LS1-IROC

iTrader: (4)

Is this pitting on the tooth face normal? I just bought a used 9inch rear with only 500 miles on it...I pulled it apart and found this. It's a US gearset and currently has .010 backlash in it.

kenSS

iTrader: (1)

i never seen it before.

shtnfrds

iTrader: (1)

IVE NEVER SEEN IT BEFORE AS WELL, but i imagine surface irregularities like that cant be good on such a high stress part.

Zmg00camaross

iTrader: (11)

All most like gears got wet and rusted a little and then where used and again, and pitted the gears. Thats a guess but either way i wouldnt use them probly make noise. and gears a cheap enuff.

cambirdracing

iTrader: (4)

It will also create stress risers and probably bust a few teeth off of it.

Looks like it has been out in the weather for aa while.

LS1-IROC

iTrader: (4)

The rust idea makes some sense, but the wierd thing is that the pitting is only on the coast side of the tooth...The drive side looks fine. I just wonder if the guy I bought this from had a used ring and pinion set installed when he had the rear built.

LS1-IROC

iTrader: (4)

I tore the diff all apart and confirmed the pitting was from rust on the tooth surface. I looked at the pits under 10X optical zoom and you can clearly see the rust. Also found rust pitting on the pinion support bearing races.

So guess I'll be buying a new gearset.

RsSean

iTrader: (27)

Looks to me that the metal is pitting, maybe to lack of fluid. See that a lot in the axle shaft where the outter bearing rides when there is a lack of lube.

supermouse4

From the looks, there is rust on the gears. Change the gears to ensure that you don't have gear failure from the pitting and stress risers.