I'm not a gear expert but from what I've seen that pattern looks fine. Make sure you use a diff case spreader so you don't destroy the carrier shims - carrier preload is also important.

 

Thank you! I used fsm for pinion rotating torque then added shims to carrier to get total rotating torque within specs.

I’ve never seen a master install kit without pinion shims. The rear d44 kit has it. Just was wondering if it’s the norm now.

 

Did it have a crush sleeve?

 

Yes the kit came with a crush sleeve but I didn’t use it. I usually use the solid spacer with shims.

 

Well that’s a crock!!! You would have to know absolutely what your pinion shim requirements are to put shims behind the bearing race. Once shims are pressed In Behind the race you will destroy them if they are not correct and have to come back off. That’s why we use a set up bearing on the pinion to get the correct pinion shims in the proper place before pressing the final bearing on.
However, most times using the factory shim behind the new pinion will put you in a good place.


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Exactly! I would destroy the oil baffle that goes behind that outer race. Fortunately the original .045” shim produced that pattern.

 

First off you are right to question the lack of pinion shims. They should be There. Though you can shim the race it wasn’t the answer the manufacturer should have given you.

More times than not measuring the stock pinion shim and using that as a starting point gets you within .005 of where you need to be and it looks like it this time too. If I was to be picky you look a like you could use .005 under the pinion. The pattern looks like it is flat at the flank but it is tough to tell. If you thin out the pattern paint with a drop of gear oil it will show the contact pattern a little better. You are looking for more of a football pattern on the tooth. Or... it could be fine. Tough to tell with the pic.

The person who says you don’t use pinion shims with a crush sleeve is confusing the pinion shims for a pack of crush sleeve eliminators I think. You definitely need pinion shims!

My method for setting pinion preload is to spread the case .010 / .012 and get every bit of shim I can get in. I always end up in spec.

This is a pattern from a set of axles I did last week. You can see the football pattern.

 

Thank you. I found another issue. This is for rear dana 44 install kit. The ring gear bolts only go in about 3.5 turns. Way too short in my opinion. The ring gear is threaded much deeper and would accommodate much longer bolt.

I think I gotta purchase longer bolts, maybe even use the larger 1/2 x 20 holes.
Revolution gears came recommended too and I paid extra for their timken kit.

Untitled by Ray zor, on Flickr

Untitled by Ray zor, on Flickr

Untitled by Ray zor, on Flickr

 

Got everything installed. Have about 100 miles on it. Temps with infrared thermal gun max out at 170f. However the rear axle has a thump noise at low speeds. Coasting from 25mph down to a compete stop. One thump per wheel revolution. While accelerating under load there is no noise. Decel in gear slight noise. In neutral is the loudest while rolling to a stop. No noise on jack stands.

I connected my mechanics chassis ear and loudest is from wheel bearing area. Just a thump thump thump proportional to road speed.

Any ideas? Was gonna wait till 500 mile axle oil change but probably won’t now.

Appreciate any input!

 

id pull the cover and look at it just to alleviate any stress. No idea otherwise.

FWIW, I don't think there should be any gear noise. I would double check your backlash at a minimum. Might clean it all back up and run another pattern as well

 

Should be no noise whether accelerating or decelerating. If you hear noise at the rear bearing pull it apart, something going on in there.


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Alright thanks all. Yes it’s weird. Noise is loudest when coasting (neutral or step clutch in) None when accel. Only at low speeds. 25mph and below. Thump is timed to wheel speed. I’ll pull cover off this weekend. Maybe it’s the truetrac? I set backlash to .006” on front and rear but rear has a lot more lash now when spin driveshaft with tires on the ground. Im guessing it’s play in truetrac.

 

Shouldn’t be play like that in the TruTrac.


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Pulled cover this afternoon. Oil came out almost like new. Backlash is at .006”-.007”. Gears look great.

I can make noise come out on stands. Accelerate to around 20mph then press in clutch or throw in neutral.( Coasting with no load is when noise occurs, no noise when loaded accel or decel)

I did find where all the play is coming from, not r&p backlash but internal to truetrac. In this vid I have parking brakes in(axles held stationary) and you can see travel of carrier/ring gear when I rotate pinion.

Is it normal for a truetrac to have this amount of internal play? My front does not but it’s a Dana 30.

200miles on it so far.

Thanks

 

That doesn't sound right.

 

Update. The noise is almost completely gone! After inspecting r&p and verifying it wasnt a bearing. I suspected truetrac. Searched online and found several similar.
Untitled by Ray zor, on Flickr

Untitled by Ray zor, on Flickr

Untitled by Ray zor, on Flickr

So after filling with fresh oil I decided to just drive it more. Finally took on freeway and noticed noise getting softer. More miles and even better. Around 260 miles almost gone.

Regarding backlash within truetrac, found this in install manual.
Untitled by Ray zor, on Flickr

Thanks all! Now can move on to other mods!