Remeber to change both the pinion and ring gear when you have diff problems in that area. I am very surprised noone else is comming forward. I know they exist but noone is saying anything. The diff is junk. Ih ave shimmed till i cant shim any longer. you have to watch for the actual case deforming where the bearing on the pinion fits. it will start to wear and notch and you will spend alot of money replacing the chewed ring and pinion gears before you realize what is going on. The best shim setup I have found is 2 shims on the ring side and as many shims as you can get inbetween the pinion and bearing. mine are very tight and have found they will last 8-10 race weekends before they need replaced. The others lasted no more than 3-5 before they got chewed. HPI did not do the diff's very good. After 3 weeks of racing with my jammin the outdrive cups nor the diff gears have a single bur in them! And it doesnt fall apart in the race.
ORIGINAL: Dirby
can anybody tell me why the pinyon gear that drives the rear differental is getting chewed up?
it started making a clicking noise and the lhd discovered the berring on the rear diff had slid forward and i took the diff out put the berring back where it was supposed to be.
now it started making a screaming noise so i took the diff out and discovered the chewed up pinyon gear .
replaced the pinyon gear and chewed up the second one.
sure makes a heack of a racket.
any suggestions as to what is causeing this and how to make it go away?
thx Dirby