The 4 wheel drive has quit working on my 1991 Jeep Wrangler and I need suggestions on how to get it working again?

Answer 1

Did this b/4I have a 94 wrangler with the vacuum switch on the transfer. It shouldn't be any different for your Jeep. The vacuum switch cost about $20 or less. Just get a big socket or wrench to remove and replace AND BE ABSOLUTELY CERTAIN OF THE VACUUM LINE ORDER/PLACEMENT. In fact, the way I did this was to use a huge socket wrench to break the threads loose after marking corresponding vacuum lines and nipples. If this doesn't do it, inspect the vacuum lines going to the switch.

If you do the vacuum lines check and all is good check the shifting fork, mine broke

on me. It cost 5 dollars at a junk yard.