Hub Assy Difference
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Post Fiend
Joined: Jun 2003
Posts: 5,643
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From: NE Texas
Hub Assy Difference
What is the differences in the pre-3/99 and post-3/99 wheel bearing hub assemblies on these Super Dutys? Can't find a "tech" that knows.
Reason I'm asking is that I've just had a post-3/99 installed on my truck and all seems fine. The mechanic said that everything "fit like a glove". To maken sure I went down in the pasture where the mud was about 18" deep and tried to get stuck. The front axles/wheels/tires were quiet with no popping or grinding at all. Locked and unlocked like new.
Anybody got an idea?
My rig: 1999 (build date 11/98) DRW, 4x4, manual tranny, V10. 4wheel ABS ESOF
Reason I'm asking is that I've just had a post-3/99 installed on my truck and all seems fine. The mechanic said that everything "fit like a glove". To maken sure I went down in the pasture where the mud was about 18" deep and tried to get stuck. The front axles/wheels/tires were quiet with no popping or grinding at all. Locked and unlocked like new.
Anybody got an idea?
My rig: 1999 (build date 11/98) DRW, 4x4, manual tranny, V10. 4wheel ABS ESOF
Logistics Pro
Joined: Aug 2005
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From: Morgan Hill, CA
You need to run the later rotors with the later hubs. From what I understand there is a 0.070 difference in the sizing where they meet. I've changed my early 99 hubs to the later geometry, but I also put on the later rotors. It's the braking where the issue will be, not the driving or turning.
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Joined: Oct 2004
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Originally Posted by Fat Diesel
You need to run the later rotors with the later hubs. From what I understand there is a 0.070 difference in the sizing where they meet. I've changed my early 99 hubs to the later geometry, but I also put on the later rotors. It's the braking where the issue will be, not the driving or turning.
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Originally Posted by Texascadillac42
This is what I have heard as well. From what other people have told me, an early hub with a later rotor wont physically work together, so if there was going to be a problem, it would have already happened.
Maybe it's like the Bigfoot/Chupacabra myth...you hear about such, but there's absolutely no proof to back it up...
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Post Fiend
Joined: Jun 2003
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From: NE Texas
This here is a tough one, ain't it? 
I got a number for the "up to 3/99" which is HA590425 (Timken).
The National (BCA) number for the "from 3/99" is 515025, which I had installed on my "up to 3/99" truck. Called another dealership today and the tech told me that it won't fit. I asked him why. He didn't know. Sounds like Bill Cosby's kids...
I got a number for the "up to 3/99" which is HA590425 (Timken).
The National (BCA) number for the "from 3/99" is 515025, which I had installed on my "up to 3/99" truck. Called another dealership today and the tech told me that it won't fit. I asked him why. He didn't know. Sounds like Bill Cosby's kids...
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Just a little more info:
Got an email from an FTE Sponsor that he looked it up, but it didn't give the difference. The only thing he could find was a difference in fine/course threads for an SRW - which doesn't apply to me.
Still looking...
Got an email from an FTE Sponsor that he looked it up, but it didn't give the difference. The only thing he could find was a difference in fine/course threads for an SRW - which doesn't apply to me.
Still looking...
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Elder User
Joined: May 2004
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You want to run the hub that matches the rotor. They are made for each other and I have read in TSBs that they cannot be mix matched - Ford Mo Co. will not cover repairs due to the tech using the wrong rotor - it would be the tech/dealer's fault.
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Originally Posted by mizzitch
You want to run the hub that matches the rotor. They are made for each other and I have read in TSBs that they cannot be mix matched - Ford Mo Co. will not cover repairs due to the tech using the wrong rotor - it would be the tech/dealer's fault.
What difference is there in the rotors?
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Makes sense.
Still, what part of the hub assembly would affect that - or, what affect would the rotor have on the hub assembly that a whole different setup be made?
I contacted FoMoCo via email after their robot refused to gimme her maiden name...
...maybe they'll get back with me before the other side goes out and I have to replace it with the wrong part... 
Still, what part of the hub assembly would affect that - or, what affect would the rotor have on the hub assembly that a whole different setup be made?
I contacted FoMoCo via email after their robot refused to gimme her maiden name...
...maybe they'll get back with me before the other side goes out and I have to replace it with the wrong part...
Logistics Pro
Joined: Aug 2005
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From: Morgan Hill, CA
Originally Posted by Big Orn
Makes sense.
Still, what part of the hub assembly would affect that - or, what affect would the rotor have on the hub assembly that a whole different setup be made?
Still, what part of the hub assembly would affect that - or, what affect would the rotor have on the hub assembly that a whole different setup be made?
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Thanks for the reply, Fat Diesel.
There's absolutely no stress on anything, anywhere. The brakes don't pull and under load I apply the brakes pretty heavy sometimes.
If the hub surface was moved outward .070" then I would think it would be better. Is this what they've done...just moved the hub surface, rotor contact outward? Or was it inward? Seems like it would have to be one of those two.
There's absolutely no stress on anything, anywhere. The brakes don't pull and under load I apply the brakes pretty heavy sometimes.
If the hub surface was moved outward .070" then I would think it would be better. Is this what they've done...just moved the hub surface, rotor contact outward? Or was it inward? Seems like it would have to be one of those two.
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Thanks, Dick.
My question now is Why? If the caliper bracket is not out of alignment, why then does it need shims? The newer hub assembly is not causing the rotor to bind on the caliper at all.
I know that FoMoCo is not a herd of idiots and would not create another design if they could upgrade an existing design. What I'm having trouble with is that I'm hearing there's a difference in design, but can't seem to find out what it is.
I now have enough miles on the replacement hub for it to have shown some sort of trouble. I checked it a few minutes ago and there's nothing wrong with it that I can tell. It's got me puzzled to tell you the truth.
My question now is Why? If the caliper bracket is not out of alignment, why then does it need shims? The newer hub assembly is not causing the rotor to bind on the caliper at all.
I know that FoMoCo is not a herd of idiots and would not create another design if they could upgrade an existing design. What I'm having trouble with is that I'm hearing there's a difference in design, but can't seem to find out what it is.
I now have enough miles on the replacement hub for it to have shown some sort of trouble. I checked it a few minutes ago and there's nothing wrong with it that I can tell. It's got me puzzled to tell you the truth.