Hub Assy Difference
Elder User
Joined: May 2004
Posts: 936
Likes: 1
The change may be small enough that the rotors and hubs can be mixed sometimes with no problems. They changed the hub assembly so they could change the rotor design. The rotors on pre-3/99 trucks warp easily. Mine warped and I believed the dealer when they blamed it on the hubs leaking oil onto the rotors - what a lie now that I know how the bearings and hub are a sealed assembly.
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Let's see, Dick, a little over 1/16 of an inch can bind something enough to ruin a bearing. But, and if, the clearance, for some unknown reason, is maintained between the caliper housing and the rotor, then all should be fine. I'll buy that. Thanks again.
mizzitch,
I'm starting to think that a tolerance allowance in manufacturing can allow the two to tango, but it depends entirely on that tolerance, on that vehicle. The way I'm starting to picture this is that another truck might not fare well mismatching the two. At least that's the only way I can see how I'm able to get by with it.
And same here Dick. 11/98 build date with factory rotors. No warpage at all.
mizzitch,
I'm starting to think that a tolerance allowance in manufacturing can allow the two to tango, but it depends entirely on that tolerance, on that vehicle. The way I'm starting to picture this is that another truck might not fare well mismatching the two. At least that's the only way I can see how I'm able to get by with it.
And same here Dick. 11/98 build date with factory rotors. No warpage at all.
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
I have a newer bearing I could measure it and compare it to the one's on the truck..
The early bearings are only avail at th dealer for way too much. I can get the newer ones for $235.00 or less all day long. The one I have I got on ebay for $100.00 NIB.
Dick
The early bearings are only avail at th dealer for way too much. I can get the newer ones for $235.00 or less all day long. The one I have I got on ebay for $100.00 NIB.
Dick
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
I appreciate the offer, Dick, but no need to go to all that trouble.
I paid $174.99 for this assy - mfg by National...I guess. Can't tell these days, but they're the ones that hung their name on it.
I paid $174.99 for this assy - mfg by National...I guess. Can't tell these days, but they're the ones that hung their name on it.
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
OIC 
No, Dick, I did not weld the wheel on....
I wonder, if the .070" inward was the only change in the hub assembly, how it made that much diffence to the rotor?
Can you tell I'm a little perplexed?
No, Dick, I did not weld the wheel on....
I wonder, if the .070" inward was the only change in the hub assembly, how it made that much diffence to the rotor?
Can you tell I'm a little perplexed?
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Just thought I'd give ya'll an update.
Took my wheel off this morning and, using the old wheel bearing hub assy, measured the differences. From my observations there is only one difference: The post-3/99 bearing assy that I installed sets outward about .070" further than the existing pre-3/99 bearing assy.
That is the only difference.
What does the difference mean? Nothing important that I can see. Your rotor will ride closer to the caliper, outbound, but it will not touch, nor (from all I can tell) will it hurt a thing.
I'm still going to keep an eye on it and if anything changes, I'll be sure to holler...
You might ask, "Why not get the per-3/99 to begin with?"
Because they're as scarce as hens teeth and cost more. I posted this just as an FYI and am not recommending the two can or should interchange - just posting my results.
Took my wheel off this morning and, using the old wheel bearing hub assy, measured the differences. From my observations there is only one difference: The post-3/99 bearing assy that I installed sets outward about .070" further than the existing pre-3/99 bearing assy.
That is the only difference.
What does the difference mean? Nothing important that I can see. Your rotor will ride closer to the caliper, outbound, but it will not touch, nor (from all I can tell) will it hurt a thing.
I'm still going to keep an eye on it and if anything changes, I'll be sure to holler...
You might ask, "Why not get the per-3/99 to begin with?"
Because they're as scarce as hens teeth and cost more. I posted this just as an FYI and am not recommending the two can or should interchange - just posting my results.
Logistics Pro
Joined: Aug 2005
Posts: 3,884
Likes: 180
From: Morgan Hill, CA
Thanks for keeping us up to date Big Orn. I'm interested in your long term results. It's definately good for early 99 people to know they can get out of a jam if they need to. How many miles have you put on them?
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Originally Posted by Fat Diesel
Thanks for keeping us up to date Big Orn. I'm interested in your long term results. It's definately good for early 99 people to know they can get out of a jam if they need to. How many miles have you put on them?
I don't have but around 480 miles on it so far, but enough that I would think there would be some sort of scoring or warpage on the rotor. Of that, though, more than 80% is rough terrain and heavy loads.
Short term results are A-OK.
On another note: That needle bearing (for the axle shaft) in the rear of the old hub assy looked as good as new. Another FYI.
Last edited by Big Orn; Mar 10, 2006 at 09:38 PM.