Chevelle front spindles not the same wheelbase - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-13-2012, 11:37 AM
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Chevelle front spindles not the same wheelbase

I tubbed my Chevelle and used the lower ball joint zerks to set wheelbase on the new rear end. After putting the frame back under the car the wheel opening was off 1/2". I measured from frame holes to ball joint and see the difference forward but going to the rear the measurements are all the same both sides. Body/frame holes line up and all the new body bushing are in exactly the same place as the old ones. I am 1/16" off doing x measurements. It has never been wrecked and I can't imagine it could be off that much and everything line up. I used the old race car string method off the frame to square the tires and now the openings are identical so it appears that the frame was built that way. Did GM have that much tolerance in the old days? Will it matter as long as it is square with the frame?

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Old 04-13-2012, 01:07 PM
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It sounds to me that one of the front zerk fittings is farther forward. As goofy as that sounds, THAT is the crux of the problem, you measured off of a variable point, not a "control point".

The holes under the frame, those holes you see all over that aren't even used for anything, those (maybe not all of them, but most of the time all of them) holes are "perfect". They are "control points" used in manufacturing the frame, they are used in jigs and reference.

The zerk location has many variables from the ball joint being a little different one side from the other. Be it a different brand or simply a little different location of the zerk. To the lower control arm bushings being worn or different. So that zerk wouldn't be a good spot to measure ANYTHING, it is a very poor reference.

You need to use the control points under the frame and put your axle where it needs to be.

Brian
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Old 04-13-2012, 01:50 PM
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I get the feeling that the body may be offset by that much......Most of us have seen where the wheels are further from the body on one side of the car....Same thing I am guessing
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