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D44 R&P pattern 2 Attachment(s)
Would love to get some opinions on this R&P pattern. It’s a Dana 44 Yukon 3.54 for an F1 rear end. Pinion preload at 12 in/lbs and backlash at 0.005.
JB |
Re: D44 R&P pattern I'd say it looks good. They never seem to look exactly like the books show. Your pattern feathers out toward the top of the tooth which in my opinion is good because under load the contact point will move up the tooth.
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Re: D44 R&P pattern 1 Attachment(s)
Thanks bud. I asked the tech guy at Randy’s ring and pinion this morning and he said that the hard flat line at the root of the tooth indicated that the pinion was too deep. I am thinking what I have is E in this pic, and need to remove shims from under the rear pinion race to move it away from the ring. But wonder if we are close enough. I want to set it as close as we can while it’s on the bench.
JB |
Re: D44 R&P pattern Backlash at .005 seems a bit tight.
Lawrie |
Re: D44 R&P pattern I'd say it will run and be quiet...but if it were mine I'd try to get the backlash at .008-.009 by moving the pinion a touch and see if it moves that bottom line up and softens it some. Have to watch the pattern location heel/toe as well when moving the pinion instead of the ring gear case.
Terry |
Re: D44 R&P pattern Roger that, I am going to drop the pinion 0.010, set that backlash you suggest, and report back. Thx
JB |
Re: D44 R&P pattern I've been retired for 6 years so it's been awhile since I've done a Dana 44 but as I remember backlash is .004-.008" and preload for new pinion bearings is about 20-30 in. lbs. so you could take out a .003" shim from the rear pinion race and a .005" from the front pinion bearing and see where you're at....Or does this rear end use a crush sleeve? If so, you need to make sure the pinion nut torque is at spec. (somewhere around 180-200 ft. lbs.) when the specified preload is reached. Usually it takes a new crush sleeve when setting the final preload.
I think the pattern you have now is OK, but it never hurts to try improving it! |
Re: D44 R&P pattern It's a bit deep in the root but its not bottomed out. A person can look at the old gears and see where the root line starts on them. It's impossible to fully load a pinion for the contact pattern check so they are never spread out on the tooth as well as they actually run in service.
You may already have this link but it's a good representation. http://departments.weber.edu/automot...rpretation.pdf |
Re: D44 R&P pattern Quote:
https://www.fordbarn.com/forum/attac...7&d=1596480654 |
Re: D44 R&P pattern 2 Attachment(s)
Really good feedback guys, thank you. It’s an early 44 so no crush sleeve. It’s a tedious task of correct shims and torque tests. We made setup bearings but they do not compress the carrier shims well. So every change we make, we have to pull the carrier bearings with a clamshell puller. Dad and I must have reset this thing thirty times no joke. A pic of all our tools we have out! We have all the right tools fortunately.
It’s going in our 52 “Dallas” build. I have all the original hardware plated and ready to button it up after we get the pattern just right. JB |
Re: D44 R&P pattern Quote:
https://www.fordbarn.com/forum/attac...6&d=1596499846 |
Re: D44 R&P pattern The Lincoln Mercury O/H Manual shows the tools that they used to measure the pinion depth. The OEM R&P sets had the numbers scribed on to use with the calibration chart for set up. This made it a lot easier to set them up correctly with minimal adjustmants. Unfortunately, most of this stuff and the Manzel 4020B tooling is near unobtainium now so a person has to do it the by guess or by golly method of trial and error.
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Re: D44 R&P pattern Back in the days when I was building 44's for Jeeps, I made my own tools to set pinion depth. Not hard to do. And, BTW, setting pinion depth is not 'fool-proof'. The pattern rules, and sometimes a small adjustment is needed on pinion depth. (Not often)
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Re: D44 R&P pattern Quote:
JB |
Re: D44 R&P pattern 1 Attachment(s)
One question I also have is the front and rear pinion bearing oil slingers. The original pinion did not have these, just the oil slinger between the front bearing and companion flange. Should I use them, I have them in the shim kit.
JB |
Re: D44 R&P pattern Quote:
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Re: D44 R&P pattern The original 8M-4670 slinger doesn't look like either of those. It had a hat shape to it. It was designed to work with the early type seal to minimize lubricant exposure. The old seals were usually leather so they didn't hold a very defined lip. It may work without if the new type seal has a lip but I wonder about the stack up dimension too. I would gravitate toward use of the original type myself. I see nothing about a rear oil slinger or baffle in the original parts breakdown. The only slinger shown is placed in front of the forward bearing and had a wick that fit into it that was likely made from felt like a felt washer. It also had a relatively large round gasket forward of that but it's small in cross section. The Dana 41 and 44 axles were set up with the same pinion related parts in those early 19-spline years. The Dana 41 just had a smaller carrier and case assembly but used a lot of the same parts.
The seals were changed in later years but then there were so many types of Dana 44 axle, it's hard to keep track of them all. I would have to do more research to find what all is still available and what different parts may be acceptable for use when parts aren't available. |
Re: D44 R&P pattern 2 Attachment(s)
See what you think of this pattern. Lowered the pinion 0.006 which opened up the backlash to 0.0075. Preload still sitting between 12-14 in/lbs.
JB |
Re: D44 R&P pattern I like that,and would run it if it were mine. Still a bit of a "hard" line at the lower edge,but hey...some gear sets are just that way and are perfectly fine. You've done a good job checking and adjusting!
Terry |
Re: D44 R&P pattern Quote:
https://www.fordbarn.com/forum/attac...5&d=1596849651 |
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