I just changed the rotos,calipers and pads on my 4wd '99 Cherokee. I tightened everything up and when I started it and put in reverse it wouldn't move. I jacked it up and the wheels wouldn't rotate by hand, so I loosened all the lugs and the wheels would rotate fine. When I tighten 3 lugs on either wheel they begine to lock up again, 4 lugs or 5 and they wont budge. Any advice? thanks

 

sounds like rotors are hanging up on sumthing when bolted flush on hub. take wheel off,install lugs bulting rotor to hub. 'not to tight to mess up rotor'. and see whats binding.

 

Check with your parts supplier, you have the wrong rotors .

 

Bought at oreilly's. That's what I was thinkin too.Thanks

 

Nuts arent deep enough.

 

99's used two types of rotors. There is about a quarter inch difference in the "hat height" between them. If you have the taller ones and your XJ requires the shorter ones, they will bind against the knuckle when you torque the wheel nuts.

 

X2 just happend to one of my buddies. He has the same year and had the same prob.

 

Hmmm, I wonder why they didn't ask me or tell me about that at O'reilly

 

Why the differnce, ABS and non ABS maybe?

 

Difference: Could be one is whats called a pilot hub (it sets on a lip on the hub) and Stud Pilot that actually centers on the studs.
Just a thought on the reason for the difference.
It could also be the change over year they went purely metric.

 

Thanks for the info, but what should I tell the guy at Oreilly when I take them back for a swap. Also, I checked all the part numbers on the boxes against the part #'s online and they all match. I only found one part# for the rotors at Oreilly's and it's what they gave me.

 

Well I think I figured it out. Two different parts #'s on the Oreilly site, ones for the 2wd one for the 4wd and the genius gave me the 2wd rotors, the hats taller as the helpful member posted. Thanks

 

Definitely sounds like you have the wrong rotors. O'Reillys didn't ask you which ones you needed b/c O'Reilly's sucks! Next time go to AutoZone.

 

I believe the reason is at some point during the '99 model year Jeep changed to a "composite" front rotor. This means that instead of being machined from a single peice of iron, the center hub area is stamped steel like a brake drum and the outer friction area is cast around that. Where it gets confusing is that for the XJ's almost all aftermarket suppliers use a non-composite design because it's cheaper. So to accomadate the differing thicknesses of the hub area (the steel is thinner than the cast iron), the aftermarket suppliers must move the rotor's friction surfaces outboard by the difference in thickness. Think of it as they had to adjust the "backspacing" of the rotor.

 

You could say that about any of the auto parts stores. It depends on if they employee knowledgeable parts people. One reason I don't shop on "lowest price" alone. Try to find a store that has a large commercial- customer base. This type of customer won't tolerate incompetence and will usually stick with a store with a good parts staff.