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You can have bent axle tubes and all the bearings + gears will be fine. ( I've raced dirt cars for years-done it plenty of times.)
If the rear axle was just ****ed eyed in the frame-then it would just dogtrack.
2 things you can do easily:
Check the "toe" of the rear. Take 2 straight pieces of sq. tubing or angle iron apx 2ft longer than the diameter of the tire. Set the bars with 1ft past each side of the wheel with the bar setting on top of a couple of beer cans. (or whatever you have so the bars on both sides of the truck will be even. Hold the bars tight to the tires and use 2 tape measures an equal distance from the tire-it the distance is any more than 1/8" off from front to back of the tire-you got problems.
String the truck. Take a long piece of string and tie off one end to something behind the rear tire. (the shock would work) run the string from the back wheels toward the front across the wheel centerline. Line the string up so it touches the sidewall on the rear of the back tire and front sidewall of the front tire. See if the string touches the front of the rear tire. Do both sides--if it misses the front of the left-and back of the right, (or the other way) you rear is crooked in the frame.
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