Rjcinelli

So I figured out why the plug wasn't in right, top connector has different pins in the 4.0 plug compared to the 2.5. I plan to splice the 4.0 harness into the 2.5 plug so I can just plug it into the fuse block. Lower plug is the same between the two. Does anybody have a good diagram of 88 4.0 or 89 2.5? I noticed there is a yellow wire on the 4.0 that does not match up with anything on the 2.5 plug and on the 2.5 plug there is a red wire not going to one on the 4.0 maybe they are both the hot wire and just a different color? Time for some research

Well I figured out the plug was not in all the way, but the bolt is, bolt is now stripped due to me not paying enough attention while trying to remove it. So now I've got a bolt holding the connector in and the plug not in all the way because it pushed right over the bottom lip of the fuse box part. I'm going to try and get a back me out in there to bring the bolt out. Sent from my iPhone using Tapatalk

I've definitely got the right size, it's 1/4" and it's definitely a pain to get the right angle on. I checked for power at all of the fusible links and had power. Power stopped and that wire you're talking about is hooked up as well. Sent from my iPhone using Tapatalk

Alright guys everything for the truck is hooked up, I have power to my starter and alternator. But no lights, dash, nothing, turn key and nothing happens at all. Any ideas where to look? Update: I checked and didn't have power to anything behind the firewall, so I started unbolting the main harness that goes into the fuse box and I think the bolt is stripped now... Anyone have a tip on how I remove it now? Feeling like I may have really messed up now Sent from my iPhone using Tapatalk

Moving along with progress slowly but it's getting there, still a handful of things left to do. Sent from my iPhone using Tapatalk

Knock sensor. Thanks, I was told by a few people that they're not important, my question is why would they not be important? I'll be replacing it. Sent from my iPhone using Tapatalk

Can anybody tell me what this is? I broke it removing the plug to it Sent from my iPhone using Tapatalk

. Of course, the one time I come into a sliding window Anyways I worked in the rain for a while today, got the harness hooked up to the motor, mounted the alternator and power steering, mounted tranny and tcase. Then called it a night because I was soaked and didn't feel like staying out there longer. I checked to see if my driveshaft will fit and unfortunately my tom woods heavy duty driveshaft is too long, I'll have to get it shortened, and my front driveshaft is too short, looks like I'll be ordering from Tom again. Was really hoping they would fit but I knew they wouldn't. Tomorrow I'll probably work on the rest of the dash and interior panels that I want to swap since it's going to rain again. Sent from my iPhone using Tapatalk

Anybody have tips on removing rear window? Trying to take out the sliding glass window so I can put it in my truck. Broke one of the solid panes thinking I had gotten through the seal but I guess not. I did remove the gasket already Sent from my iPhone using Tapatalk

Need to take more pictures so this isn't such a boring build sorry guys that donor fuel filter looks pretty bad to me Sent from my iPhone using Tapatalk

Took both fuel pumps out, put my dash in, and got motor in myself, what a PITA that was doing it with tranny and tcase attached. Now it should go smoothly from here. Picking up a new fuel pump tomorrow or Tuesday, going to rain until Wednesday but hoping it stops a little so I can get some work in. Sent from my iPhone using Tapatalk

Donor harness is installed in my truck, I also replaced the Valve cover gasket and head gasket yesterday and the motor seems to be in excellent shape. My old motor... Not so much. Pulled the head off of that and the piston head is starting to break apart in cylinder 3, and in cylinder 1 and 4. Still need to remove fuel pump from the donor, apparently that won't be too fun, I'm sure by then end of sitting under it I'll be buried under a pile of rust. Better get to working on it and I'll update later on Sent from my iPhone using Tapatalk

I've got no interest from people up in New England wanting anything unfortunately but I am going to be taking the tail lights for myself since I have a cracked driver side one, the passenger one on donor is cracked and I'm hoping to get that rear window into my truck, been wanting a sliding one for a while but I will post up the other parts for sale definitely. Sent from my iPhone using Tapatalk

Weather is so on and off with rain and sun but I got some work done today. Pulled the harness from the donor, and the motor mounts that bolt to the chassis, also got some of the interior pulled, just about done molesting this truck then it'll go to the scrap yard. Pulled the harness out of my truck too, and started swapping over motor mounts. Probably little to no progress this weekend, I'm thinking about going up north for a weekend motorcycle cruise. Sent from my iPhone using Tapatalk

Could anybody explain to me what is considered the underhood harness? Is it all of the wiring that is in the engine bay? Including wires that go into firewall, or just the big main plug that goes into fuse panel, then along drivers fender accross headlight harness to all the plugs on passenger fender? Not sure if I just need to unplug all those and they plug into my harness in my 2.5 there, going to be working on the removing harness's from both vehicles today. Sent from my iPhone using Tapatalk

So I went to do some work on my buddy's fathers truck before I worked on the Comanche and happened to split my finger wide open thanks to a bungee cord a rusty brake rotor. Left and came back in the morning to pull my motor out with my finger taped up, pulled the motor from the donor and then went and got a tetanus shot, now I'm covered for the next ten years! It's pouring out today so no work on the truck. Hoping tomorrow or Wednesday after work the rain will stop and I can get to work on the harness and whatnot. Any tips on removing the sliding glass window? I already broke one of the solid window panes trying to remove it... Sent from my iPhone using Tapatalk

I vote keep it white but then again my favorite car I ever owned was white so I'm biased, I'll keep my eye on this for sure man Sent from my iPhone using Tapatalk

looks like a nice base for a build, love white trucks so I already love it!

Rain coming the rest of this week, probably not going to get anything done until the weekend because of the weather but hoping to get this moving along once I have the engine bay empty to remove harness and all other things. Motor mount bolts are such a PITA a lot of the nuts have welded themselves to the bolts over the years.. Just looking forward to taking it wheeling this summer can't wait! Sent from my iPhone using Tapatalk

Okay guys so I've pulled the motor/tranny/tcase from my Comanche, all that's left on that is to pull the underhood harness and other engine bay parts to clear it out for the 4.0. Got the donor late Friday night around midnight, spent a few hours on it Sunday and disconnected the underhood harness, and almost everything else. Motor will be ready to be pulled once I finish unbolting them. So just about every bolt broke when I was trying to unbolt the tranny cross member, I have bolts from my truck so not a big deal, but the AX15 cross member seems like it has extra support brackets on the upper inside frame rails, I'm assuming I have to use them? They look pretty rusty to me I don't know if they'll be useful, any advice? Also anybody think it's worth it to swap the dash and steering column just to gain a crack free dash and tilt wheel? Or would that require the inside harness being swapped as well because of the delay wipers and any other differences? Here's some pictures of the donor Sent from my iPhone using Tapatalk

Small update, picking up the donor comanche either tomorrow or saturday. My comanche is ready to have the 2.5/tranny/tcase out. I did some research and the interior harness's should be identical because the 4.0 is also a renix motor, so I only have to swap underhood harness and ECU. The donor has a more complete/less filthy interior along with a tilt wheel so I'll end up swapping that in as well. I will post some pictures when i bring the donor home.

Okay, I'll likely stick with my tank as I know it's not all rusty inside, and just swap the 4.0 fuel pump over to it. Also when you say not the whole front end, just rad support, I'm assuming I can just swap the rad support from 4.0 and not have to cut anything? Correct me if I'm wrong, I could be misunderstanding. And I'll check out that post when I get on my computer. Just checked Out the Donor Comanche and it runs well, about as rusty as I expected from a New England truck but that doesn't matter for me anyways. If anyone is interested in parts that I don't use from it, let me know

Wow it's been a while since I was on the forum, got that 2.5 in and had some issues getting it to run... I forgot to connect a wire which caused the motor to turn over but not start. Got it running after I found the wire that wasn't connected. I ended up being convinced by my girlfriend at the time (now ex) to sell the truck. I'm never doing that again. Bought my truck back almost a year later and wheeled it all season. Well the used motor I bought proved to be not so good, it's knocking so I ordered a motor from low mileage parts, not very happy with it for the price I paid so I'm sending that motor back. I found a 1988 Comanchd 4.0 5 speed 4x4 a state away from me for $500 so I'm planning on now swapping my Comanche to 4.0 from the 2.5. I've been researching and I will be swapping just about everything over from the parts Comanche. I have three areas I'm unclear of though. 1. Do I need to cut my front end up to fit the radiator or can I take the front clip from the donor and bolt that in? 2. Since both Comanches are remix do I still have to swap interior harnesses or can I just swap the ECU and be done with it? ( planning on swapping the cluster so I can have real guages), if I do not have to swap interior harnesses will the cluster work just fine with my harness? 3. The fuel issue, can I just mount the 4.0 tank in my truck along with fuel pump and be done? Or is there more to it? Thanks ahead for the advice guys, hoping to be more lively on here this time around. I also have a daily now so this isn't a rush but would like to finish it as quick as possible so I can get back out on the trails

So I picked up a 2.5l MPI motor from a 94? YJ, it's said to have about 72k on it. The guy gave me a bunch of spare parts he had laying around so if anybody needs a good head, pistons, rocker cover, water pump, fan, etc PM me. Pulled my motor last night and started pulling parts off my motor to swap over. I pulled the throttle body, intake manifold, thermostat housing and clutch. Got too late so I had to head home. Going to transfer all of those parts onto the new motor tonight. It looks like my motor has a serpentine belt, I thought that people had said I would have the "V" belt but I don't, not quite sure why but I've got the serpentine belt already so no need to swap the pulleys over. Since my dummy lights never worked to begin with, I am wanting to swap my cluster over to one with gauges. I've been doing some researching and know I need to get a 90 and older cluster to work well. If it's from a 4.0 I will likely have to calibrate the tach. I'll be picking up the senders today or tomorrow and am searching for a cluster, if anybody is selling one PM me. here's a couple pics from this weekends wheeling trip I went copilot with a friend Nobody else in the group has an MJ, so I gotta get her back up and running so I can show them a real rig :P