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I recently had a fluctuating voltmeter, at times pegging the meter, at other times stuck in the yellow range. I eventually replaced the voltage regulator, but not until the low voltage situation ruined my new and expensive ESS box. But now, my voltmeter will not get out of the yellow range. I...

I've been having some nagging problems with Gunny (my '90 M998). Voltage gauge has been inconsistent and erratic, usually charging, but at times over- or under-charging. So upon inspection, I observed a crack in the VR potting material. I put off swapping the voltage regulator until my...

Hoping to tap into a specific set of experiences, here. I'm a couple of years into a transmission swap, now running a 4L80e, using a Quick4 controller. When the tranny was installed, I used the transmission output speed sensor, instead of the T-case. It didn't give me accurate speedo...

Recent troubles with my 1990 M998-A0 (6.5NA) that I would appreciate advice on. This summer, it ran fine here in the Texas heat. From the time I brought it home in March 2015, it had always started almost instantly. However, late this summer the crank to start time started going from near...

Feeling pretty stupid today, but I'll swallow my pride and beg for help! Enlisted a friend's help to jump my M998A0, and he got the cables switched for a short time. No telling what damage was done, but I know for sure I am not getting power to the IP. Glow plug light cycles, starter works...

Performing a minor rebuild of my fan clutch with new seals, friction lining, etc. Wondering how the needle bearings are lubricated and what, if any, petroleum products should be used when I put it back together. Any suggestions? Thx, Jon

Ok, my apologies if this is a completely repetitive ask, as I see tons of Fan Clutch posts and don't really want to sift through the mountain of info to get the nugget I'm looking for. Looking for an affordable source for friction lining, seals and O-rings to rebuild my fan clutch. Best I've...

I recently purchased an old 24' military trailer, the type you would expect to see rolled into a missile test range - windows all around with slide-up covers, 5th wheel for hauling with a semi. Interestingly, the 4+1 tires are in remarkable shape, free of dry rot, cracking, etc. So, I'm...

1990 M998 A0, 6.5, 60a Alt Drove to the farm, nothing unusual, all gauges dialed in as they should. On the way back, the volt meter, which is always in the green zone, dropped down about 1/4 of the way into the yellow zone once up to op temp. Got home, cooled down for 15 min, restarted and...

Hoping to retrieve the approximately 15hp sucked away by the factory fan, I installed the Flex-a-Lite 430 Pusher Fan, and I am unimpressed. Actually, pretty ticked off at myself. A preliminary search for the CFM rating of the OEM fan yielded nothing, so I figured the article from Four Wheeler...

I know this information has to be on here, but even the advanced searches turn up so many threads, it's tough to get to the one little nugget I need! Swapping a 4L80e into my '90 M998 and now in the process of staging the parts, with one remaining. My 4L80e has been rebuilt, mated to a NP241C...

I'm pretty sure the answer to my question is on SS somewhere, but I can't find it. Looking for the turn signal cancelling ring for my '90 M998. My search so far produces bupkis. Any leads on a source? Thx, Jon

Here's my situation: New HMMWV owner with more than one trailer wired for std 12V. Same trailers are used routinely behind my F150 and other vehicles (of friends who borrow them). I'm trying to build a solution that does not involve swapping bulbs on the trailer, so here's what I think might...

Does anyone have a source for a roll bar for an M998 cargo area? I've got a 4-man config and would like to add the roll bar/cage that slants back to carry a spare and for general safety. Hopefully this has been done before. Thx, Jon

Just bought an M998 A0. The 6.2 has been replaced with the 6.5, but the 3-speed tranny and NP218 T-case remained. Although I do respect the original config of only 4WD, I really would like to swap the TC for one with a 2WD option in addition to 4H, 4L and 4HL. Long term plan is to drop in a...