So I have a '58 F100 short box that was lowered (improperly) when I got it, but not running. We got it running and I took it for a test drive and there was an awful screeching coming from under the cab. After inspection I found that my drive shaft was rubbing against the cross member. I had the lowering job redone by flipping the leaf springs under the rear axle. I considered notching the cross member for clearance but thought the weight of the bed would only readjust and continue rubbing. What are my options here?