Binding diffs after swapping Infraction and Limitless

[dure16]

I wanted faster gearing for my Limitless V1, so I swapped diffs and input gears with my Infraction V2.

The new gears in the Infraction are smooth as butter.

But the new gears in the Limitless bind. The crown gear and the input gear mesh smoothly for about 75% of a turn, but that last 25% binds pretty good. Same for both front and rear bulkheads. Shimming didn't seem to help. I can't see anything wrong. All gears were smooth in both cars before I started the swap.

Any ideas?

 

[Garcbomber]

Shim the right side instead of the left, make sure bearings are fully seated into the bulkhead and no debris is behind. The large bearing will egg out the composite on a well used bulkhead, especially with speed running that creates excessive heat. If the input has play you’ll see it right away, just had my last composite bulkhead go bad due to that. Usually it’ll create a tooth slip however and not a bind

 

[gotnitro]

To add, on the side of that last 25%, tighten the diff cup, see if that might be enough.

 

[dure16]

Shim the right side instead of the left, make sure bearings are fully seated into the bulkhead and no debris is behind. The large bearing will egg out the composite on a well used bulkhead, especially with speed running that creates excessive heat. If the input has play you’ll see it right away, just had my last composite bulkhead go bad due to that. Usually it’ll create a tooth slip however and not a bind

Wouldn’t shimming the right side push the gears closer together? I’d think that would make it bind worse. Great advice on the bulkhead. Thanks.

To add, on the side of that last 25%, tighten the diff cup, see if that might be enough.

Good idea, thanks.

 

[Garcbomber]

Wouldn’t shimming the right side push the gears closer together? I’d think that would make it bind worse. Great advice on the bulkhead. Thanks.

Good idea, thanks.

On 6S arrma looking into the bulkhead the ring gear will be on the left side, any shims placed left of the bearing race will push the teeth closer to the input. If you have too much mesh I’d be removing any shim behind the input first, then shim the right diff case bearing next(uncommon). Something it out of concentricity if you’re getting oval or oblong mesh.

 

[dure16]

On 6S arrma looking into the bulkhead the ring gear will be on the left side, any shims placed left of the bearing race will push the teeth closer to the input. If you have too much mesh I’d be removing any shim behind the input first, then shim the right diff case bearing next(uncommon). Something it out of concentricity if you’re getting oval or oblong mesh.

View attachment 326383

Ah okay, we're speaking the same language. The crown is just on the opposite side in the on-road cars. Thanks.