ring and pinion stripping

[phildogg]

Hey running a raze st and the stock ring and pinion are stripping,alot of clicking when braking and occasionally under hard acceleration. the rear is rough to the feel.tried to shim it but I think the damage is already done. I was wondering if another ring and pinion out of something like a hyper 7 would work or just go back with stock ring and pinion.lmk
phil

[RCParts411]

I had the exact same issue and symptoms with my Kyosho St-RR at the track last Sunday. I did however have to replace the gears. Even the second set of gears started to grind a little. When I took it apart I noticed 1 of my shims was not seated correctly.

From what I was told shimming is key. My front diff has 2 shims on each side. I moved 1 shim over to create a tighter mesh with the ring/pinion. I've only tested on the street after adjusting the shims but the sound disappears even under the heaviest of braking.

You'll probably just want to go ahead and replace you ring & pinion. Once its stripped out a little theres nothing you can do.

[mothman]

Originally Posted by RCParts411

I had the exact same issue and symptoms with my Kyosho St-RR at the track last Sunday. I did however have to replace the gears. Even the second set of gears started to grind a little. When I took it apart I noticed 1 of my shims was not seated correctly.

From what I was told shimming is key. My front diff has 2 shims on each side. I moved 1 shim over to create a tighter mesh with the ring/pinion. I've only tested on the street after adjusting the shims but the sound disappears even under the heaviest of braking.

You'll probably just want to go ahead and replace you ring & pinion. Once its stripped out a little theres nothing you can do.

Wow, I always thought that the ring and pinion for st-rr is the strongest among the buggy diffs since it is made of chrome moly steel. From what I have read, this steel is extremely hard.

[George16]

So far, I don't have any problems with my ST RR diffs. However, I shimmed them differently. I don't use the shims that came with them but rather use 8x10 with varying thickness and placed the shims between the cups and bearings compared to the stock setup wherein the shims go between the bulkhead and bearings. This way, the shims don't move around.

[lincpimp]

I always felt that shimming between the diff and the bearing was a better idea than shimming between the bearing and the case. It does require you to gut the diff internals, as the outdrives usually prevent you from removing the bearings. But if you want it done right...

[George16]

Originally Posted by lincpimp

I always felt that shimming between the diff and the bearing was a better idea than shimming between the bearing and the case. It does require you to gut the diff internals, as the outdrives usually prevent you from removing the bearings. But if you want it done right...

That's true . I actually use the UE diff shimming instructions in shimming my diffs. So far, I still have to strip any of my diffs on the Gmaxx, ST RR, and Revo conversion (of course my nitro trucks too).