-
I'm in the process of installing new Motive 4.30 R&P in my '01 Sierra 1500 with the 8.6 rear end. I used the same thickness pinion shim as was on the factory pinion. I bought a pinion depth checking tool from Ratech, but's kind of difficult to get a good reading.
I installed the new Detroit TrueTrac using the factory shims. Amazingly, I've got good bearing preload with a backlash of .007". Here's the resulting pattern. I marked three teeth in two different locations. Take a look and let me know how it looks to those of you that have some experience with this. This is the second truck I've setup. But the other one was quite a few years ago. I've got the ability, but not the experience. Once again, please take a look and let me know ASAP. I'm waiting on your response to button this thing up:D Thanks.
1st drive pattern
http://tweaker.smugmug.com/photos/136649149-L.jpg
1st coast pattern
http://tweaker.smugmug.com/photos/136649131-L.jpg
2nd drive pattern
http://tweaker.smugmug.com/photos/136649150-L.jpg
2nd coast pattern
http://tweaker.smugmug.com/photos/136649138-L.jpg
-
Looks like the pinion needs to be a little deeper. You need the contact pattern evenly located from the crest to the root of the tooth. Again, that is only by appearance in the pictures I see.
-
My pattern looked almost exactly as yours and my setup is working flawlessly not a trace of noise even while coasting. As red said it looks a little shallow but so did mine.
Good luck
-
Thanks for looking guys. I buttoned it up and took it for a spin. No whine at all! I'm very happy. Here's a look at my Detroit TrueTrac.
http://tweaker.smugmug.com/photos/136725153-L.jpg
http://tweaker.smugmug.com/photos/136725161-L.jpg
http://tweaker.smugmug.com/photos/136725141-L.jpg
