Transmission or other Drive line issues???

Discussion in 'GM Powertrain' started by sgodder, Oct 1, 2008.

  1. sgodder

    sgodder New Member

    2002 suburban 4x2 105000 mi...just had 90K mile factory recommended service/PM,(all fluids done).
    Engaging transmission into D or R from Park is a hard or rough engagement. once driving, shifts up thru the gears nice and smooth. When first speeding up or when slowing back down, under 25 mph, clicking noise is heard and felt from the rear end. Also, at 65mph and above there is a substantial vibration. I have had the Michelin tires rotated and balanced, dont know if all of this is realated.
    Any ideas before I take it in and someone wants to sell me a new transmission? Is this tranny, rear diff, any other driveline issue?
    Last edited: Oct 1, 2008
  2. MrShorty

    MrShorty Epic Member 5+ Years 1000 Posts

    Next thing I would look at would be the u-joints in the driveshaft. I don't know if you have drum brakes or disck brakes in the rear, but, if you have drum brakes, I might also pull the drums off and make sure something hasn't come loose. Where you just had the fluids changed, you might make sure they filled the rear diff up full and that the fluid looks clean. I would probably also check the transmission fluid level that they got it correct.
  3. 57 shaker

    57 shaker New Member

    transmission or driveline issue

    SGODDER a clunk when going from rev. to dr.,105k miles,trans shifts ok,and a clicking noise at hiway speeds is a classic u-joint MRSHORTY in my opinion is correct ding!ding!ding! good luck :great:
  4. CoolAirVw

    CoolAirVw New Member

    Some trouble codes can cause a "high line pressure failsafe" in the transmission. Computer notices something, triggers a code then makes the trans shift hard trying to protect it.

    Scan computer system for codes, after you check your u-joints.

    Also the pressure control solenoid can stick causing "high line" as well.
  5. sgodder

    sgodder New Member

    follow up

    I thought I owed you guys what the problem actually was and that is a bad driveshaft and u joints. I had the it all replaced and it is running like a charm. Thanks for all the help!
    Last edited: Dec 4, 2008
  6. CoolAirVw

    CoolAirVw New Member

    Thanks for posting the fix.

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