the factory build process was way off from car to car, quality control wise, and over the [approximate] half century since built, who knows what has happened. even though it may appear bent, it could still be within the factory tolerance. [plus or minus 2"
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just an example. the local GM dealership got a new frame machine for their body shop a few years back. when the machine rep was setting up the machine and teaching the techs how to operate it, they randomly picked one of the higher priced 4WD chevy pickups to use as a vehicle to demonstrate the machine's operations. to their great surprise, it was found to be 5/8" out of square ! at first, it was thought the tech entered the wrong info, but after several attempts to see why this was showing damage, it was found it just so happened it was built this way ! it went down the road good, and was perfectly in specs for a 4 wheel alignment. and that is with precision build robots of today, plus the myriad of quality checks done along the line today, vs the "looks ok to me" checks of 50 years ago. the looks on everyone's faces when this truck was measured was priceless ! of course, i had to interject it was only a chevy, what did you expect ?