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Old 04-04-2012, 09:27 AM   #1 (permalink)
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School me on a Hummvee Transfer Case

Some Questions on a 1993(I think) Military H1 that my dad has.

It is driven almost every day around the dairy by my brothers.

Last Saturday one of my brothers drove it about 10 miles to my house. He when wheelin in the river near us. After a little bit he says the t-case started making a bad noise. He left the river but couldn't take it out of 4lo, so left it by me. On Monday he and my dad came over to work on it, they pulled the plug to check the fluid, and only a little bit came out. We've had the Hummvee for about 10 years, and for all I know, no one ever checked it. Yeah, bad.

Ok. Questions. How bad is it? I know it is an NP 218. We are working on taking it out and apart. I look at the linkage and lines coming out, and there are lines going to and from the case to the trans and to the trans cooler. The trans fluid is good. How does this all work with the lines going back and forth? I imagine the fluid comes from the Cooler to the trans then to the t-case then back to the cooler. Can anyone tell me why the trans is good but the t-case isn't? Can anyone point me in the right direction as we start on this? I don't think we have a manual but one would sure help.

Any help would be greatly appreciated. Sorry for the long post.
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Old 04-15-2012, 10:14 PM   #2 (permalink)
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The lines you see for the transfer case are for the cooler thats inside.It uses the trasn fluid.Most likely your transfer case will need to rebuild.If your lucky you haven't spun a bearing and took out the case.

Last edited by lutz; 04-15-2012 at 10:15 PM.
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Old 04-20-2012, 11:36 AM   #3 (permalink)
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if it hasn't sent metal though the system you should be fine with a rebuild, just make sure you clean the cooler and the lines out...
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Old 04-20-2012, 09:06 PM   #4 (permalink)
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Cheap and easy to fix or replace (and pull).

http://hummer-hmmwv.tpub.com/TM-9-23...-24P-1_390.htm

Blow out cooling lines, and change transmission filter and fluid.
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