8.8 regear: How's my pattern look?

[jake3240]

I decided to tackle my first gear install last week. Finally got to running some patterns on my gears yesterday. I think I have it close but wanted to get your opinions before I call it good. The thing that is concerning me is the line at the root of the tooth. From what I've seen and read, it seems like the pattern should be a bit more feathered and a little bigger. Any suggestions?

Here' what I used:
Precision Gear ford 8.8 4.88 ring/pinion
DT (timken) master install kit
Detroit Locker
(super 88 kit is on the way)


This is with pinion depth set to .040" & .009" Backlash

Coast

Drive

 

[Frank Z]

Pinion is too deep.

 

[jake3240]

Thanks. I'll try backing it out some.

 

[jake3240]

OK, so I spent most of today rolling patterns. Needless to say, I've gotten pretty good at pulling that carrier & pinion outta there. Thank god for setup bearings. I tried to do about 3 backlash runs for every change in pinion depth.
Here's a run I did at .030 Pinion shim & .015 Backlash. The drive side is a bit higher toward the top of the tooth, but the coast side is a little closer to toe. Am I on the right track?

Coast

Drive

Here's a link to the rest. I ran patterns from .038 down to .023 Pinion shim.

http://smg.photobucket.com/albums/v255/Jake3240/Gear patterns/

 

[Serious Offroad]

.025/.009 looks good. The deeper the pinion more defined the pattern cut-off (straight line) near the root is.

 

[Frank Z]

What he said!!

(I gotta remember to switch back to my regular screen name. Sorry about that...)

 

[jake3240]

Sweet. Thanks for the look. I can't wait to get these guys in. Now I just need to build up my front D44 so I can get rid of my broken D30 and actually have 4WD again. Really appreciate the help.

 

[Frank Z]

:cheers:

 

[Super mud]

Ok some learning time for me. What did you mean by the pinion was too deep? Say the contact was too close to the inside of the ring gear or it was too deep in the housing on the edge of the ring gear?
I'm doing my 8.8 soon and just relized I dont know as much as I thought. Also I'm throwing an arb in a d30 I'm rebuilding so I can learn on setting the carrier and checking the mesh before pulling out the rear.

 

[Frank Z]

To far into the housing.

 

[jake3240]

I'm doing my 8.8 soon and just relized I dont know as much as I thought

Haha, that was how I started feeling once I started rolling out patterns. It's certainly a learning experience. I'm glad I kept with it though. Best wishes on your build. PS, Be sure to document everything with pictures and keep them organized. Then you can compare one pattern to another after you take a break & de-stress. That helps a lot.

 

[Porch951]

This manual has a really great illustration of common patterns and what they mean:
http://pirate4x4.com/tech/billavista/PDFs/Yukon Gear Ring and Pinion installation instructions.pdf