old 300

This has likely been talked about here before but tonight I got my truck back from the garage for a failed brake line and I was playing with her in the driveway. I slipped it in 4 high and no 4wheel light. I tried 4-low same thing,and I even drove in a tight circle and she was free wheeling( no wheel binding). I looked under the truck at the vacuum lines but couldn't see anything apart. I drove on the road a short distance in 4x4 to see if it would engage but nothing. Any body have this happen to them, it worked a few weeks ago as normal but now nothing.

patdaly

If it was the hard line along the frame, look at the transfer case, drivers side towards the top, the vacuum lines connect there in a 4 line block, easy to bump it and have it fall off.

infidel

TxDiesel007

no more issues if you posilock it and forget about it...

infidel

Homemade $30 Posi-Loc http://www.jeepforum.com/forum/showthread.php?t=595515

Don T

Just installed Posilock on my truck and I love it. Wish I would have done this years ago.

kujo

i was working on a buddys 1/2 ton and the rubber connector at the t case where the 4 lines go in was leaking .. i put a zip tie around it to hold it tight for the time being and its still working.

SIXSLUG

Vac leak somewhere not holding it in 4x4.

Check all fittings and see what you can find.