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Unread 06-27-2013, 06:36 AM   #1
JoshuaZ
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Pinion seal for u bolt yoke conversion

Does anybody know where I could source the pinion seal for a unbolt yoke conversion, the seal is different than the factory size and I would prefer not to spend $70 on a full kit just to get the seal. There was no numbers on the seal itself and when I called Quadratec they don't just sell the seal.

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Unread 06-27-2013, 08:17 AM   #2
biffgnar
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Recently changed my HP30 pinion seal and I have u-bolt yoke and the pinion seal was the same. Not sure I understand why it would be different. The pinion and housing sizes which are what are being sealed don't change. It is just the yoke to driveshaft connection that is different.
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Unread 06-27-2013, 08:47 AM   #3
JoshuaZ
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The ubolt yoke has a smaller diameter than the stock yoke so the original seal won't work. That's why I can't find them anywhere.
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Unread 06-27-2013, 08:48 AM   #4
JoshuaZ
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The outside diameter of the seal is stock size the inner rubber seal is the issue, it needs to be smaller.
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Unread 06-27-2013, 09:22 AM   #5
biffgnar
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I don't understand how the diameter of the yoke has anything to do with it. The seal fits between the housing and the pinion. The yoke just bolts to the pinion. Don't see how the pinion cares what kind of yoke is attached to it. Unless pinion is a different size (which would be odd) seems to me the seal is the same. I know it is on my HP30.
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Unread 06-27-2013, 09:26 AM   #6
Jerry Bransford
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Having done one u-bolt style yoke conversion on my previous TJ, I won't bother doing another.

First, the straps of the OE yoke are more than strong enough... they just don't break. Besides, it's not the straps that provide the strength, it's the yoke itself the u-joint sits in The straps just hold the u-joint down into the yoke that is the strength behind the design. Not to mention it's way too easy to overtighten the u-bolts & damage the bearing caps & needle bearings inside. Personally, I'm sticking with strap yokes even with my 1330 and 1350 size u-joints.
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Unread 06-27-2013, 09:31 AM   #7
JoshuaZ
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The inner part of the seal sits on the back of the yoke not the pinion. Ill post pics later it will be easier to explain
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Unread 06-27-2013, 11:28 AM   #8
rchase559
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Quote:
Originally Posted by biffgnar View Post
I don't understand how the diameter of the yoke has anything to do with it. The seal fits between the housing and the pinion. The yoke just bolts to the pinion. Don't see how the pinion cares what kind of yoke is attached to it. Unless pinion is a different size (which would be odd) seems to me the seal is the same. I know it is on my HP30.
Assuming we are talking about a D30, D35, or D44, the pinion seal is pressed into the housing (more of hammered in) and the rubber part rides on a machined surface on the yoke. It doesnt touch the pinion at all. This is why you will sometimes see a worn out yoke when replacing a pinion seal.

OP: I can't really give you any specific answers but knowing what axle are you dealing with may help others help you. Can you measure the OD of the yoke where the seal rides?
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Unread 06-27-2013, 11:39 AM   #9
Spyder05
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what axle are we talking about first off??

I know on my d44 I can slip over the pinion a d35 yoke from a tj or yj...both are d35 but they are different. but not all of those yokes will seal with my pinion seal. try a slightly different application.
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Unread 06-27-2013, 11:47 AM   #10
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Quote:
Originally Posted by rchase559 View Post
Assuming we are talking about a D30, D35, or D44, the pinion seal is pressed into the housing (more of hammered in) and the rubber part rides on a machined surface on the yoke. It doesnt touch the pinion at all. This is why you will sometimes see a worn out yoke when replacing a pinion seal.

OP: I can't really give you any specific answers but knowing what axle are you dealing with may help others help you. Can you measure the OD of the yoke where the seal rides?
OK, I get that now. Just looked at a spare D44 seal I had lying around (although I don't have a D44 axle anymore). The OD of the yoke though must be really small if he is saying its not going to seal.
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Unread 06-27-2013, 11:56 AM   #11
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Take it over to Motion Industries, not only can they match it up but they will have many options as far as material and design such as triple lip or ceramic slinger....Jon
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Unread 06-27-2013, 12:00 PM   #12
biffgnar
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Quote:
Originally Posted by Spyder05 View Post
what axle are we talking about first off??

I know on my d44 I can slip over the pinion a d35 yoke from a tj or yj...both are d35 but they are different. but not all of those yokes will seal with my pinion seal. try a slightly different application.
Interesting possibility. I just measured the inner hole in a D44 seal at approx. 40mm and the OD of an HP30 ubolt yoke at approx. 55m. Still seems like a decent amount of overlap if things got mixed up, but maybe not. I would have expected that comparison to be biggest seal to smallest yoke, but perhaps other combos are different.
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Unread 06-27-2013, 12:22 PM   #13
ftgiles
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Dana 30s and Dana 44s use the same yokes and the same seals. Just ask for a seal for an early model Jeep before they used strap yokes. '74 CJ-5 for example. That's what I tell the parts guy when I want the seal for my u-bolt yokes.
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Unread 06-27-2013, 01:02 PM   #14
JoshuaZ
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I just bought a new yoke kit, I don't have the time to look for the right seal. $80 is worth it to be able to drive the jeep while its nice out.
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Unread 06-27-2013, 02:13 PM   #15
Spyder05
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80$ for a seal...damn kid
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