[J10Mike]

Believe me, the questions don't end. Just when I think I've got it all, I find I have more questions. Don't worry about the questions.

Yes, the first gen 89 thru 93 uses different transmission adapter plates as well as starters than the second gens. So, make sure you take that starter with the engine if it already hasn't been pulled. As for flexplates, I had both first and second gen flexplates side by side. I didn't see a difference between them with the naked eye. But, I didn't count the teeth either. Anyway, since I had the first gen adapter plate and starter, I used the first gen flexplate.

As for transfer cases, all 80 and later Dodge transfer cases use the standard NP bolt pattern. You can use a 205, 208, or 241. The 89 thru 93 used the 205. 94 thru ? used the 241dhd. Although, I believe the 205 from behind the getrag 5 speed use the 29 spline shaft.

 

[J10Mike]

The 727 with 4.10 gearing would work as long as you stayed off the interstate highways. Your maximum speed would be like 55 MPH at high RPMs. I already went thru that config. That's why I went with the 46rh with overdrive.

Also, keep in mind that the 89 thru 91 with auto trans also had the D61 front axle and D71 rear axle. Both are heavy duty axles, but, came with 307/308 gearing to make up for the lack of overdrive.

91.5 thru 93 with the 46rh auto trans with overdrive had the D60 front axle and D70 rear axle.
However, the 89 thru 93 with manual getrag 5 speed all had both the D60 front axle and the D70 rear axle.

Hope that wasn't too confusing. Dodge created that, not me. The point is... you should be looking for a donor rig with the D60/D70 combo...

 

[J10Mike]

46rh is missing. Goes between 727 and 47rh in your list. Furthermore, it would probably help if we knew what vehicle you intend to do a Cummins conversion in.

The CTD transmission bolt pattern to the adapter plate is different from the gasser tranny bolt patterns. The exception is the Dodge 94 and later transmissions for the V10. They share the same bolt pattern as the CTD starting with the 47rh auto or nv4500 manual bell housing. Just make sure that if you buy a 1st gen adapter plate, you must use the 1st gen starter. 2nd gen the same.

In my case, I wanted an automatic and overdrive and did not want RE or electronic. My two choices were the 46rh or 47rh. So, I went with the 46rh because I found it first and in need of a rebuild. The 47rh adds a lockup converter if you want that.