GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 8 of 8
  1. #1

    Default Transfer case noise

    Hello all, new to this forum but not new to working on vehicles of all sorts.
    Current fleet includes 2007 HHR, 2002 Malibu, 1966 Chevelle SS, 1984 Chev 3/4 4x4, 1995 Pontiac Transport, 1968 Ford Bronco and the curent problem child a 2002 GMC Jimmy.
    The Jimmy just had the motor replaced (I bought it with the motor failing) and during the swap I visibly damaged the front diff actuator cable. After the motor was running I tried the 4x4 (4 button electronic NP8 option) and everthing worked. Didn't like the look of the kinked cable so I replaced it.
    At first startup the service 4x4 light went on and hasn't been off since and the transfer case is locked in 4x4. During the actuator cable swap I dissconnected the cable sensor and re-attached without incident.
    Now when the 2HI position is requested I can hear the transfer case motor running and I get some clunking on the RH kickpad but the 4x4 light flashs back on and the front driveshaft is engaged but the front actuator has pulled the RH front wheel out and it is dissengaged.
    Tried removing the battery for a day (in the hope of clearing the transmission codes if any) then re-attaching and still get the same condition. Have an OBD11 reader and cleared one misfire code (old spark wires = replaced) but no other codes showing via reader.

    Last edited by guzjimmy; 11-18-2012 at 10:12 AM.

  2. #2



  3. #3


    Welcome to the G M T C ! I think you might get more responses if you would post your problem in one of the "Tech." forums. Good luck!

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  4. #4


    Welcome to the club Jimmy, it's good to have you aboard.........

    2002 Chevrolet Silverado Extended Cab SportSide: See Mods in My Garage

  5. #5


    I hope that you find the Info you need.

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage:

  6. #6


    Welcome to the club buddy.
    1994 GMC Yukon, 2 door, Victory Red
    Garage Link:

  7. #7

    mfleetwood's Avatar
    Join Date
    Jul 2010
    Denver, CO
    Blog Entries


    Welcome to the Club!!!

    I moved your thread to the correct section. Sorry, I cannot help you with your problem but someone should be along soon who can.

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  8. #8


    That front actuator cable is operated by a vacuum motor, the cable moves a disconnect actuator to tie the inner and outer passenger side drive axles together when in 4x4. I haven't looked at the vacuum setup for a few years, so, let me walk you through the electric setup it is probably the same, but it may only be a guide for you.

    When one of the 4x4 positions is requested by the driver, the t-case en-coder motor move to the 4x4 position to operate the forward clutch. A command is sent to the disconnect actuator to connect the axle halves. In the electric version, the complete operation of the disconnect actuator into the connect position closes a signal contact that sends a ready signal to the t-case control module which completes the encoder motor/clutch operation. In other words, power is not sent to the front wheels until the two axle halves are coupled.

    Could you have damaged the switch, or wiring?

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

Similar Threads

  1. Transfer case noise
    By Shiloh24 in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 8
    Last: 04-27-2012, 09:02 AM
  2. transfer case noise
    By ktmkid007 in forum General Chevy & GM Tech Questions
    Replies: 0
    Last: 03-11-2011, 11:43 AM
  3. help! transfer case noise
    By Andy H in forum GM Powertrain
    Replies: 1
    Last: 02-21-2010, 10:49 PM
  4. 4x4 low transfer case noise
    By bandy in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 10
    Last: 04-06-2009, 09:11 AM
  5. Grinding Noise In Transfer Case
    By CMXIII in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 2
    Last: 07-09-2007, 01:43 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts