four wheel light stays on

[jeepmud13]

had my truck stuck in a snow bank and put it in four wheel drive and after i got it out i put it back into 2wd and the light is still on. i put it in reverse and drove back 15 to 20 feet and its still on. whats up with that???

 

88 4.0 4x4 5spd

[feerocknok]

had my truck stuck in a snow bank and put it in four wheel drive and after i got it out i put it back into 2wd and the light is still on. i put it in reverse and drove back 15 to 20 feet and its still on. whats up with that???

 

88 4.0 4x4 5spd

 

Vacuum leak?

[87manche]

the light does not sense the actual T-Case setting, just that the t-case is sending vacuum tothe CAD motor on the axle. The light is driven from a vacuum switch under the coolant bottle on the firewall.

Verify that the T-Case is actually shifted out of $WD, then start in on the vacuum system. It's possible that the T-case vacuum switch is stuck/broken and just feeding vacuum even though the T-case is in 2wd.

Jack up the front axle, then try and turn the front driveshaft by hand, if in 2WD it will turn, if in 4wd it will be locked in with the rear DS.

[Pete M]

If you need it, here's the page from the shop manual: