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Unread 12-02-2008, 07:16 PM   #1
bddisi
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Dana 30 Problem????

My Dana 30 has a slight bit of slop. You can grab the yoke and move it in and out, about 1/8 of an inch or so. Some one told me you could remove the yoke and pull out the seal, then fish out the shims or washers. Leave out the thinnest one and replace seal and reset bearing preload. Any ideas. Yes? No? Some thing easier? Anything, besides total tear down?

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Unread 12-03-2008, 05:54 PM   #2
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Unread 12-03-2008, 07:14 PM   #3
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I'm watching this thread to see what answers you get, I don't know the answer. I tend to doubt your suggestion is a good long term fix.
My experience is that any time you have a pinion with that much play (3 times in my career), you have a bigger problem. I would think you have at minimum a bad bearing. If your pinion is moving in and out 1/8" you may also have damage or at least a strange wear pattern on your gears.
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Unread 12-03-2008, 07:25 PM   #4
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I'm watching this thread to see what answers you get, I don't know the answer. I tend to doubt your suggestion is a good long term fix.
My experience is that any time you have a pinion with that much play (3 times in my career), you have a bigger problem. I would think you have at minimum a bad bearing. If your pinion is moving in and out 1/8" you may also have damage or at least a strange wear pattern on your gears.
Well thanks for that much. I have been watching this to for any suggestions. Tommorrow night I am going to pull the diff cover and check it out. I do remember flexing the driver side down and hitting the d-shaft on the t-case skid plate. I have a diffrent one now, and a new d-shaft too. I wonder if hitting the d-shaft could have hurt the bearing or stressed the set up enough for it to effect the bearing preload?
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Unread 12-03-2008, 07:41 PM   #5
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im not sure but i think they use a crush sleeve to preload the baearings in D30's if you hit it hard enough or torqued the pinion nut down to tight it would give you that of slop over time. factory gears?
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Unread 12-03-2008, 07:50 PM   #6
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456 gears detriot trutrac
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Unread 12-03-2008, 07:57 PM   #7
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how long has it all been installed and running? have you popped the cover to look at the wear pattern?

could have been the person installing it, doing it wrong
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Unread 12-03-2008, 08:07 PM   #8
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about 1 & 1/2yr. I am going to check it out tommorrow. Also I was looking at it earlier and you really cant move it in and out. It moves up and down about almost 1/8 in.
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Unread 12-03-2008, 08:44 PM   #9
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about 1 & 1/2yr. I am going to check it out tommorrow. Also I was looking at it earlier and you really cant move it in and out. It moves up and down about almost 1/8 in.
Try tightening the pinion yoke nut before you do anything else.
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Unread 12-03-2008, 09:01 PM   #10
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yeah, but dont over tighten the nut, use a pipe wrench to hold the yoke in place. if it did work loose, it might have been that the guy used the old nut, they should be replaced when they are removed. they are a crimp style
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Unread 12-03-2008, 09:02 PM   #11
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up and down would mean slop in the gear set, likely will have to replace the gears and have it all resetup by someone that knows what they are doing.
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Unread 12-03-2008, 09:08 PM   #12
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up and down would mean slop in the gear set, likely will have to replace the gears and have it all resetup by someone that knows what they are doing.
They are a pair of opposing tapered roller bearings. If the pinion nut is loose, it will move up and down because the cups are loose in the cones. (bearing and race for those that are unfamiliar)
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Unread 12-03-2008, 09:41 PM   #13
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Originally Posted by mrblaine View Post
They are a pair of opposing tapered roller bearings. If the pinion nut is loose, it will move up and down because the cups are loose in the cones. (bearing and race for those that are unfamiliar)
x2 The man knows his stuff.
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Unread 12-03-2008, 10:35 PM   #14
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Sounds about right to me. I will check it tonight, and post what I come up with. Thanks to all.
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Unread 12-03-2008, 11:16 PM   #15
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i will agree with mrblaine, but that would also mean the tapered roller bearings moved on the pinion shaft, and if he didnt catch it the instant it happened it has likely wore the gears wrong now.
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