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Author Topic: np 208 leaking out vent tube when in 4wd  (Read 1817 times)

Offline pholliday1

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np 208 leaking out vent tube when in 4wd
« on: November 08, 2012, 12:14:20 pm »
Does not leak in 2wd, vent line has been extended by way of rubber hose and vent cap up firewall. Fluid level in case is normal and im not losing tranny fluid into t case. Only when i'm in 4wd it "leaks" out the vent line.
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VETERAN AND LIFETIME NRA MEMBER. WHAT DO YOU STAND FOR?
1991 V3500 CREWCAB SRW 454TBI GMC
1991 v3500 crewcab SRW 454tbi 480le 6" lift
1990 V3500 crewcab Dana 60 FF 14b 5:38 ratio 40 inch 11" lift
1989 v3500 crewcab 454TBI 5" lift

Offline Captkaos

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Re: np 208 leaking out vent tube when in 4wd
« Reply #1 on: November 15, 2012, 07:02:02 pm »
that is strange, it is going up the tube?
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Offline pholliday1

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  • 1990 V3500 Crew Cab
Re: np 208 leaking out vent tube when in 4wd
« Reply #2 on: November 16, 2012, 08:46:24 am »
Yes it weeps out vent line. I've come to the conclusion that it has to have something to do with transfercase seal. Theres no other known condition to cause this effect. Very simple to pull transfer case and change seal, (lots of room with body and suspension lift) i'll report back with my findings.
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VETERAN AND LIFETIME NRA MEMBER. WHAT DO YOU STAND FOR?
1991 V3500 CREWCAB SRW 454TBI GMC
1991 v3500 crewcab SRW 454tbi 480le 6" lift
1990 V3500 crewcab Dana 60 FF 14b 5:38 ratio 40 inch 11" lift
1989 v3500 crewcab 454TBI 5" lift
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