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Yes, an idea: Check relay 52 on the PDP power distribution panel. It should be a 12 volt 5 pin relay. If a 4 pin relay is present then the CTIS will work but the lights won't light. Bob

Beg to differ, or I am totally misunderstanding your comment. The non-pressurized hub void space on the front axle (where the gear reduction is) has a hose that loops across the pressurized section to the unpressurized axle. Thats how that hub non-pressurized void space is vented. Then the...

On my 1994 M1078 the vent for the outer ends of the steering axles have hoses that bridge over to the axle housing, inboard of the Ctis pressurized spaces. Then a single vent hose comes off the right end of the axle housing and is routed to the vent up behind the cab. So a leaking Ctis seal...

Your predicament sounds familiar. Check out this thread: https://www.steelsoldiers.com/showthread.php?146118-LMTV-Front-Diff-Pinion-Seal/page2&highlight=120501092E There's some chaff at the beginning so be sure to read to the end. Summarizing: My blown seal (on the front pinion) was...