No joke here, especially with an auto. Ive only got Baby Swamps in mine, and i very rarely ever beat on it, but i still broke the hell out of my E4OD towing. The replacement trans is wayyy beefier.-You will HAVE to get some transmission work done. I couldn't even drive the truck in anything other than "heavy tow" mode with the goodies in the truck before I put the south bend in. Clutch slipped constantly.
Since we're on the subject, who here is running water/meth on their 7.3? Been thinking about getting the Snow kit for mine ('96), but im always looking for other opinions & ideas.