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Greg, you may have to transfer everything from donor truck to make the swap work tranny , computers, wire harness, fuse/relay center etc. Check the attached links,forum for Dakota engine swaps,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." engine swap 4 7 to 5 2 or 5 9 Dodge Dakota Forum Custom Dakota Truck Forums
The standard gear ratio for a '91 Dakota with the 318 V-8 was the 3.55 ring and pinon. The 3.90 or the 3.21, or the 2.76 could be ordered as an option. However the most of the Dakotas, either the V-6 or the V-8 were ordered with the 3.55 non-locking rear axles. Also your truck may have had either the 7.25" rear end, having a differential cover that is shaped ( 8 sides) like a "stop sign". Most likely will have the 8.25" rear end, having a "more rounded" differential cover. With your truck being a 318 V-8 the 8.25" rear end was more common. Hope that helps.
Don Fitzpatrick. Washington, Ok.
Oklahoma Trailchasers 4X4 Club.
You may have a bad engine ground to the frame. Check & clean any ground wire connections. Also there may be a ballast resistor mounted on the firewall &/Or the starter that has cracked. This will only allow the truck to start in dry conditions. Make sure your red starter cable is not frayed & in good condition & clean the connections at the battery & starter. Hope this helps. Good luck!
Distributor: ............3 ....4..............6... .......................(+)-screw: rounded-end of Cap 8......................5 (+)-screw: square end of Cap .....1...............7 ..............2 .........(front)
Let me know if this helped, or if you have additional information questions. Feel Free to contact me at FixYa.com!