Rear blocks
Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
just went out and looked under X, finally. It is a DC driveshaft after all. I'll have to check the angles of the tcase and the pinion next, but I can clearly see that the pinion is almost parallel to the ground. From owning a TJ and modding it for years (before I took a loss trading it on the X) I know that the pinion angle and the driveshaft have to be in line, maybe pinion down a degree or two due to rotation of pinion under load. Looks like I'll have to get shims to install in the rear. Also I have cut down front secondary springs to add in as AAL as well. The 4" blocks made the X exactly level, now I want the rear up just a little over the front. Just like my Jeep, the mods never seem to end.
No real reason to check angles up by DC. The angles that matter are down by rear pumpkin. Pinion angle and DS angle = same. Or angle = 180 degrees depending on how you measure.
Remember if you get say a 6 degree difference, do not get a 6 degree shim. Changing pumpkin angle will also change driveshaft pitch.......based on its length (IE radius).
I always divide by 2 and add 1 degree to get me pretty close.
IE .... 6 DEGREE difference /2. Than I add 1 degree. In this example I would get a 4 degree shim. It may still be 1 or 2 degrees off but under power it wI'll be just wheRe you need it.
I would rather the pinion be 1 or 2 degrees "low" than dead on 0 degrees and rotate "up" 1 or 2 degrees under power.....but that's just me.
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