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Advice on contact pattern

S

squint_91

NAXJA Forum User
Location
seattle
I'm right in the middle of setting up my Dana 44, 4.56, ARB combo. I could use some advice on contact pattern before I go any further. This is my 2nd attempt at setting the inner pinion shims (increased from 0.042 to 0.045"), and 4th attempt setting backlash (currently 0.008-0.009").

Drive side
J4p7uYT.jpg


Coast side
azH6Q8R.jpg


Is the pinion too deep here? This is the difficult subjective part of the process where I have no experience.
 
I would say yes, Half moon shape with straight line on the root (bottom), means too deep so you need add pinion depth shims. I'd guess .004-.006 would get you there/almost there.
 
md21722 said:
These guys are absolutely correct I stated shim change backwards.
Click to expand...

Hah, that's what I figured you meant. Thanks for the advice! I can see it pretty clearly now after looking at the pictures for a while. The pattern at 0.042 was also too deep, I think I will remove 0.006" and check again.
 
I've seen a couple people mention that running a little deep is ok, which is a little surprising to me. But I get the rational - the case deflects under stress. I spent more time shimming and I think I got it pretty dialed in. This is really not as hard as some people make it out to be (with the proper tools anyway)

B/L sits at 0.007-0.008

ncfxXYw.jpg
 
That looks really nice. Good job!
 
Just wondering--did you have to pound out/pound back in the inner pinion bearing race each time you adjusted? I used a setup race recently but the results didn't match the final result when I swapped in the actual press-fit race.
 
Thanks! Very satisfying to get results after poring over threads and pictures, building the damn case spreader, and buying all the tools.

I used a set up race for the inner pinion bearing that I could remove by hand. I haven't taken a final pattern yet, but my backlash tightened up by 0.002 after installing the new race so I need to get that back in spec first.
 
I've been running this axle for a few months and put almost 2,000 miles on it. I followed the break in procedure and changed the gear oil twice. Both times, the magnetic drain plug has looked like this:
R4q0R5a.jpg


Is this pretty normal? The stuff stuck to the drain plug has an extremely fine texture, like mud. I wonder if you would notice this dispersed in the oil if you didn't have a magnet in there. Here are a few more pictures with the diff cover off:
IejtPdC.jpg


F26cj46.jpg


zkjQRZB.jpg
 
Did you have any bearing failures or metal in there before? That stuff can be extremely hard to get out. I'd say some is normal, but if the oil starts getting glittery too you may have a problem.
 
trippled said:
Did you have any bearing failures or metal in there before? That stuff can be extremely hard to get out. I'd say some is normal, but if the oil starts getting glittery too you may have a problem.
Click to expand...

I totally cleaned out the housing, but it's possible there was some lingering stuff in there. I'm just going to keep running it, it's super smooth and no noise at all soooo I guess it must be normal.
 
Alright it's time for the front D30/ARB. Any input on this pattern? Specs are IP 0.054", RGS 0.020", NRGS 0.062", 0.007-0.008" backlash, and roughly 0.005" carrier preload per side.

uc


uc
 
DSCN0242_zpsrh8srglm.jpg
A compare contrast photo. Has some gear whine and pinion pre-load is tight, although I'm going to run it 500mi. and re-do it. It is the 8.25" rear with 4 56: gear set, wanted to show.:)
 
Last edited:
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