Question about 1999 Chevrolet S-10 Pickup
I have a 99 Chevy S10 4x4 pickup with the vortec v6, when driving in 2 wd it sounds fine then a whirring noise starts and gets louder as I slow down, but when I switch to 4 wheel drive the noise goes away, then when I switch back to 2wd it is quiet for a few seconds then it starts whirring or buzzing again like there is no oil or something is locking up, but I have no problem with the 4 wd. any info would help.
I had the same problem.. it is the vacuum switch on the transfer case. the switch is stuck open and supplying vacuum to the vacuum diaphram under the battery box. the switch is located on the upper side of the transfer case ( not the front differential) which is located driver side of the transmission. the switch cost me about $25.00. I replaced it myself. if you do your own mechanical work you can get it done just be patient.
Posted on Dec 09, 2008
Sounds like the axle lock shift soleniod. it works like a p.t.o. you can pull it off and ispect the interlocking gears. you will need to remove the cv axle first and then its the tube on the passenger side. wach for a washer when you reinstall. its centered on the shaft on the shift solenoid side. if you need any other help feel free
Posted on Oct 01, 2008
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