Thread: New pinion and ring installation

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My brain is making fish sounds!!!
Soo just to make sure..... The toe is the inner part of the ring,I am currently too far on the heel.In order to make the pattern move to the inner part of the ring,the pinion needs to travel closer to the back of the truck{more pinion shim}?
Thnx for the pics Denny,the ones from Richmond were lacking to say the least I now have a good reference of which side of the ring teeth are drive and coast ,what the correct gear mitre should look like,and how to achieve this.
Now I just need to remove and re-install Then start the checks over

PATTERN MOVEMENTS SUMMARIZED
...Pinion shims usually must be moved in .003 of an inch increments to notice a pattern change. If a pattern is heavy toe subtract shims. If a pattern is heavy heel add shims.
(1) Decreasing backlash moves the ring gear closer to the pinion.

Drive pattern (convex side of gear) moves slightly lower and toward the toe.

Coast pattern (concave side of gear) moves lower and toward the toe

A little less backlash and a thicker pinion shim and I am on my way to checkin it all over again !!!THnx for the new pics and diagrams,its clear now.
You may not be here physically,but belive me your here helpin!!!!

Well....I have come to the realization that reading the mitre marks on the gears are a little more complex than I first imagined,I want to apologize for not getting 5 dollars worth of marking compound and posting these less than stellar mitre pics.
I am off to get the pinion shims and some of the correct gear marking compound.I will wash it all down with brake clean and use the marking compound to get some readable markings,so that no one has to get thicker glasses

Here we go...I see why the marking compound is recomended.
I still think you are right on on what needs to be done,Denny.I just wanted to use the correct compound so that it was at least easy to read my pics,as your pay on this job is not the best
Heres the first 4 ,3 more to follow.

3 more......

The backlash is at .008 the ring has .010 and the directions say do not vary from the stamped ring .010 more than .004 and it also mentions not run this too tightly. A larger lash than the stamped .010 is always desirable opposed to smaller reading,this is what the directions say .

Ding DIng Ding ...I think were close to a winner....

1 more......The backlash is at .011 to .012 now
The pattern is almost identical to the chart that came with the gears now But I still will go off of your final say Denny...

Shawn....leave it there....I noticed "coast" side pattern on the last pic. You have good patterns for doing this and not knowing how hard or soft your material is, I'd leave it. If backlash specs are correct, you won't have noise and you won't chew up these gears where they are now.

Thnx,I definatly feel better now!!!!
Time to take it apart and put it back together for the last time!!!!!
I would have given up long before this if not for the great help I have recieved from you Denny.You did not even give me a hard time about the chalk marks Thanks once again for helping me make it that much closer to the road..!!!!!!!!

Well murphy struck ,...the new pinion bearing and the old are 15 thousandths different Soo back to pressing /shimming/and marking compound I got it down now ,its just a matter of doing it now!!

Know what?????.....if I ever find that Murphy guy, we're gonna have some fun. He's bit me in the rear quarters more than I care to mention.

Well I used the image of the metal murphy to run the other murphy off and this is what I have now.......I think it may need a few thousandths more on the pinion shim,the back lash is .014 now.The added pinion shim should also close the lash up a little more.?

more pics....

It was at .029 thick,its now at .035 thick{the current pics},I just moved it to .037 and have some new pics....it still looks like it could stand .003 more...
I will post the new pics at .037 here in a sec.The backlash is at .013 now.