This is the article that I refer everyone to
http://www.moparaction.com/tech/archive/disc-main.html Now, if you do not have the 11" discs, this will be a major return on your investment. As far as rear brakes go, I work at the "factory" and have talked to the engineers. On most cars, the rear disc brake option is only because the "other" guy has it, and the consumer wants it. In a hard, or panic stop situation, the rears are at 30% of the stopping power or less. The rear is so unloaded, it barely counts. ABS makes more of a difference than disc or drum in the rear. For an older mopar, I would be just fine with the optional cop or taxi size rear drums. Sorry, I dont remember the drum sizes, but they were also available as an option on almost everything else.