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Old 11-13-2011, 09:44 AM   #1
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How is my pinion angle

Still workin last few kinks out from po. Wiggles at 50 moh through tranny and wheel but over 55 it's smooth just can hear or feel the ujoints a little vibrating. I am going to do a tranny mount to know that's tight but what can be bad w driveshaft angles. Ujoints are all new.

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Old 11-13-2011, 09:50 AM   #2
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The rear pinion angle is the critical one, an additional photo showing just the rear pinion angle where it connects to the driveshaft a little better directly from the side would help.

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Old 11-13-2011, 10:03 AM   #3
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Anything ya need let me know. Just wanna fix it!
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Old 11-13-2011, 10:05 AM   #4
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Well, it's real hard to know for sure from that angle but that pinion angle looks too low.
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Old 11-13-2011, 10:25 AM   #5
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Quote:
Originally Posted by Jerry Bransford
Well, it's real hard to know for sure from that angle but that pinion angle looks too low.
Yea it tuff to get up. When I get home I'll put on the lift an try better angle. If I could explain it it's deff lower than a straight line. Should I try turning upper control arms a turn longer? So I want angle to be flat?
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Old 11-13-2011, 10:28 AM   #6
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Any better?
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Old 11-13-2011, 10:30 AM   #7
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Yes, If the pinion is too low you'll want to lengthen the upper CAs to raise the pinion. If you have a way to measure it (angle finder) you'd want to set the pinion about 1 degree higher than the driveshaft to allow some room for torque.

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Old 11-13-2011, 10:36 AM   #8
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I hVe angle finder at home. So I want my pinion pointed up 1* over what my driveshaft angle is correct? I can do that today that would be awesome.

Just so I can get all lined up in my head, u want higher cause tourqe will wrap axle forward therefor pushing pinion down towards ground.
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Old 11-13-2011, 10:55 AM   #9
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Just so I can get all lined up in my head, u want higher cause tourqe will wrap axle forward therefor pushing pinion down towards ground.
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Old 11-13-2011, 11:00 AM   #10
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If you have a way to measure it (angle finder) you'd want to set the pinion about 1 degree higher than the driveshaft to allow some room for torque.
Actually, and I know you know this already... probably just need that first cup of coffee... you want the pinion angle to be about 1* lower than the driveshaft angle to help compensate for when the pinion shaft raises a tad due to torque. When there is a CV driveshaft, you definitely don't want the pinion angle even a single degree above that of the driveshaft.
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Old 11-13-2011, 11:45 AM   #11
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Quote:
Originally Posted by Jerry Bransford
Actually, and I know you know this already... probably just need that first cup of coffee... you want the pinion angle to be about 1* lower than the driveshaft angle to help compensate for when the pinion shaft raises a tad due to torque. When there is a CV driveshaft, you definitely don't want the pinion angle even a single degree above that of the driveshaft.
Does make more sense. Torque makes the axle wrap forward therefor pinion up towards cab. Not sure why I thought in head it goes other way. Jensen the traction bars on my truck. To bottom of axle
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Old 11-13-2011, 02:59 PM   #12
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Just adjusted my arms 2 full turns out to point it up more. Still according to my angle finder im almost 9* away still. While there I found my rear ujoint was knocking around sloppy so that could be some of it. I'm gonna go to friends shop and get a second reading w a smaller style angle finder an hopefully get accurate numbers. Test drive before an was pretty much same thing.

I'll replace ujoint an might do tranny mount now too. It has play but not sure ehat is bad an good.
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Old 11-13-2011, 03:17 PM   #13
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Also for my pinion angle. As I lengthen the uppers which are pretty far out of the threads now but I'm not worried about it. Should I push the lowers back some now? Jeep was aligned perfectly before so I do not want to compromise that. But my lower (Clayton offroad short arms) Are near as short as they go. I'll send picture in a bit of how much each are lengthened. Just curious. Hopefully get my angle better and be set!

As I do this the spring plate lower obviously gets slanted back. Which is opposite of upper spring plate. So the banana clip effect on my spring is ok?
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Old 11-14-2011, 06:01 AM   #14
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subscribed because ill be doing this in a month or so, got my SYE / tattons CV driveshaft sitting on my toolbox right now lol saving up for some currie adjustable control arms, guess ill go buy a good magnetic angle finder too!
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Old 11-14-2011, 05:37 PM   #15
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Bump up for my last few questions
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Old 11-14-2011, 05:45 PM   #16
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Quote:
Originally Posted by Jerry Bransford
Actually, and I know you know this already... probably just need that first cup of coffee... you want the pinion angle to be about 1* lower than the driveshaft angle to help compensate for when the pinion shaft raises a tad due to torque. When there is a CV driveshaft, you definitely don't want the pinion angle even a single degree above that of the driveshaft.


I was having a stressful day Jerry. Thanks for keeping me honest.
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Old 11-14-2011, 08:47 PM   #17
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Any one suggest a MML?
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Old 11-15-2011, 09:03 AM   #18
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Here's a picture of my driver side mm. Looks to me to be a MML already. I have an Electric fan so can't tell if it's been modded for MML but from looks of where radiator angle is an how center of motor where stock fan was I would say its pointed up some. And still I need more angle!
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Old 11-15-2011, 02:40 PM   #19
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Bump. Anyone comment on my motor mount issue?
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Old 11-15-2011, 04:30 PM   #20
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That looks stock to me.

I have a brown dog MML.
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Old 11-15-2011, 10:34 PM   #21
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Measured 3.5" from bottom of mounting surface to center of motor mount bolt. Had friend measure stock YJ which was 2.5". So unless someone can help verify this I think I already have a mml. Wish I didn't cause it would help w angles. I adjusted my Clayton arms in rear, lowers r bottomed out short and uppers have to be to MAC they can be. They felt wiggling like no threads were left until I tightened lock nut. Drove better but still not great. I also replaced u joint that was bad on rear shaft by pinion. I plan on ordering tranny mount hopefully tightens up
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Old 11-16-2011, 07:05 AM   #22
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Ok so I got vibrations better. I'm still 5* off an my uppers r maxed out and lowers are bottomed out. I am thinking something else. My driveshaft and how it mounts to my transfer case. I did an SYE on my old YJ and remember They make short ones as well to help driveshaft. But REN this one I have seems way longer than a standard SYE kit. Anyone wanna say that's true. I just want all this correct so I'll buy a new SYE to be safe there easy enough to do.

Once again PO didn't do to much correct in any way on this jeep. An it's a 231 case not a rubicon one. So I believe. Says NP231J if I can get a shorter SYE nose I think I would have a much better angle of driveshaft
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Old 11-16-2011, 11:46 AM   #23
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Bump up for some help
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Old 11-16-2011, 11:43 PM   #24
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I'm not sure so this a bump a little bit of info.

Rubi cases 241-j does not require a SYE. I have seen super short SYE's before but that one does look long. I would pull the front shaft to make sure it is the rear and not the front causing the problems.

Another idea is the rear drive shaft could be bad. If the angles are right it might be the shaft. If you know of someone close bye, see if you can borrow there shaft for a quick test.
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Old 11-16-2011, 11:47 PM   #25
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I suppose. I think I get a lot of wiggle from the tranny mount I took a close look and its not to good I think. A tab is broke off, looks of the new one it was a dowl type rod going from one side to other under the rubber, thats not there any more haha. Just ordered one hopefully comes asap and I'll change it. Won't be using jeep until next week anyway so I'll mess with then. Im getting tired of messing with non stop crap like this. I need to buy new some day.

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