RHCC

I've been trying to figure this out and it looks like I'm 10° off. Which of the images below should I be following? The bottom correct? I have a 2wd and the trans output was 0°.


untitled by Matt Kerr, on Flickr


Here's my pinion. (The gauge isn't totally flat so I think it's closer to 10°)


20160106_211236 by Matt Kerr, on Flickr

20160106_211346 by Matt Kerr, on Flickr

neverenuff

you should be following the lower diagram. The yoke from the transmission output should be parallel with the output yoke on the differential. I don't like where you are checking the pinion angle, as you stated that area is not parallel to the output yoke. I would put the angle finder on top of diff on the two casting bumps. Another way to do the same thing would be to put your angle finder on the diff cover bolts and across the face of the output shaft or yoke on the transmission. You are looking to see if they read the same or are off by no more than 3 degrees. Does not matter what the drive shaft angle is, you are only interested in being parallel between pinion and output shaft of transmission.

RHCC

Ok I placed the gauge on top of the diff on those cast pieces (can be seen in my first photo). I got 6-7.

For the trans output I tried again to measure on the little bell cover thing and it gave me 0, but I did a second measurement on the u joint (rotated DS until it was level) and got 3-4.

That seems right there in the 3 range but I have slight acceleration vibration and when I let off the gas and coast I get the nastiest grinding sound from the rear.

From what I read those are symptoms of the pinion angle being off .

ZJMAX

I would check for in and out play at the pinion yoke.

Max

RHCC

No movement, feels solid.

RHCC

Also the lift is brand new and the vibes and noise only started right after the install.

Tsaani97xj

Knowing RE generally gives mote lift than advertised your angle at the trans is likely what is causing your issue. I would lower your crossmember to reduce the angle there. At your lift height shimming just the rear is not going to be enough. I am one of the non SYE XJs around here at 5" of lift and a manual trans so Im closer to a 2wd driveshaft length. Using washers to drop the crossmember will allow you to adjust the drop to get it to the sweet spot. The thickness of a single washer can put you in or take you out of this range. I would start around 1/2" drop and see how it responds. Your rear angle doesn't look too bad. FWIW getting parallel at that lift heigjt is near impossible without causing the ujoints to bind without dropping and shimming.

50k miles without doing a SYE and quite a lot of trial and error to figure it out.

Not sure if a hack n tap is an option on a 2wd. If it is that would be a good option.

Best of luck to you.

RHCC

I will def try the washer way first because that will be cheaper and easier with different lengths. Thanks


Here are the pics from my latest measurements. My trans output was leaking before and I had replaced the seal. It seems to be leaking again now.


20160107_171737 by Matt Kerr, on Flickr


20160107_171024 by Matt Kerr, on Flickr

neverenuff

hack and tap is a great suggestion, regardless of T/C drop... probably better in long run

RHCC

I'd rather not go that route and try the shims or trans spacers. And I'm 2wd so, like Tsaani said, not even sure if hack and tap is an option.

freegdr

Angle finder on wrong on axle.

RHCC

How so? It's on the rear

LAF1269

It's a 2wd. What other pinion would he be measuring?

freegdr

Goes on yoke not housing guys.

freegdr

Different angles....