Thanks Sean, great post! Feel free to comment some more.