Baddad

Does anyone know what the normal operating temperature is for a NP242? Mine is hot to the touch even after a short drive. Just installed a Iron Rock sye hack'n'tap and now have a different vibration. When looking at ujoints I noticed the transfer case and front portion of driveshaft was to hot to touch comfortably. Is this normal? I Used a stock front driveshaft for rear.

ehall

They get really hot

The 242AMG that is used on the military Humvees have a cooler ...

Cheddarnut

Yeah, they run hot. Wouldn't hurt to check the fluid, ATF+4.

Baddad

Just changed fluid, I'll double check the level. Took only about 1.25 quarts to fill which didn't seem right. Would be kinda cool to put a cooler on it, do the Hummers use a remote pump or something?

Cheddarnut

It doesn't hold much, I can't remember but it's less than 2 qts.

ehall

From what I understand, the return line from the transmission cooler goes through a finned tube that is mounted in the transfercase and wicks the heat away. The transfer case fluid never leaves the case.

http://www.ebay.com/itm/HMMWV-HUMVEE...-/150598352292

Other people have done remote pumps. Google returns some interesting stuff

Baddad

Thanks for the info guys! Kinda worrisome when it's that hot and I just don't know what's normal

Cheddarnut

It's definitely one of those things to fill and forget. They are pretty tough and a lot simpler than the transmission or motor. I say let her roll...

SteveMongr

The 242 case temperature operates at 135-145F on my rig. Front driveshaft gets stupid hot due to location.