Ditto on the laser level I measured out the center of my front crossmember under engine. Then I set the level on the crossmember below radiator, shot towards rear of car with it line up on next crossmember back and could see exactly where the rear end was sitting. If this makes sense, I also used a digital tram guage set it up on 2 jack stands one by the front hub and one on the rear axle center line. Then was able to measure wheelbase of both sides.. Same theory as plum bob. Specs call plus or minus 1/4 inch. I would think if you were this close the rest could be adjusted in suspension. I do agree with Weld, How close where these from the factory? I used seat belt bolt holes, Drain plug holes, anything that is stamped from the factory for a reference.. Measure from rear subframe mounting holes across to radiator support mounting holes. Measure, measure, measure. Then cross your fingers and start welding!
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