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  #1  
Old 01-12-2006, 08:24 PM
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I Beam Help?

In the process of my rebuild I took the I beams off and rebuilt the kingpins, new busings, the works. Problem is I didn't mark which beam was front beam and which was back. I have put back together with Beam marked DTA-8-TA in the front with the passenger side knuckle. The rear beam is marked DTA-9-TA with the driver side knuckle. Did I assemble these back correctly? Help?

Thanks!!
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Old 01-12-2006, 08:29 PM
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both i beams are identical and interchange.
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Old 01-12-2006, 08:54 PM
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I'm taking your word for it....Thanks Gas Hog! Sure, didn't want to have to change. I was thinking that each beam would have differnt caster settings and would be off if I had put the knuckles back on the wrong beams. If anyone thinks Gas Hog is wrong please let me know.
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Old 01-12-2006, 10:44 PM
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I know he's right
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Old 01-12-2006, 11:58 PM
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Yes, but...a small amount of caster IS built into the beams. It can be adjusted with offset bushings when necessary, but it is there. Even the part numbers indicate a difference. If you switch them, your steering and stability may suffer.
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Last edited by Polkat; 01-13-2006 at 12:04 AM.
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Old 01-13-2006, 12:20 AM
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Quote:
Originally Posted by Polkat
Yes, but...a small amount of caster IS built into the beams. It can be adjusted with offset bushings when necessary, but it is there. Even the part numbers indicate a difference. If you switch them, your steering and stability may suffer.
sorry but they are the same left and right. they measure the same, ford says they are the same, left and right have the same hollander #. There is no caster built in. there is some camber, but the kinpin centerline is perpendicular to the axle pixot centerline. There are no offset bushings, they have to be reamed in place.

Lots of trucks have beams with 2 different forging #s, the forging #'s indicate kingpin size and each size has several #'s.

You haven't had one of these front ends apart have you?

Last edited by oldhalftons; 01-13-2006 at 12:30 AM.
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Old 01-13-2006, 11:48 AM
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Thanks guys. I just wanted to be sure before I got any further with the reassemble. I didn't think there was a difference, but I just wanted to be sure that caster wasn't an issue. My front end looks really good and tight now. New Kingpins, old one's were about frozen, and all new poly bushings. Pressure washed and sandblasted springs beams, front spring cups, and painted everything with a coat of chassis saver.
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Old 01-13-2006, 12:40 PM
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If your nuts that keep the kingpin in is in the frontyou are ok.
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Old 01-13-2006, 03:40 PM
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What's that go to do with anything if the beams are the same? You can put that back in either way can you not?
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Old 01-13-2006, 03:52 PM
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If one is set to be on one side and you put on the otherside it could change the caster or camber, right or wrong.
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Old 01-13-2006, 05:52 PM
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I think the bolt that holds the kingpin can go in either way as well, so I'm not sure if I could use that as a guide, but the census is that the beams are the same, so I think I'm going to leave it the way it is.
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Old 01-13-2006, 11:12 PM
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Okay, I'm confused, and you are right. The front suspension on these trucks are the only parts I've done little with. So how did the factory preset the caster? I read somewhere, and it made sense to me, that the caster was bent into the beam itself near the kingpin (the kingpin hole inclining slightly back) but you've assured me that this is not true!

Well, it doesn't appear that the radius arm pushes the bottom of the beam forward (or pulls the top back) as far as I can see (which would also tweak the shock, spring, and pivot bushing setup, which seems unlikely).

So can anyone explain to me how the factory initially set caster? Thanks.
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Old 01-14-2006, 01:11 AM
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caster is 0 degrees
front to rear, the kingpin is vertical. the beams have a camber angle built in, the top of the kingpin is a little bit outboard of the bottom.

Last edited by oldhalftons; 01-14-2006 at 01:17 AM.
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Old 01-15-2006, 08:39 AM
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So that would be a slight positive camber? Positive is if the top leans out further than the bottom or is it just the opposite. I can't remember. Also, there is a machined flat area on the front part of the beam where the kingpin lockpin goes. Is this the side where the nut and washer for the kingpin lock goes? I think I put those in backwards. I have the locknut on the backside, not the side with the machined flat area. Would that matter? It doesn't seem to interfere with anything.

Thanks.
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Old 01-15-2006, 09:27 AM
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Just from general knowledge, the camber would be built into the beam and it wouldn't matter which side it was on, it would be the same, and caster can be done by mounting the beams at an angle, it doesn't have to be set into the beam so even if it had a couple of degrees of caster it could still have identicle beams.
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Old 01-15-2006, 09:27 AM
 
 
 
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