US-Gear 12-bolt pro gear issues ???

[Kevin Panzino]

Thanks for the replies gents. I have tried .008 backlash and also tried .010?. To me the .008 sounds worse.
I am at .032? pinion shim and are spot on the 2.854? checking distance.
I?m really thinking I got a bad set.

Kp

[Adger Smith]

Kevin, I know this is Elementary, but you do know the caps and housing are not split on center? A pinion shim that thick could be putting the pinion deep. I would have thought around a .026 was thick enough. How much pinion shim was in it to begin with??? I agree the gear could be mismanfactured.

[Kevin Panzino]

Wait. What? I am I guess ashamed to say I never guessed the cap/housing split line wasn?t on center. It can?t be much, right? As you wouldn?t be able to get the races in or the caps on? I suppose the ends are relieved?

Yes I have been measuring checking distance for years from the cap face!!

I had .032? also in my old Richmond set. While it was always a tad loud on coastdown, it wasn?t this loud.

Now you really have me thinking.

One thing I can?t reconcile though is how I was able to get a good drive pattern, but terrible coast pattern?..

Old Richmond set had prob 500 passes fwiw. And teeth looked great.


Kp

[Mark Ugrich]

Originally Posted by Adger Smith

Kevin, I know this is Elementary, but you do know the caps and housing are not split on center? A pinion shim that thick could be putting the pinion deep. I would have thought around a .026 was thick enough. How much pinion shim was in it to begin with??? I agree the gear could be mismanfactured.

Adger, I remember from my days as a heavy line tech at Buick using the kent moore tools to set pinion depth.The service manual said it was a ? nominal? measurement. Which I understood to mean, it is , but it isn?t , but it could be ,what you just measured.The caps not split on center might be the reason for a nominal measurement.