BEARING HUBS!!!! What's the deal?!?

[LOCKED UP]

Sorry I was hopped up on Nyquil...

Here's what I know:
...MM hub conversion. The instructions say nothing about any difference from 98-00. This leads me to believe that knuckles are the same for at least 95+ (when the break is in the kits which corresponds with the change in u-joints), though I suspect the knuckles are the same from 93-01.....

93 ZJ hubs I have are the same depth to mounting surface as the 98 XJ hubs I have. My stock 00 XJ hubs sit "in" about 1/8 inch.

A while back I swapped on my 98 HP d30, using the 00 rotors. Seemed to have no problem at all, but perhaps my rotors were sitting "out" 1/8" due to this difference? I had removed the dust shield so it would have been <1/8".

Either way, I had no apparent problems.

Now:
I have 93 ZJ Knuckles (which should be the exact same as 98 XJ or 00 XJ knuckles... right?) on my 98 HP XJ axle. The rotors on there are from a 00 XJ and the hubs are brand x from pepboys. I believe they were the same "depth" as the 00 hubs....

Since I now have hubs similar to the 00 hubs & am using the 00 rotors it should be lined up straight again with the exception of no dust shields.... right?

For the hub conversion I'm planning, the rotors I've found are .125" thick & cast. Instructions call for .25" thick cast. Local 4x4 shop has done several of the conversions and they use the .125" cast rotors with "no problems". So does this mean that all the conversions thay have done cause the rotor to be off by .125"? Hell, one guy I know got the stock composites machined and ran them far a few years before they broke....


So my questions are now:

1. Is a 93 ZJ knuckle is the same as a 95-01 XJ knuckle?

2. If the rotor isn't centered between the brake pads how do I know? How uncentered can the rotor be and still be OK?

 

[brcomputer]

BTT .... anybody?

 

[CheapXJ]

the caliper sits on slides and will self center to a degree.

for optimal strength, the rotor should sit as close to the centerline as possible, honestly, I would not worry one bit about it, but do try to find the 0.25" thick cast rotors, they are better for the application, and I've seen a .125" used with the warn conversion crack out at the center (but he was runnin 38" boggers on a D30 too )

as far as I have seen, the XJ/ZJ knuckles appear to be identical. I know for a fact that you can swap calipers/pads between a 95 XJ and a 94 ZJ.

now, a question from me...
the hubs on your 00 XJ you say are 1/8" different than your 98? were the rotors on your 00 XJ full cast or composite? thickness? hat depth (inside)

I'm still running 1/8" spacers on my composite rotors, and now with 33's and some serious wheelin, I need to get it done right.

 

[XJoachim]

AFAIK there are in fact 3 different hubs for the 5 x 4.5 wheel pattern.

Dana Spicer Part 43378 is fo Dana 30 up to 1990
Dana Spicer Part 43379 is fo Dana 30 from 1990 up until today
Dana Spicer Part 43380 is fo Dana 30 1990 only

 

[Eagle]

Part numbers for the different hubs, (dealer says that ALL hubs from 90-2001 are the same, as well as those found on TJs. I KNOW that this is incorrect!)

Dealer lied to you.

I had to go to my dealer for a new clutch hydraulic line today, so I asked about this. There are in fact three (3) hubs, but only two (2) knuckles.

Hubs:

84-89 p/n 53000228
90-99 p/n 53007449AB
00-01 p/n 5016458AA

Knuckles:

84-89 p/n 53000625 Left
.................53000626 Right

90-01 p/n 52067577 Left
.................52067576 Right

We didn't have time to look up part numbers, but he said the hub change at 2000 was because DCX went back to a full cast rotor in 2000. The cast rotor (he said) is not available through any aftermarket source, and he said he sells a ton of 'em.

 

[LOCKED UP]

now, a question from me...
the hubs on your 00 XJ you say are 1/8" different than your 98? were the rotors on your 00 XJ full cast or composite? thickness? hat depth (inside)

I'm still running 1/8" spacers on my composite rotors, and now with 33's and some serious wheelin, I need to get it done right.

I thought they were composite but now I don't know. I'll check all that when I pull them off this weekend.

 

[wascobi]

eagle
those part numbers are just for xj's? or does it meam '97-'99 tj hubs will fit my '90 xj?

 

[Eagle]

I only asked about XJs. I think they should be the same, but I don't know.

 

[Ed A. Stevens]

Eagle, do you agree the results of this thread could make good Technical article?

 

[Eagle]

Eagle, do you agree the results of this thread could make good Technical article?

Yes.

But it should probably be "fleshed out" with a tad more research, to include part numbers by year for rotors, and also for the corresponding parts for ZJs and TJs.

 

[xjwoody]

So... This used 1995 hub I pulled out of a salvage will NOT replace the damaged on on my 1987..??!?? B-O-G-U-S...

 

[dakotus]

sorry to re-hash this old ass thread.

BUT.....

Im looking for a wheel bearing hub assembly replacement for a 99 cherokee. There are so many part numbers thrown around in this thread Im so confused. Does anyone know a part number for the part I need??
How do I know if I have full or composite rotors? does it matter??

thanks

 

[XJack]

You can generally tell if your rotor is composite or cast by the center section. If you have a textured material that is a different metal than the brake surface portion with a slight lip where they were pressed together then they're composite - 2 piece rotors.

If the rotor is one piece inner and outer, same material , then you're running cast rotors.

I'd bet you have two-piece rotors, and will likely need a 90-99 p/n 53007449. If you have a one-piece rotor, add AC to that part number.

It *does* matter, so check before you buy.

Crown automotive has a good brake parts catalog to help you see what components go with which models.

http://www.crownautomotive.net