'71 Dart rear leaf springs ?s

Here is what I have found on mopars. Look under the car at the hole in the bottom of the frame rail just in front of the bracket that the spring bolts to. You will see a difference from side to side. Usually one mount is welded in place forward than the other. This is common and why many mopars when doing a line lock tend to turn the rear of the car.

Did you ever watch a burnout contest and they need to hold the car straight. this is why. 340 4spd car bodies usually don't have this problem when they have factory torque boxes. What you will need to do is take a piece of aluminum or steel plate the thickness needed drill the 4 holes and shim the one front leaf spring hanger back.

We do this on many cars to get them to launch straight before moving the leafs in on cars. Once you weld the the new leaf boxes in they have to be straight.

It is very hard to find bodies that are built correctly where the leafs are fastened. You may have to install longer studs on the front hanger . We have seen them off at least 1/2 inch at times

Measure between the arrows on each side as pictured below. See if they are the same. This will give you an idea which side is back