Np231 speedometer question

[ricekrispyota]

I currently have an NP231 DHD in my truck. I also have an NP231D that came with the speedo hole on the housing. I'm looking to swap the rear axle (not to the one I asked about a couple weeks ago), but the possible transplant axle does not have a speedo hole/plug where the current speedo plug is. My question is, can I get a SYE kit with the speedo hole in the tail housing and use that to determine speed or do I need a rear axle with the speedo hole on it? Is it as simple as splicing the wires to correct speedo?
This is what I currently have:

This is what I'm asking if I can do to make the speedometer work?

Thank you.

 

[NorcalDakota]

You can use the speedo on the 231.

I am running a dana 300, speed sensor from a XJ, and then use a Dakota Digital SGI-5 to communicate with the PCM.

 

[total newb]

The 231 "dhd" (ive never heard of that) and the sye kit you pictured have clearly different bolt patterns.

 

[u2slow]

Most of the 89-95ish dodge products have a mechanical to electric transducer in the tcase. Should fit the hole in that sye housing.

 

[ricekrispyota]

The 231 "dhd" (ive never heard of that) and the sye kit you pictured have clearly different bolt patterns.

NP231D (dodge) HD (Heavy duty) came with the wider chain and I believe most have the 6 gear planetary. I have an NP231D that has the same bolt pattern as is shown in the first pic. Good eye, though.

 

[pinchegringo]

The D transfer case speedo has a gear that has to be matched to the tire size. I have a gear speedo case with a magnetic pickup screwed where the cable goes from the factory.. They did all kinds of funky stuff.There's several different styles and a year break around 95 or so. They also installed 3 4 5 and 6 pinion planetaries in different cases over the years. They also have a break around 95 with different pitched gears.

 

[u2slow]

The D transfer case speedo has a gear that has to be matched to the tire size.

Most of mine have an external gear ratio adapter. I presume that is so they could consistently put the same gears in the the tail housing.