I've done lots of OD trans and worked closely with Transgo on the development of the OD reprogramming kits
very doable
https://www.hemmings.com/magazine/mus/2006/07/Chrysler-A-518-Overdrive-Transmission/1301453.html
http://www.hotrod.com/articles/43323-mopar-overdrive-transmission-swap/
find a 92-94 (95) magnum v8 OD 518/ 46RH or you could get same years 904 style A-500 but why? or some earlier trans- see list in the article
The v8 trans is more durable
those years were 3 wire- mechanical not electronic OD 8 wire and lock up spedo is mechanical
you can stick the guts from a later trans 947 rh) in the case if you want to
early trans has let's say 30 degree angle on the OD PLanataries gears- be sure to have plenty of coolant flow later are 15- easier on the thrust washers
early has straight cut diesel gears available- which I have- so NO thrust washer load- I have over 200k on mine
you can use Diesel number of clutch units with either the V8 or 6 cyl trans- they are the same
904 you can use 5 clutches in front out of 998- use all the 998-999 front parts
518 you can use the 4 planetary 440 front end or the guts from a 1994–2003
A618 (47RH/47RE) — 4-speed heavy-duty automatic- just make it hyd not electronic
if you are rebuilding the trans drill the case and tap for one size larger flare fittings and use half inch oil proof hose to a big cooler
There is a later oil pump that pumps more oil and the converters have flats instead of the notches on the nose
drop a note back
