42RH / A-500 in a Duster with pictures.

Just an FYI for those considering this, here is a rough breakdown of what it cost me.

$150 transmission core
$230 Mopar Performance converter
$24 Shift kit
$195 Driveshaft shorten and balance
$123 Trans rebuild kit
$40 Five clutch front drum
$15 New aluminum accumulator
$40 4.2 ratio kickdown lever
$29 Longer speedo cable
$6 Trans mount
---------
$852

If you were on a budget, you could go with the original converter or even a reman (the Mopar ones are pretty tough and the one I got was mint) and you certainly don't have to go with a better kickdown lever or find some parts like the speedo cable cheaper.

Yes I did all the work myself and have a welder too, the cross-member was made from scrap collected over the years from projects gone by but would not be that expensive either.

Overdrive is da'bomb! For all the headaches, I would not go back.