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by 97 you mean build date 97, but its 98 spec with the new dash with passenger airbag? If it is 98 spec can you find some part numbers for the ecm, and the part number for the main harness in the engine compartment, the one with the fuse block, that would be really helpful.

Perhaps this should go in the 24v powertrain section, however I figure I will just piss people off over there Introduction I am in the process of swapping a 12v into a 1998.5 24v 5 speed. This should be an extremely easy process but I have had trouble finding the details on how to go about this swap. The info I post here should be at least 100% compatible with 98.5-2000 manual transmission trucks. If I make a mistake, have tips, or you would like to add something, let me know. 2 philosophies There are 2 trains of thought, the first is to fool your truck into thinking it still has the 24v in it. This is done by transferring sensors over to the 12v, this seems to be the most common, especially among p-pumpers. The benefit is cost, but the downside is you can't fool everything, you will still have your check engine light on, and I believe you will still have sensors that are known for failing like the throttle position sensor(apps). The other method is to use early 98 PCM and wiring harnesses, which is what I am in the process of attempting. Benefits being it will be a 100% factory install. Everything will work just like an early 98 pickup. Details You must use early model year 98 pcm and harnesses, 97 is different and will not be the same, I do not believe the 97 will be able to communicate with the 98 and later instrument clusters. Manual trans vs auto and federal vs California effect component compatibility. (2wd / 4wd) (2500/3500) (reg cab vs extended) shouldn't matter. PCM Part number info ALL MODELS; 5.9L DIESEL; MANUAL TRANS; FEDERAL; 12 VALVE Part #R6040139AC (newest#)replaces: 56040139AB, 56040139AC Going price for used pcm is$300-350 Engine Wiring harness info Manual trans Part# P56045095AA used price $150-300 Headlight to dash harness (Official chrysler name) Basically this harness includes the fuse box, which the engine harness plugs into. I am least sure on this part# but manual trans should be 56020499AD used price $250-375

Alright that matches what I have gathered as well. I just picked up a 12v tonight, so I am now committed. I will probably do a write up when I get the bugs ironed out.

I have a 98.5 24v cummins 5speed, It has a cracked block and a bad lift pump, probably bad IP, so I would like to do a 12v swap. To have a fully functioning truck, cruise, check engine light, stock gauges, etc what are my options? 1. I have read that I need a 98 pcm, but wouldn't there be more then one part number for 98 pcms? I could see there being different ones for: (auto/manual), (cruise/no cruise), (California, non cali emissions) (air conditioning/ or no a/c). Is there a part number list? Am I wrong is it much simpler? 2. What about a 97 pcm, would it not communicate with the other computers and instrument cluster? 3. Which harnesses do I need? I read I need firewall forward which is 2 separate harnesses? One is an engine harness, and the other is what the fuse box? Can I use 97 harnesses or does it have to be 98? 4. I shouldn't have to change the instrument cluster or any in cab harnesses correct? Any help would be great because getting a complete donor vehicle is very unlikely and I will have to piece it together probably sight unseen via ebay. I would hate to by parts that aren't compatible.