hello all,
i am new to the site as a member but use it all the time. i get great info just by reading others' posts. that being said i have a 94 dakota 4x4 3.9 and for a motor and tranny swap a 94 ram (5.9 4x4)
1. Can i use the wiring harness from the ram (just plug and go)
2. Will i have to cut the driveshaft? - as far as i know i think i have the 42rh and he probably has the 46rh ( i heard they were the same lengths
and help would be greatly appreciated thankss - waggin

 

*** also the ram (donor truck) came with 42rh 46rh and 47rh that year- just incase that may serve a problem with length. and my dakota does have the 42rh - just verified the vin # with the dealer if any of that helps

 

Wiring will be close, you should be able to just add in the 2 injector wires you need and the transmission temp. sensor, that should be all. Use the 5.9 computer.

The engine will drop right in transmission too. I'm not to sure on the driveshaft though. There are a few 3.9 to 5.2 swap write ups in the FAQ2 in this section, just a few posts above this one.

 

thanks CrazyRT, i am not so much worried about the wiring I've been reading a lot on that. The only thing i cant find out is the different lengths in the transmissions, and if this truck has a posi rear end I'd like to use it but idk if would be too big. i will keep looking though I think i'v read almost everything i can find on the tranny question.

 

Ok so I found a guy near me who I heard knows his **** when it comes to driveshafts and only wants 75 buck to cut and balance. yippie! other than that the deal is done, getting my boss's bobcat trailer and getting my donor. ill let you all know when the **** hits the fan and i need your advice again. lol If nothing bad happens ik im doing something wrong. keep ya posted - waggin

 

The 46rh and 47rh are about 1/2" longer than the 42rh.

 

keep us posted on how it goes man!

 

Hey fellas, i started this morning and finally got the drivetrain pulled in one piece(by the way this 360 made my pants a little damp when i started it). but now that im looking at it i think im gonna be sick lol. the wiring looks like it will serve some problems the 3 main ports dont seem the same (and i hattteee wiring). but anyway do you think my radiator will do the trick or should i upgrade? and im looking for a wiring diagram if anyone could help me there. thanks - waggin

ps. everythings going pretty smooth no major problems, im bound for a big one soon tho lol any help would be appreciated and I'll keep ya posted

 

i was just thinking, could i use the existing wiring harness from my v6? if i could that would be a hell of a lot less cutting and splicing

 

Yes you can use most of your V6 wiring and use most of the sensors. Just add the 2 injector wires like I stated in the first post. The FAQ in this section, just a few posts above this one has the service manual with all the wiring diagrams you can handle.