Got the unit torn down (1985 build A999) and found both planetarys in not so great condition, fair amount of side-side and rocking play. Given the mileage and hauling around a huge van I'm not really surpised. Got a line on a new front unit for a decent price, rear one I am not having as much luck locating or finding out if the newer part numbers will interchange/superceed the older ones. Original part number for 85 being 3681988.

I know chrysler changed the sprag and drum for 1988 but will the newer unit fit the older drum ? Cant think of why they would go through all the trouble of changing that but chrysler has been known to do dumber things before.

Thank you.