My Caddy powered Scotsman was down to some detail work when I decided to grab N8 and return the Th400 transmission core to the auto parts store in the truck. When I built the drive shaft I made up a home made U joint adapter for the front yoke with two machined spacers to center the smaller cross in the bigger yoke. On the way back from the store at 70 MPH we hear a bing bang and the truck started shaking like mad. We got it to a stop and found we'd thrown one cap on the U joint. No big deal I thought, this time I have a drive shaft shop do it right. Had the truck towed home and figured I'd limp into the garage but heard a hell of a banging even in park.
By trying to save a few bucks on a drive shaft, the broken joins shaking cracked the case on my rebuilt transmission. Parked the truck in the garage and said screw it for a few days. It's not the loss of the $500 transmission that pisses me off as much as the labor involved in getting the damn transmission in and out again.