Search the Community

I bought this MJ for a Cummins project. I have no intention on using the 4BT nor the much heavier 6BT. Rather I own an engine that isn't very well known. But more about the engine later. First about the truck. It is an 1986 Comanche 2.5 with an AX5, D30, and D35. The transmission is shot as is the engine. The front axle has seen better days as well. The interior is red and I really hate red interior so that is going to change to maybe a grey one. It has the bench seat, the headliner has been stripped out, and hardly any of the lights work on the dash. The doors have grey panels with hand cranks for the windows. The bed has dents and some deep scratches in places. Body has broken plastic here and there, I would have to say that the truck as it sits now has seen better days and was begging me (or anyone else that cared about it) to buy it and bring her back to life. So that is what I will do. Now for the engine. The engine is a Cummins 6-AT 3.4 liter turbo diesel. It is about the same size and weight of the AMC 6. Fully dressed it weighs in at about 680 pounds. Now do not let the size fool you. I have this motor in a 4000 pound 4x4 vehicle now. It tows and runs just fine and I have yet to tune it for more power. Now being the engine is about the same size as the AMC 6 or a Chevy 235cid, or a Landcruiser 2F, it should fit within the engine bay with no issues. The oil pan is a rear sump and I am certain it will have no clearance problems. If it is does then I will just modify the oil pan for the application. The engine uses a universal GM bell housing bolt pattern. The Transmission I want to use is still up in the air. I have thought about using either an SM465, NV4500, or even an NV3500. But I am open to ideas. The Transfercase is also not decided. Something that would compliment the transmission as well as allow me to continue to use the factory shifter because well I kinda like the way it works. I will not be keeping the CAD system. That is going bye bye. The Axles.... Might stay with the OEM front axle and eliminate all the CAD crap and lock it into place so I don't have to worry about that system ever giving me issues. Extra stuff just means something else that I have to worry about breaking and/or troubleshooting. If it isn't on the truck, I don't have to worry about it. The D35 is getting dumped for something stronger. I might use an Aussie locker in the rear but also considering an ARB locker. Also would like to have 4 wheel disc brakes.