[Mad Max]

Presuming you're going to use an early 12v 1st gen 6BT, and presuming you want an automatic, I'd recommend either a 518 or a 618 (46RH or 47RH) diesel 4x4 tranny. Either a 205 or a 241 t-case bolt right up. You cannot use a gasser tranny behind a diesel. You will only really need a good aftermarket converter if you plan to tow heavy.

 

[Mad Max]

no 'g' - just Cummins .

The 727 is a very stout tranny - same as the gasser version.  The non-intercooled auto trucks (89-91) all had 727s - no overdrive.  About as bulletproof as it gets.  But it also required 3.07 axles to make up for the overdrive.  IIRC the 5-speed trucks had 3.54s.

I had a 90 Ramcharger, with a non-IC Cummins, a 727, and 3.07s.  It was my daily driver, and it was a fantastic running truck.

 

[Mad Max]

Nope - well other than the hubs for the duallys, and the dually's are about 2 inches wider (generally). Other than they they're basically the same. And, you can put the 1/2" (3/4-ton SRW) studs in the dually hubs and thus convert the dually hub to accept a SRW wheel

 

[Mad Max]

Unfortunately, I'm 99% certain the hubs are not interchangeable You need the wider axle so the inner dually wheel, when flipped in, won't rub the leaf spring.

 

[Mad Max]

the only real difference between the 2nd gen 47rh (A61 and the 1st gen 46rh (A51 is the 618 has a lockup converter, hence the thicker engine adaptor housing. The 618 is a bit difficult to find, and the 518 is easier. Unless you 'need' a lockup converter there would be nothing wrong with using a 518. LOTS of folks think all 518's are the same, but the fact is most for sale on craisglist etc just advertise a 518 for a 93 Dodge Ram...but it's usually for a gasser. Every diesel converter has a 6-bolt flexplate and converter. The gassers are 4-bolt.

 

[Mad Max]

no, the gasser and diesel tranny's are 'similar', but the diesel version has a different bellhousing (that requires the engine adaptor), uses a 6-bolt converter, and has stronger guts/more clutches.  They essentially operate the same, but the two are not interchangable.

 

[Mad Max]

Ok this leads me to a question. 94-95 used driver side drop xfer cases. Take a 92 ctd 518/np205. Will that 92 xfer case bolt to the 47rh that used a drvr side drop?

well, I know the NP241 t-case from a 93 RC will bolt up clean to the back of a 95 diesel 47rh, 'cause that's what I have in my RC