42RH / A-500 in a Duster with pictures.
What part of the overdrive don't survive?
Here is a link, and a excerpt from moparts on the subject:
http://board.moparts.org/ubbthreads/showflat.php?Number=6197494
" I have no idea where the guys get the BS saying the Mopar ODs are weak. My a518 has held up behind my Cummins for 273,000 miles. I tweaked the pump for more than 600 rwtq at 150,000 miles. This thing has been drag raced, jumped, off roaded, done donuts, hauled really heavy loads, and pulled cars through more than 20 states.
In short, I beat the crap out of this truck and the transmission has never let me down. I TOW IN OVERDRIVE.
The later trucks lost overdrive because of converter clutch failure. When the clutches fail the debris goes through the transmission. The overdrive compounder collects the trash and fails first. The OD isn't to blame. It's the converter.
Put an a500 in the car and hit the road. It'll do everything you need. "
Looks like the a500 FTW, wish I would have done one now I dumped a bunch into my a904 that has the 2.74 low gear set. Can't justify the 2-3MPG, if that, I'd get in return to do one now. :D