How Does My 9" Rearend Rebuild Look?

[wickedmach1]

I just rebuilt my 9" rearend for my '70 Mach1 using Motive Gear's performance 3.89 ring and pinion set and a Detroit True-Trac differential. Below are some pics of the teeth contact patch on the ring gear. Please let me know if this looks good. Motive Grear called for the backlash to be set between .008" and .012". I chose the middle and set the backlash at .010". I used shims to set the pinion dept to the required height. I also used a inch pound torque wrench to set the required pinion bearing pre-load. With all this said and the specs within tolerance, does the contact patch look to be good? Motive Gear shows the contact patch should be dead center of the ring gear tooth. Those guys who have done this before, please let me know what you think. This is my first rebuild, and this contact patch that you see was on my first try. Please let me if you would take the time to see more pics. I can email them to you. Any opinions? Thanks for your time.

 

[12sec67]

i see blurry teeth.....good i guess?

 

[wickedmach1]

Sorry, I am still figuring out my digital camera. It has too many buttons and settings.

 

[TurboDoctor]

I cant see it either, as long as you got your pinion depth corect and backlash set, getting the proper cotact patch is the easy part

 

[wickedmach1]

Does anyone have some pictures that they can send me of the correct contact patch? I would like to match it up with mine. If it is easier to email, that would be fine. Thanks for the help.

 

[jmlay71]

Take a peak at this. IMHO it looks like the pinion is too far to the outside of the ring...

Mike

Does anyone have some pictures that they can send me of the correct contact patch? I would like to match it up with mine. If it is easier to email, that would be fine. Thanks for the help.

 

[Sundance]

I agree with jmlay71 too far to the outside of the ring gear. You need to lessen the amount of shims it looks like. How did you set the pinion depth? Did you use a pinion depth gage?

 

[Sundance]

Tooth contact pattern pics:

http://www.richmondgear.com/01instructions.html

 

[Sundance]

To get a better contact pattern while turning the pinion put your palm on the ring gear as it turns. This places more pressure on the gears and makes a clearer pattern. Move the camera back a bit and get a pic of the load and coast sides. If you do all that we can help you better.

 

[jmlay71]

This is what I tried to post:

http://www.ford-trucks.com/articles/9inch/index.php

Guess I was out of glue...

Mike