I'm not sure if the D 60s will fit. Also, most Dodges that were 3/4 ton had a D 44 or a D 44 HD (heavy duty) and not the D 60. Can you get pictures as this will allow us to know for sure? The spring perches will likely have to be moved at a minimum. Other considerations: Is the front closed- or open- knuckle?; Does it have disc brakes?; Is the front a pre '94 axle (pre '94 have passenger side drop and '94 and newer have driver side drop and coil springs, IIRC)? Also, will need new front drive shaft and likely a different u-joint but am not sure on that.
If they are D 60 axles w/ open knuckles, disc brakes and passenger drop, I'd go for it. If they are D 60s and they don't work out you can always put them up for sale. This combo is the holy grail for pre '94 Dodge 4x4s.