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  1. #1

    Default Odd noise coming from drive train.

    I have a 2000 Express 3500. 180,000 miles tranny replaced about 20k ago. It recently developed an odd condition... during the 1st 10 min of driving it will make a deep knock somewhere behind me in the drive train. It doesnt happen often but it usually will happen at parking lot speed or around 45 mph. I also noticed it when turning a sharp right in the parking lot. It all seems to go away after about 10-15 min of driving.

    I checked the u-joints for play
    I checked my differential fluid and it seems fine.
    I have had a bad spark plug on a ford truck do something similar but this hesitation or knock is very irregular and the ford did it constantly.
    I have purchased new plugs and wires but am waiting to dive into that project till I do a bit more research.
    I left it parked since I noticed the issue because if its a tranny or other issue i dont want to make it worse.

  2. #2


    did you ever figure this out? could just need the slip yoke greased. drop the drive shaft, lube the slip yoke up real good, inside and out, then reinstall. when mine needs lubed it is more of a high pitched "clank". is it a continuous knock or just one time? I know that when the rear carrier bearings start to go out they will make a knock when you load one side (turn left or right)

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3


    Does it do it when turning only or also when going straight?

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