brake rotor rubbing on knuckle

[BPB]

I changed my front driver side axle shaft on my mj. last night, I replaced the whole inner, outer, hub assembly. I went to drive this morning and the front ds wheel wouldn't turn. I took off the wheel and brakes and the rotor was digging into the knuckle.... what the hell? I pulled the assembly off an xj. it's the same right?

[500 MJ]

What year XJ? I don't know if it matters or not, but someone might need to know to help diagnose the problem...

[BPB]

i'm not sure.

[ComancheKid45]

XJs changed brake rotor designs at some point in time.....i put brake rotors on a customers XJ back when i worked in a dealership that rubed on the knuckles and there were 2 choices

[DirtyComanche]

There's differences between 2x4 and 4x4 models, plus differences based on the year. So yeah...

[Eagle]

There are more than two permutations and combinations.

 

http://comancheclub.com/forums/viewtopi ... s&start=15

 

See my long post on the second page. Capsule summary: ALL parts (hub, rotor, caliper and knuckle) have to come from the same "generation" or you have an interference fit.

[BPB]

That helped me out :wrench: ...... btw you guys are much more helpfull than the ones on NAXJA :hateputers:

[mjdoa]

ALL parts (hub, rotor, caliper and knuckle) have to come from the same "generation" or you have an interference fit.

 

 

^Best answer yet.

Had the same problem when I put '90 xj

axles on my '88 mj.

Had to change ALL the parts.

Front and rear.

[Eagle]

The rear is a whole different can of worms. From 1986 (1984, for the XJ) through 1989 the Dana 35 (most, anyway) had 10" x 1-3/4" drums, and the Dana 44 (most, anyway) had 10" x 2-1/2" drums. And the offset on the backing plates isn't the same, so if you try to upgrade the 1-3/4" drums to 2-1/2" just by buying new drums -- the back/inside flange of the drum bottoms out on the backing plate before the center part of the drum makes contact with the hub on the axle. So to make this change you have to replace everything from the backing plates out.

 

And then in 1990 Chrysler switched from the two 10" drums sizes to 9" x 2-1/2" drums. There's no reason you can't just swap a 90+ rear axle into an older XJ or MJ, or go the other way, but it's another case of then having to remember to buy parts according to the year of the axle rather than the year of the vehicle.

[reson46]

Here's a pic of some of the differences. I've got at least three different types of D30 unibearing hubs in my collection.

 

 

Willy

[pingpong]

had a similar issue when I went to put 92 era wheel hubs on using 87 era rotors.. It don't work.

 

I did find out that a NON "C" clip D35 axle brake backing plate is the same as a xj d44 though. That being said, I guess you could bolt the whole setup on, using the d35 drums, and it SHOULD work

[Eagle]

I did find out that a NON "C" clip D35 axle brake backing plate is the same as a xj d44 though. That being said, I guess you could bolt the whole setup on, using the d35 drums, and it SHOULD work

If the backing plate is the same, then the axle length is different. Several years ago I got my hands on a Dana 44 rear axle. It had backing plates, but no drums. "No problem," sez me, "I'll just use the skinny D35 drums until I can afford new D44 drums."

 

Visually, there was definitely more of a "bell" shape to the center web portion of the D35 drums than on a nearby D44 axle. I was sure it would work -- but it didn't. The back (open rim) of the drums bottomed out on the backing plate before the center "hat" made contact with the axle hub. So either the backing plates are different, or the D44 axle shafts are longer (or the D44 axle tubes are shorter -- hadn't considered that possibility before). Something is different, 'cause it didn't work like it was supposed ta.