|05-01-2013 10:53 PM|
|037jeff||Your were absolutely right. I brought the pinion angle down and when I adjusted the CA's they were all the way in. I was a little nervous, however the driveshaft angle increased to 12* and the pinion angle is at 12* now. Vibration is GONE! Thanks to all.|
|05-01-2013 04:53 PM|
|JKralph||yup, as previously stated, don't worry so much about the numbers, just try to get the driveshaft and pinion as close to parallel as you can without going over.|
|05-01-2013 04:46 PM|
|05-01-2013 11:43 AM|
|037jeff||Thank u! At that spot the angle is 16* and my driveshaft is at 10*. So I need to come down no more than 7*. This hopefully will explain the vibes I have been getting.|
|05-01-2013 11:22 AM|
Don't worry about the angle numbers themselves, just get the pinion to the same angle as the driveshaft.
I measure the pinion angle off one of the two flat surfaces on the back of the axle on either side of the diff cover as below. Those two round machined surfaces are exactly perpendicular to the pinion angle so the angle finder can easily compare the two angles as shown.
|05-01-2013 11:15 AM|
Another question. When I measure the pinion angle, I am measuring off the flange on the passenger side. Which is telling me the angle is at 9*. If I measure off the flat part on rear of axle near the fill hole I get an angle of 16*. Which should I go off.
The passenger side flange.
Or this flat part I am pointing at
|05-01-2013 11:09 AM|
|Jerry Bransford||As a fine point, make sure the pinion shaft angle ends up equal to or no more than 1-2 degrees under that of the driveshaft. It cannot be any higher at all. Under acceleration, the pinion angle tries to lift a tad so don't have it too high to begin with or vibes will be the result.|
|05-01-2013 11:02 AM|
|037jeff||Thanks everyone for your responses. I am going to loosen all rear suspension components to get the pinion angle to match the rear driveshaft angle. I will repost the results.|
|05-01-2013 10:48 AM|
|Jerry Bransford||With an aftermarket CV driveshaft, the kind that has two u-joints at the front & one u-joint at the rear, the pinion angle must be the same as the driveshaft... as below. I.E. the pinion shaft must point directly at the CV joint.|
|05-01-2013 10:43 AM|
The track bar is probably holding it from moving. You are going to need to loosen all rear suspension components and retighten anyway so they won't be in a bind once the pinion angle is reset.
|05-01-2013 10:37 AM|
Here's some pictures
|05-01-2013 10:24 AM|
|037jeff||It's a double cardan joint. That's what I wanted to do was move the pinion angle 1* below the TC but I can't get it to move. I was under the assumption loosening the upper CA would do the trick but it didn't. That's where I need help.|
|05-01-2013 12:18 AM|
patrick brings up a good point
OP, does your rear driveshaft have one or two u joints where it meets the tcase? Or do you have a picture of it?
|05-01-2013 12:06 AM|
|Patrick H||If you have a double cardan shaft (most people mistakenly call them CV joints) you need to raise your pinion angle. It needs to point straight at the transfer case basically, or 1 degree down; one degree lower than the drive shaft angle.|
|04-30-2013 11:51 PM|
|037jeff||I didn't think of loosing everything else up I figured the upper CA. would be enough. I forgot to mention my TC angle is 7* the driveshaft is at 10* and the pinion angle is 8/9*. It's a 05 Rubicon LJ with 28000 miles lite off roading. I am second owner. It has 4" RE short arm lift with RE rear CV drive shaft.|
|04-30-2013 11:43 PM|
|JKralph||hmm if I hit that problem I think the first thing I would do is loosen all of the control arms and the track bar to make sure they aren't binding while you are trying to adjust your angle.|
|04-30-2013 11:38 PM|
I have investigated and read up on and asked and PM'd Jerry. I have come to the conclusion my pinion angle needs to come down by 2 degrees to match my TC angle. Long story short a little vibration I feel and after investigating seems my angles are a smidge off. It's either that or a bad u joint anyways. So my million dollar question.... I want to lower my rear pinion angle. Today I took both rear control arms off after placing jack under rear pinion to hold it in place. When I went to lower the jack a little to lower the pinion NOTHING moved! I pulled on the drive shaft to see if I could get the pinion angle to change and nothing. Granted I have never done this before and looking online I think I was doing it right. Everything online says to lengthen rear CA to lower pinion angle. To do that u need to take them off. ( I have RE adjustable rear CA) So I expected after taking off the CA the pinion/axle would want to move. It didn't budge. So how do I get the pinion angle to move down 2 degrees. PLEASE I am open to all suggestions, criticism and ridicule. Thank u!