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Unread 08-15-2011, 02:27 PM   #1
foggybottombob
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Dana 44 gear pattern

This is my pattern on my third shot at pinion depth. Any opinions on this?
These are new 4.88 gears.
Drive side


Coast side


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Unread 08-15-2011, 04:29 PM   #2
bandhmo2
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Pinion is too deep, by quite a bit. Reduce pinion shims by 15 or 20 thousandths and try again.

In general it is better to make adjustments that are on the large size and to bracket the the correct value then to try to hit dead on, till the final adjustment.
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Unread 08-15-2011, 08:03 PM   #3
80cj
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Quote:
Originally Posted by bandhmo2 View Post
Pinion is too deep, by quite a bit. Reduce pinion shims by 15 or 20 thousandths and try again.

In general it is better to make adjustments that are on the large size and to bracket the the correct value then to try to hit dead on, till the final adjustment.
Yup. Too deep.
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Unread 08-16-2011, 07:34 AM   #4
foggybottombob
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The pattern started out way too shallow so I have definitely bracketed the optimum if this is too deep.

Since this looks centered face to flank to me, what is it about this pattern that indicates it being too deep?
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Unread 08-16-2011, 10:33 AM   #5
CSP
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For my untrained eye, your contact pattern on the drive side is concentrated too much to the toe side of the gear. The pattern it's making looks like backlash is good, but it needs to be centered more between the toe and heel.

Take that with a grain of salt as my r&p experience isn't as fine tuned as many here.
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Unread 08-16-2011, 10:36 AM   #6
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It isn't centered face/flank wise. The pattern is concentrated more in the bottom (root) of the ring gear teeth. Removing pinion shim will broaden the pattern and increase the bearing toward the face. Positioning the pattern heel/toe wise can be done after the pinon depth is correct by adjusting backlash.
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Unread 08-16-2011, 11:11 AM   #7
foggybottombob
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I can see that the teeth are bearing together harder (paint is rubbed off more) at the flank/root side. So is that the indication you are talking about?

I just want to get better at reading patterns.
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Unread 08-16-2011, 11:32 AM   #8
80cj
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Quote:
Originally Posted by foggybottombob View Post
I can see that the teeth are bearing together harder (paint is rubbed off more) at the flank/root side. So is that the indication you are talking about?

I just want to get better at reading patterns.
Yes. You're basically in the same situation that BioTex was in when he did his 44 although not to such a great extent.
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Unread 08-16-2011, 11:58 AM   #9
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Remember that since the pinion gear is cone shaped, the further into the ring gear it is positioned, the mesh will tend to be toward the bottom or root of the ring gear.
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Unread 08-16-2011, 01:03 PM   #10
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So is this more like what I want to see? In this pattern the bearing surface is more evenly distributed face to flank.
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Unread 08-16-2011, 01:21 PM   #11
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That's too concentrated in the root. I have some samples here of a some I've done.

This is a Ford 8.8. Note that the pattern covers most of the tooth face flank wise.



This one is Yukon gears in a Dana 35.




This is the AMC 20 on my CJ-5 with the pattern pretty much centered face flank wise with good coverage. The heel/toe position was the best I could get while staying with in the backlash spec. The important thing is that the pinion position is correct and Randy's Ring and Pinion stresses on this also. The second and third pics show the same gears after 500 miles. You can see that the pattern is nicely distributed over the gear teeth. they run nice and quiet.




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Unread 08-16-2011, 03:06 PM   #12
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The pattern on my 14-bolt, which I felt could have used a bit more shim on the pinion. They do run quiet and I figured it was a trail only vehicle, so I left it.
drive.jpg   coast.jpg  
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Unread 08-16-2011, 03:21 PM   #13
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Quote:
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The pattern on my 14-bolt, which I felt could have used a bit more shim on the pinion. They do run quiet and I figured it was a trail only vehicle, so I left it.
Looks pretty good actually. Just a trifle deep but very close. As I remember a 14 bolt has a pinion carrier so more shim would move the pinion outward which is like less shim on a D44.
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Unread 08-16-2011, 03:31 PM   #14
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Correct, the shim is between the pinion carrier and the main housing. More shim moves it outward.

That was my first shot too! Sometimes it's better to be lucky than good.
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Unread 08-16-2011, 08:05 PM   #15
foggybottombob
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Are you still there Bob? I think this is too shallow now. What do you think?
I took out 0.015" pinion depth shims.

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