i guess there is a difference between having a warranty, and having a product that just wont break...

i have a quaife, when it was getting installed, the mechanic said i was going to hate it. then he drove it and couldnt hear it, then i drove it and didnt even notice there was a change in the diff during normal driving. but under power it now spins 2 wheels predictibly, so he was certainly surprised compared to other noisy mechanical diffs he had used.

when i was buying my diff, the shop i was getting it off suggested the wave trac diff, which is the same as a quaife but has wave shaped washers that preload the diff, which as someone earlier suggested was the quaifes down fall, putting power to the other wheel when one is in the air. apparantly the wave trac cures that. but i wanted to go for something tried and true, and proven, so i went for the quaife, even though they were the same price.

i also like the idea of it not wearing out, and being known as the best. so im not worried in the slightest of it breaking.

that being said i have no experience of any other type of diff on the market.