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Old 10-09-2011, 02:38 PM   #1
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Pinion Angle

Yet another question on pinion angles, but here it goes. I just installed my Adj arms and set the pinion angles, and have a bit of vibes still. I don't have an angle finder yet, but does this look at least close to right? I plan on getting an angle finder tomorrow, but not sure what the angle is supposed to be...? Thanks for any help.
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Old 10-09-2011, 02:42 PM   #2
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The pic seems like you have a direct shot from the diff, or maybe a bit too high.... 1-2 degrees lower on the diff side should correct it..

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Old 10-09-2011, 03:23 PM   #3
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The pic seems like you have a direct shot from the diff, or maybe a bit too high.... 1-2 degrees lower on the diff side should correct it..
That's a good opinion I agree with. 1-2 degrees lower at the most should take care of it.
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Old 10-09-2011, 03:29 PM   #4
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Yep bring the diff down a bit. When you drive it will tend to torque up. Now you are going up to high.
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Old 10-09-2011, 04:14 PM   #5
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I had the same problem. I pointed the pinion angle directly at TC output. I also set it up empty. Then, I loaded it up for a wheeling trip....full fuel, tools, recovery bag, 1 rear passenger. I ended up getting some driveline vibes, especially on steep uphills.
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Old 10-09-2011, 05:37 PM   #6
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So that would mean shortening the UCAs right?
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Old 10-09-2011, 05:45 PM   #7
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So that would mean shortening the UCAs right?
Yes. Kind of a PITA unless you get it right the first time. Or unless you have Savvy's nifty new control arms that let you adjust your pinion angle without taking the arm out of one of it's mounts. I wish I had those.
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Old 10-09-2011, 10:08 PM   #8
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One more question. I had to tear apart the t case to reseal with rtv (I had a leak) and I've got it mostly put back together. I just put the rear tail housing on (no yoke on the rear output shaft yet) and noticed a little forward and rear play in that rear output shaft. Is this normal or do I have to take it back apart and reinsert the shaft a different way? The t case is in 4 lo and works as it should and it can shift between the 4 ranges. Anyone know if that minimal movement front and back is ok/normal. Thank you guys very much.
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Old 10-09-2011, 10:15 PM   #9
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It's been years since I had to get inside of a t-case but I don't recall any fore-aft movement of the main shaft. Any leftover retainer clips?
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Old 10-09-2011, 10:29 PM   #10
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No I used them all. I'm baffled. I don't remember if there was any movement when I took it apart.
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Old 10-09-2011, 10:31 PM   #11
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No I used them all.
Based on that and you very likely being careful to get them seated properly, it's probably ok and good to go.
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Old 10-10-2011, 03:39 PM   #12
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What angle is my DS and pinion supposed to be? I just shortened my arms a quarter inch and put them back on and it feels like there are minor vibes.
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Old 10-10-2011, 03:44 PM   #13
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It's 1-2 degrees at the pinion...pinion being lower than the shaft.
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Old 10-10-2011, 05:11 PM   #14
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So putting an angle finder on the yoke the angle should be 1 or 2?
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Old 10-10-2011, 06:03 PM   #15
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Measure the angle on the drive shaft and on the axle. The axle pinion should be 1-2 degrees less than the driveshaft.
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Old 10-10-2011, 06:13 PM   #16
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But as the angle of the pinion changes doesn't the angle of the DS change?
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Old 10-10-2011, 08:38 PM   #17
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from Tom Woods Driveshafts



Quote:
Whenever installing a double cardan driveshaft it is important to position the differential to attain minimal joint angle at the differential end of the driveshaft (we’ll get into the reasons later). Admittedly, “minimal” is an ambiguous term. How much is allowable depends on what you expect and the type of suspension you have. Spicer suggests a minimum of 1/2 degree and a maximum of 1-1/2 degree. If you shoot for the middle (by their recommendation), this leaves you 1/2 degree for a margin of error. This works great on a drawing board, but it’s not too practical in the real world. I generally suggest 1 to 3 degrees. If you have a leaf spring suspension, the differential will wrap under load. If you have a coil spring suspension, there will be a lot less wrap, but you will still have some because of flexing of the control arms and the resiliency of the bushings. To define this minimal joint angle a little better, I suggest that with a leaf spring suspension you should leave a net joint angle of 1 to 3 degrees, and with a coil spring suspension 1 to 2 degrees. Keep in mind that you want to leave the pinion a little down rather than up. To restate this, I’ll give an example. If the slope of the driveshaft is 15 degrees, leave the slope of the pinion at 12 to 14 degrees with the leaf spring suspension and 13 to 14 degrees for a coil spring suspension. I want to emphasize: This is an example only; your exact settings will probably be different.

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