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  1. #1

    Default 2001 VSS wearing out in minutes

    To everyone reading this thanks for your time. I have a 2001 silverado Z-71 and recently stumbled upon a huge problem. Occasionaly on the interstate my speedometer cut out and the truck downshifted, speedometer would kick back on rather quickly and transmission would re adjust. This happened 2 or 3 times. Less then a week later the speedo began to cut in and out and the transmission would shift according the speedometers reading. After some quick help from google i determined it was the vss(s). I replaced the 2 on the rear of the transfer case and the one on the front as well. The two rear ones had a groove worn into them. Within the first few minutes of my testdrive the same problem began to occur again. I nursed the truck back home, pulled the sensors and the new ones (2 rear) already had the same "groove" worn into them. Any suggestions greatly appreciated, it looks to me like something in the transfer case which is beyond my mechanical ability.

  2. #2


    it sounds like the tone ring that drives the VSS is loose or somehow out of tolerance and allowed to contact the vss. Time to start pulling stuff apart and find out why you're having physical contact in a place where there's not supposed to be any contact.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

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  3. #3


    Welcome to the club. X2 what Crawdaddy said.

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

  4. #4


    To clarify, the tone ring should not touch the VSS, but it should be VERY close to it. I don't know the spacing off-hand, but it's less than 1/4".

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