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Thread: 1997 GMC K3500 speedo not working

  1. #1

    Default 1997 GMC K3500 speedo not working

    I have a 1997 K3500 diesel. Trans was not shifting properly. I changed the speed sensor at the transfer case. Now trans is shifting ok. But now thw speedo does not work. It worked inaccuractly prior to changing speed sensor, but now it does not work at all. Does anyone have any suggestions to help solve speedo issue?

  2. #2
    Join Date
    Sep 2001
    Location
    Lubbock TX, USA
    Posts
    4,194

    Default

    Sounds like a bad VSSB Module, Research VSSB Module on google for a company called Unique Diesel, they remanufacture these.

    John
    1982 C10 SCSWB 6.5TD, mods too extensive to list. (13.69 1/4 mile @94.6 MPH) RACE TRUCK
    1982 C10 SCSWB 6.2NA, 2.73 700
    1986 C10 SCLWB 6.2TD 3.73 700
    1989 V20 SUB 6.2NA, 3.73 400
    1994 G20 VAN 6.5NA, 3.42 60E
    1994 K20LD ECSWB 6.5TD, 3.42 80E
    1995 K20 SUB 6.5TD, Wrecked, ran into by stupid teen.
    1995 C3500HD DRW 6.5TD, 12' Flatbed 5.13 80E
    1995 C3500HD DRW 6.5TD, 18' Rollback Wrecker 4.63 80E
    1994 C20HD ECLWB 6.5TD 3.73 80E Wifes Truck.
    1995 C20LD ECSWB 6.5TD 3.73 80E
    1995 K20LD SCLWB 6.5TD 3.73 80E
    1996 K30 DRW 6.5TD 4.10 80E
    1997 C10 Tahoe 2Door 2WD 5.7L to 6.5 Conversion Underway

  3. #3

    Default

    thanks, I will check that out.

  4. #4
    Join Date
    Nov 2015
    Location
    georgia
    Posts
    8

    Default

    I just ordered a vssb from unique diesel today. John is very helpful. My vssb has water damage and some broken connections. I hope this will fix my shifting issues.

  5. #5
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Poor connection issues happen, but if your VSSB has water damage, you may have bigger fish to fry (maybe literally).
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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