I've got a 97 F 250 lightduty with rear drum brakes that continually over adjust themselves, and cause the brakes to drag. Anyone else experience this, or know what to do about it?

 

I haven't seen any TSB for Ford trucks doing this, but I know Toyotas do. They have a TSB to replace the rear drum star adjuster from something like 32 points to 27, so that is wouldn't keep over adjusting. Try finding something like that for your truck.