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Thanks Mullaney. I put Seafoam in the crankcase too, and will drain the oil about halfway through the tank after it has more time to clean up the innards. Then I'll do my usual drain and fill with a ZDDP additive and see how she fares. I am half thinking I'll flush and fill the transmission...

Ten points go to Mullaney, for suggesting Seafoam. It made an immediate difference. Truck has power back and the surging is greatly reduced. As I burn through the fresh tank of treated fuel I expect it to further improve. Still tweaking the trans link, been raining every day lately, but I'm...

@Mullaney, do you mean into the fuel? I am burning old fuel. I alternate between some stuff I got off a guy downsizing and pump diesel. The old diesel was carefully stored, and has no critters or water in it. I have a good filter setup on my transfer pump (luxury! came with the fuel purchase)...

Spent a hour and a half going under and out from under the HMMWV yesterday, realigning the shift levers. One was bent, made it too long. I'll write it up in the "What have you done" thread to reach more folks as info on aligning the shift levers. Still surging though. I am of the opinion...

You were right Action. It was over a quart low. It still surges though. My next theory is that the two control arms on the side of the tranny do not look completely parallel. This fits with the sometimes not in neutral until I fiddle with the shifter condition I see randomly. I’ll check the...

I’ll double check. Good point.

Thanks for this info and ideas springer1981 The fluid was about three cups overfilled. I drained and added back until the level was spot on. Haven’t driven it to test yet. I will read the EZ manual next and see about swapping the sensors as you suggest. This has only happened twice. Both times...

Thanks for the info Action. My truck does not have the second switch, as you imply, since it is not a factory install or reset power train. I will gather some details on the EZ TCU and see what I can figure out. It is mounted next to my washer fluid reservoir. Not the driest place on the truck...

I haven't been able to find a thread with a similar issue, so am posting my own: my HMMWV 6.5L TD and 4L80 surges when at idle but in Drive, but only when it is well warmed up. Cold the motor/trans holds idle fine when the transmission is in Drive. When the motor/trans warm up, and I come to a...