1979 K25 front axle alignment - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-14-2019, 12:49 PM
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1979 K25 front axle alignment

I have what I think is a problem with my 1979 GMC K25 where the front axle is shifted off center toward the driver side. The driver side tire is flush with the fender, and the passenger side is about 2 inches in from the fender. I know I have a sagging leaf on the pass. side because it leans to that side in the front, but what could cause the axle to be off center. The passenger side tires follow the same track, but the front driver side is about 2 inches outboard of the rear tire. Another thing I noticed, which could just be an illusion due to the truck leaning, is that the passenger side tire has more negative camber than the driver side, which looks to be straight up and down. Any help is appreciated, I want this thing to track straight

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Old 03-15-2019, 07:16 AM
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Are you sure you have the right type and size of wheels on the front? I've never seen stock steel 8 bolt GM wheels with more offset, but they used 8 bolt wheels on 3/4 ton trucks from different manufacturers. A wheel from the wrong truck would probably bolt on, but might have a different offset. Another possibility is that one of the hubs is different from the other.

If it has the correct front axle and the spring perches are not bent, there isn't much else that's adjustable to shift the axle from side to side. You can adjust camber at the knuckle, but I wouldn't worry about that until you get the axle centered and even from side to side.

IIRC, my K25 front wheels are lined up just inside the lip of the front fender. I've attached the best picture I could find that was taken at an angle that lets you see the alignment better. This is with 16" steel wheels and 245/75R16E tires.

Bruce
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Old 03-15-2019, 11:31 AM
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Quote:
Originally Posted by 75gmck25 View Post
Are you sure you have the right type and size of wheels on the front? I've never seen stock steel 8 bolt GM wheels with more offset, but they used 8 bolt wheels on 3/4 ton trucks from different manufacturers. A wheel from the wrong truck would probably bolt on, but might have a different offset. Another possibility is that one of the hubs is different from the other.



If it has the correct front axle and the spring perches are not bent, there isn't much else that's adjustable to shift the axle from side to side. You can adjust camber at the knuckle, but I wouldn't worry about that until you get the axle centered and even from side to side.



IIRC, my K25 front wheels are lined up just inside the lip of the front fender. I've attached the best picture I could find that was taken at an angle that lets you see the alignment better. This is with 16" steel wheels and 245/75R16E tires.



Bruce
The wheels are not stock, but they are all 4 the same. Tires are 235/85r16. I'll take a look this coming week and see if I can find anything off about it

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Old 03-15-2019, 01:50 PM
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Quote:
Originally Posted by 75gmck25 View Post
Are you sure you have the right type and size of wheels on the front? I've never seen stock steel 8 bolt GM wheels with more offset, but they used 8 bolt wheels on 3/4 ton trucks from different manufacturers. A wheel from the wrong truck would probably bolt on, but might have a different offset. Another possibility is that one of the hubs is different from the other.



If it has the correct front axle and the spring perches are not bent, there isn't much else that's adjustable to shift the axle from side to side. You can adjust camber at the knuckle, but I wouldn't worry about that until you get the axle centered and even from side to side.



IIRC, my K25 front wheels are lined up just inside the lip of the front fender. I've attached the best picture I could find that was taken at an angle that lets you see the alignment better. This is with 16" steel wheels and 245/75R16E tires.



Bruce
Youre K25 is beautiful by the way

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Old 03-15-2019, 07:09 PM
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EragonSuperH - thanks for the comment on the truck. The picture below (same as in my avatar) was taken in 2004 after we installed all the bright trim on the newly painted truck. The bed/box is a junkyard find from a newer truck, so it has fuel doors that were not stock in '75. The paint now has some wear and tear on it (14+ years), so its looking a little worn these days.

Bruce
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