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Old 07-21-2013, 02:41 PM   #1
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Pinion angle

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Been getting some slight driveline vibes recently, and looking at my rear pinion angle and drive shaft I'm wondering if I need to do a TC drop or if it's ok? U joints are all good 2.5" lift

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Old 07-21-2013, 04:36 PM   #2
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I would get some rear upper control arms and fix the pinion. Then go for a sye

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Old 07-21-2013, 04:43 PM   #3
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Its hard to tell, but your pinion angle (where your driveshaft connects to the axle) seems to be fine. Your upper connection at the transfer case looks too steep and that's where your vibrations could be coming from.

Can you post one more pic of the pinion angle as straight on as you can? If its the pinion angle, you would adjustable upper control arms, but I don't think it is.
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Old 07-21-2013, 04:50 PM   #4
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Actually, with the stock drive shaft, your pinion angle should be parallel to your transfercase output shaft angle. If new control arms are needed at all, it would be that the lowers need to be longer to make up for the lift that forced the dif at a downward arc (if using the stock ds), Adjustable uppers would be needed if going to an sye and dc drive shaft. If it were me, first thing I would do is put a few washers between the tc skid and the frame to see if that eliminates the vibes. If the lift has been on for a while without vibes and the vibes just recently showed up, I would still suspect a u-joint somewhere...don't forget the front.
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Old 07-21-2013, 04:57 PM   #5
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Ill get up some more pics when I get off work, one other thing I should mention is I just put a new clutch in last weekend, so everything got moved around. Trannie and engine mounts are all new. The trannie mount is a rugged ridge poly mount. Would that make any difference ? Motor mounts are JKS. I appreciate all the help. The vibration isn't that bad, mostly between 35-45mph then goes away. Adjustable control arms are in the plans come winter when I take it off the road. Soft top and a piss poor heater don't make for a fun winter ride.
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Old 07-21-2013, 04:58 PM   #6
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Quote:
Originally Posted by kylekae View Post
I would get some rear upper control arms and fix the pinion. Then go for a sye
Do I really need a SYE for only 2.5" of lift with 31" tires?
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Old 07-21-2013, 05:03 PM   #7
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Interesting they came after the clutch swap. What brand? You sure everything got tightened properly when installing?
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Old 07-21-2013, 05:04 PM   #8
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Quote:
Originally Posted by Water Dog View Post
Actually, with the stock drive shaft, your pinion angle should be parallel to your transfercase output shaft angle. If new control arms are needed at all, it would be that the lowers need to be longer to make up for the lift that forced the dif at a downward arc (if using the stock ds), Adjustable uppers would be needed if going to an sye and dc drive shaft. If it were me, first thing I would do is put a few washers between the tc skid and the frame to see if that eliminates the vibes. If the lift has been on for a while without vibes and the vibes just recently showed up, I would still suspect a u-joint somewhere...don't forget the front.
Ill give the washers a try, all u joints front and rear and axles are less than a year old and seem to be in good shape still. I don't wheel the jeep hard mostly just trails and running on the beach.
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Old 07-21-2013, 05:06 PM   #9
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Interesting they came after the clutch swap. What brand? You sure everything got tightened properly when installing?
I put in a LUK clutch kit, everything was tightened down, and checked. One thing I'm pretty anal about. Lol
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Old 07-21-2013, 05:11 PM   #10
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Usually driveshaft vibrations from a lift with bad u joint angles are the worst when taking off and when giving more throttle. If your vibration doesn't change when you go from on the throttle to off the throttle then I would say look elsewhere. Are the tires new or used. Could just be a bad balancing issue on your tires. Hope this helps.
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Old 07-21-2013, 05:56 PM   #11
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Usually driveshaft vibrations from a lift with bad u joint angles are the worst when taking off and when giving more throttle. If your vibration doesn't change when you go from on the throttle to off the throttle then I would say look elsewhere. Are the tires new or used. Could just be a bad balancing issue on your tires. Hope this helps.
Tires were on the jeep when I bought it 2yrs ago, they need replaced, but wouldn't a balance issue show up at highway speed? No shake in the steering at all, just a vibration from 35-45mph. Gonna start with washers on the skid plate and go from there. And go over the u joints again. Thanks for all the advice!
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Old 07-21-2013, 06:45 PM   #12
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Originally Posted by NavyDoc1 View Post
Ill get up some more pics when I get off work, one other thing I should mention is I just put a new clutch in last weekend, so everything got moved around. Trannie and engine mounts are all new. The trannie mount is a rugged ridge poly mount. Would that make any difference ? Motor mounts are JKS. I appreciate all the help. The vibration isn't that bad, mostly between 35-45mph then goes away. Adjustable control arms are in the plans come winter when I take it off the road. Soft top and a piss poor heater don't make for a fun winter ride.
A poly mount would transfer vibrations a little more than rubber, but I'm more suspicious of the fact that it started right after the clutch install. Maybe a drive shaft is a little out of balance and was installed 180 of what it was or something. If it were me, I think I would disconnect each drive shaft one at a time and drive it with the other to narrow down where it's coming from.

If you can get rid of it by dc'ing one of the shafts, then you know it's a bad u-joint or one binding, or out of balance ds, and if you still have it with either shaft, then it has to be an issue with the clutch/transmission.
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Old 07-21-2013, 07:33 PM   #13
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WaterDog I think ya hit it on the head!!! , when I got home from work I crawled under and looked at the driveshaft, sure enough my paint marks on the shaft were 180 off, when my buddy and I put everything back together he did the driveshaft. I just assumed he lined up the marks. To tired to mess with it now, ill do it in the morning and report back.
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Old 07-22-2013, 11:33 AM   #14
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Pulled the driveshaft and re aligned it, took it out on the high way and no more vibes!
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Old 07-23-2013, 05:50 AM   #15
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Glad you figured it out!
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Old 07-23-2013, 10:57 AM   #16
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Pulled the driveshaft and re aligned it, took it out on the high way and no more vibes!

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