Auto Parts: 94 s10 manual lever 4x4 problems, vacuum modulator, pep boys

Question
I have a 1994 S10 v6 4x4 auto with the manual shift lever for 4x4. Even though it is in 2x4  driving at speeds 55mph or higher the 4x4 engages and disengages with a thud when you drop below 30mph

Answer
Hi Paul,

I suspect that the vacuum diverter valve on top of the transfer case is faulty or there is a problem with the vacuum modulator which should be under your battery. I've heard of quad-driver modules causing that same problem, but not very often. Check the diverter valve as I'll bet that'll be the problem.

Looking for a reputable service technician? My advice on finding a good technician is: Steer clear of the dealership and 'chain' stores like Firestone, Sears, Pep Boys, Monro Muffler/Brake, Midas, etc. as they usually only employ ONE ASE Certified Tech just so they can say they do and chances are, that guy is the asst. manager or manager and is not in the store to diagnose/repair vehicles anyway. Find a service location in the link below or get some names out of the yellow-pages and do a drive-by. Garages that employ ASE Certified Technicians will be marked with the 'Blue-Seal' insignia. If unsure about whether a place employs Certified Techs, just ask to see their credentials. ALL ASE Certified Technicians will be PROUD to show and display their certificate(s).

Thanks for the question, I hope this information was helpful to you.
Fred
Knucklebusters Used Auto & Truck Parts, Inc.
www.knucklebusters.us
570-453-0910
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