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If anyone in the N TX area needs an OEM TH400 from an M998, I've got one. Also have an NP242 that I replaced with an NP241C. Tell your friends!

I've seen several who've used that. It's Plan C for now. Thx.

Yeah, that sounds about right. The 4wd 4L80e's have no tone ring, making this a challenge. The oil-pump driven transducer is readily available, which can be the feed to your TCM. For now, that's the only tach I'll get - the TCM. My "new" tach won't work without the Autometer adapter for...

Update: Quick 4 TCM is awesome. Finally set the axle ratio correctly at 4.9152 (2.56 axle x 1.92 hub reduction), and set the shift points at RPM's that were reasonable. Such a satisfying thing to feel the shift in all gears. With the T-Case in 2Hi, I actually can feel a difference...

The Quick 4 can take your TOSS signal, using drive axle ratios, and provide its own signal. Again, totally adjustable, so you don't need the on board sensor I use.

Quick 4 with harness was around $750. VDO speedo was $75 - you'll need one, because you'll likely lose the speedo drive cable. Don't fight it - much better and more reliable with eSpeedo. TPS was $50 roughly, can't remember. Other minor things, but those are the drivers.

The Quick 4 takes the input signal from the sensor on the back of the block and outputs a signal to my tach. The ratio is adjustable in the Quick 4 data table (easy to modify), so you can synchronize with your GPS until you get it right. Infinitely adjustable.

For those waffling between 700r4 and 4L80e, I personally recommend the 4L80e. It's a stronger unit, and the only add-on sensor needed is a TPS, which mounts easily where the kick-down switch is mounted. The laptop tuning option is very cool and empowering, in my opinion. If I can adjust to...

Update on this, for those interested. Unfortunately, due to a busy work travel schedule, and the shop being closed on weekends, Gunny still waits on me to wrap up the TCM. But some progress, mostly in my head. The shop told me after they did the mechanical install that they couldn't get it to...

After endless waffling between the 700r4 and 4L80e, I ended up finding good deals on both, so I bought them. The decision on which tranny to use hinged on the degree of difficulty in the setup required for the 4L80e, since it was clearly the toughest one. US Shift/Baumann Electronics produces...

patracy, I've thought the same. Despite a few opinions here that don't actually encourage the 700r4, I'm gonna do the same thing TedG did. I'm not a hardcore offroader, just love to have a little fun and drive mine to my farm. As stupid as it sounds, I despise going 50 mph. I don't need...

Augi, Your prior post reads: "If you put in a 242 you can change one of the shift forks for a civilian one and it will allow the extra position 2wd hi." As it turns out, I have the 242 after all. Can you provide some direction on the shift fork mod required to access the 2H position? Will it...

Dilvoy, Great observation on disconnecting the shafts and the impact on braking. Still getting my head around that concept! I really like the idea of the rotating shafts not causing the diff to rotate. If this hoilds true, then the pursuit of a 2WD option on the t-case will actually provide...

I read the article on swapping the tranny - very thorough and a great read. Once I do put in the OD, I will not be using an ECM, opting for simplicity, thus the 700-R4 or a Dodge 47RH. His final thoughts sort of tell the story I have in my head - that once it kicks in OD, it was all worth it...

All valid points. Too bad someone doesn't make a lockout mechanism for those hubs. If it weren't too much trouble, I'd disconnect the front half shafts along with the OD and 242 T-Case. But you're right, I'd be doing a LOT of work that pretty much defeats the purpose of having a HMMWV anyway...

Thanks, Augi. I realize the absence of lockout hubs, but the resistance back from the wheels through a non-engaged front axle consumes less energy than it takes to propel those same wheels. However, I also realize at this point I'm basing this on the math, and fully expect to have a different...

It is a 1990, S/N 101192. Plans involve nothing really heavy, no off road competitions, if that's what you're asking. Hunting, farm use, etc. If I recall, the 218 has a low range of greater than 2, correct? 2:1 is actually fine, considering the geared hub config and the 2.56 diff gearing, so...

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...