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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