Question about 1991 GMC S-15 Jimmy

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4 wheel drive went out in my 91 s-15 jimmy

One day it worked, next day it didn't. Was told that something on top may have rusted thru or a hose may have come off, but with out a diagram I don't know where to look

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Several places to check first one is the vac line on the ball mounted to your hood. if its ok then under the truck on the transfercase is the vac switch disconnect it and check for vac.. if you have it put vac line to actuator its uner the right innerfender it controls the front diff lock.. if its functioning then you just ned to replace the vac swithc in the transfercase its just screwed in.. the lines to the 4x4 system are plastic and rubber mostly..

Posted on Jan 20, 2009

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sounds like you have a combonation trans and transfer case issues. if you were running youre truck in four wheel on a hard dry surface, witch is not recomended , the trans probibly ran hot. as for the transfer case, it could be a combination of problems. dash switch/ actuator/vacum switch/ vacum canister witch is under the battery tray. all have to work in unison. service the trans first. if the truck has high miles, add trans conditoner, if you do not, it will slip. then the transfer case. refer to youre owners man for oil specs. youre problems are not uneque as these trucks are notorius for unreiable four wheel actiuation. hope i was some help.

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