gear pattern check please
 

Trying to set up my 9" third member, got the backlash set right at .009". Here are my drive and coast patterns.

Drive

http://i30.photobucket.com/albums/c3...5/000_0009.jpg

http://i30.photobucket.com/albums/c3...5/000_0010.jpg


http://i30.photobucket.com/albums/c3...5/000_0011.jpg


Coast

http://i30.photobucket.com/albums/c3...5/000_0012.jpg

http://i30.photobucket.com/albums/c3...5/000_0013.jpg

http://i30.photobucket.com/albums/c3...5/000_0014.jpg


thanks,
pete

the coast seems to look good, does anyone think the drive looks a little too close to the edge of the tooth??

you mean like it could move to the right in the first pic (sorry forgot the terminology)?
Would that mean I need to add shims on the pinion support to housing interface. Thanks for the response

basically move the ring gear in closer to the pinion to get the pattern a little deeper on the ring gear tooth, it seems to be pretty close to the edge. i may be wrong though as im still learning wipe patterns.

ah I see what you're saying, I really need to call motive and find out what their recommended backlash setting is.

it will say in the gears. But motive is between .007-.009 Ide set the backlash abit tighter if it was me.

Yeah if I ran closer to .007 maybe that would help my pattern a little...

i was looking again and there does seem to be a line on the drive side where its not going to the edge of the tooth, just like the coast, except the coast is more defined. maybe you didnt load it as good on the drive side. set your backlash within spec and gives us some fresh pics...

be nice if one of the sponsors chimed in. expert advice is always appreciated.

Yeah my plan is to tighten up the backlash a little more and then put some new compound on the gears and see what the pattern looks like. I'm pretty sure I need to add just a touch thicker shim between the pinion support and housing. I just want to get this thing together. Appreciate the responses so far.

.009" backlash should be good for a 9". Use a thnner shim between case and pinnion support and see what she looks like.

Mike

i've got the thinnest shim in there .010". Have you ever heard about having no shims in it?

I came across that in a thread I was reading a couple months ago. It's unusual, but not unheard of. Try it with no shim and see how it looks.

Are you applying any preload to the side adjusters when setting the backlash?

Mike

Looks to me the Pinion depth needs to be changed.

mikey,

I have the preloaders pretty tight when i'm checking the backlash but i'm not apply any load to the actualy preloaders themselves with like a clamp or bar or something. Also when doing the gear pattern check do you spin the pinion both ways?

Those patterns are a bit unclear. Put a little oil on the ring gear teeth and make sure you have carrier preload, rotate the ring gear back and forth 3 or 4 times then take more pics so we have a better picture of the contact pattern.

Jeff

New Pics:

Drive:

http://i30.photobucket.com/albums/c3...5/000_0016.jpg


http://i30.photobucket.com/albums/c3...5/000_0017.jpg


Coast:

http://i30.photobucket.com/albums/c3...5/000_0018.jpg

http://i30.photobucket.com/albums/c3...5/000_0019.jpg

I put at a minimum,,, 75lb/ft of torque on the side adjusters. This preloads the caps so they won't spread/move apart under a hard launch and f*(K up your settings.

Also, you should be applying resistance to the ring gear while spinning the pinion when doing your pattern check. Sometimes people forget that part lol...

I've never actually had a pattern turn out like yours before, with the drive side so far out on the heel, and the coast side so far into the toe.

Mike

Heel to Toe makes no difference if the pattern is centered from face to flank or top to bottom. If the housing was machined high or low you will get the heel/toe combo like shown above. Make sure your backlash is out to .010" and button it up.

Jeff

Not perfect (but maybe not your fault), but it falls within what is considered acceptable. Run em.