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The Onion - 1989 Long Bed, 2.5 TBI


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Here’s the start of the blog that I’ll be using to track everything that happens to this little truck. I picked it up in Fort Collins, CO on January 24, 2026. It was not running and the PO told me it was likely the fuel pump. Loaded it up, headed back towards home. About an hour away from home the snow picked up, making for a sketchy drive, but made it safely. 
 

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1 hour ago, 89 MJ said:

Looks like a very straight and solid truck. What are the long term plans with it?

Well for now, leave it stock and use it to haul my dirt bikes around. I’ve already LS swapped my Cherokee and not sure I wanna go down that road with this one or not. A TDI swap has crossed my mind, I like the idea of having the excellent fuel economy. May just end up putting a 4.0 in. Who knows, that’s a ways down the road. 
 

Highly likely to at least get it to be 4WD. I can’t even get it up my driveway when it snows with its current 2WD state :laugh2:.

 

Eventually would love to get the paint redone. I love the retro look. 

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I was having some electrical gremlins inside the cab and went searching. Found a leaking clutch master and very corroded fuse panel. Replaced the clutch master to solve the leak. 
 

For the fuse panel, I pulled a replacement from an 88 Cherokee from the junkyard. I ordered a bunch of bus bars and single connectors from connectorkits.com and went to work refreshing every single wire. I found a broken wire going into the dome fuse and repaired that while I was there. 

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I also had the C100 connector apart, thoroughly cleaned out all the black tar stuff and replaced the firewall gasket with one from Casper Electronics here in CO. 

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These repairs fixed my brake light and turn signal issues, as well as my dash lights. The headlight switch still needs replaced as it has to be turned all the way counter clockwise for the dash lights to work. My interior courtesy lights are still not working, and neither is the radio. So I’ve still got more work to do. 
 

 

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When I purchased this truck it was a non-runner. The previous owner had claimed that fuel pressure before the filter was 3-4psi. So as soon as I got it home I pulled the pump and found this disaster.

 

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Replaced the pump with a Delphi FE0054 from Amazon which came with the hose, O-rings, and new wires as well. Installed it and the truck fired right up! 
 

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  • 2 weeks later...

Mitigated some fire hazards this week with the battery cables. Since I plan to keep this truck stock, I just went with 4AWG welding cable. Added in a mega fuse off the alternator cable. 

Before:

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After:

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If anyone cares to see my other rig, the LS XJ, here it is. It’s a 2001 with an LQ4 6.0, 4L80 trans, NP241C t-case, ford 8.8 rear factory LSD, Dana 30 front with spartan helical LSD & WJ knuckle swap with Stinky Fab Aluminum steering, 4.10 gears, ~5.5” lift, frame stiffeners, icon rebound pro beadlocks, 35” BFG KO2s.

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3 hours ago, Doc Payne said:

If anyone cares to see my other rig, the LS XJ, here it is. It’s a 2001 with an LQ4 6.0, 4L80 trans, NP241C t-case, ford 8.8 rear factory LSD, Dana 30 front with spartan helical LSD & WJ knuckle swap with Stinky Fab Aluminum steering, 4.10 gears, ~5.5” lift, frame stiffeners, icon rebound pro beadlocks, 35” BFG KO2s.

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Heck yeah!… I know your rig! You just had it at my buddy Ian’s shop where I got to see it first hand. Very nice!

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On 3/14/2026 at 8:21 PM, neohic said:


Heck yeah!… I know your rig! You just had it at my buddy Ian’s shop where I got to see it first hand. Very nice!

Oh no way! That’s awesome. Yeah Ian is a cool dude and did a killer job with the bumper. Need to get it back into him once I get the rear stiffeners done so we can add a couple more supports. 

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This week’s Comanche update: clutch pedal went flat coming off the interstate on the way to work. Clutch master is empty so I’m guessing the slave cylinder gave up. The master is new and lines are dry going to the bell housing. 
 

I’ve ordered a new LUK clutch kit and slave cylinder. I’ll have a local shop resurface the flywheel.  

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  • 1 month later...
On 3/22/2026 at 1:07 PM, Eagle_SX4 said:

I have had bad luck with new master cylinders. Check to make sure there is no brake fluid on the fuse block and in the footwell.

Yep, already went through this and rewired the entire fuse panel. So I’m keeping a very close eye on it. 

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On 3/22/2026 at 3:13 PM, eaglescout526 said:

The internal slave on the 87-90 2.5Ls is what prompted me to hunt down an 84-86 external slave set up so I don’t have to keep messing with shoddy quality internal slaves. 

I may end up trying to do this as well. 

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Clutch job has been complete for a few weeks, forgot to post an update. The flywheel was definitely due for a resurface. A local trans shop got that looking good as new. 
 

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Since getting the slave replaced, I noticed some fine black debris suspended in my clutch fluid in the master cylinder. I’m also getting some intermittent loss of clutch pedal action range. Those two things together make me think the rubber portion of the fluid line going from the master to the slave may be failing. I’m going to get a new one on order. 
 

While the exhaust was apart I took some time to replace the muffler and some straight sections that were falling apart, sounds much more quiet now!

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And most recently, the radiator has sprung a leak where the plastic tank is clamped on at the passenger side. So I’ll be replacing that soon too. 

 

 

 

 

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1 hour ago, Doc Payne said:

Yep, already went through this and rewired the entire fuse panel. So I’m keeping a very close eye on it. 

I added a cover for my fuse box so that when the master drips it diverts the fluid around it.

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2 hours ago, Doc Payne said:

I’m also getting some intermittent loss of clutch pedal action range.

Mostly why I did the external. Shoddy internal slaves are just the worst. 
 

Also I should’ve gone with a factory muffler but I do absolutely love the sound of the muffler I have and how it gives it a nice little aggressive growl. 

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1 hour ago, Eagle_SX4 said:

I added a cover for my fuse box so that when the master drips it diverts the fluid around it.

Do you have a link or picture of this cover? I’d love to do the same. Rewiring that whole panel was not fun and I’d rather not ever do it again. 

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22 minutes ago, Doc Payne said:


How does one go about making that conversion?

You need an 84-86 with the set up. All the parts should swap over to your bell house and you’ll need the pivot ball for the clutch fork. I learned that you can press the 86 one out of the house or you can get the mopar threaded pivot and use that. It’s a loose fit but it stays just fine. 

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