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shifting at a stop???? help!

Discussion in 'Performance and Tuning' started by Bearskill, Feb 5, 2009.

  1. Feb 5, 2009 at 6:58 AM
    #1
    Bearskill

    Bearskill [OP] Well-Known Member

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    I don't know if this is the right place for this question or not. There is no thread for transmition or drive line. Ok, When I roll up to a stop light, randomly, after I stop, the truck lerches forward just a little bit. its gentle, but it feels like the truck trys to shift down after I have came to a stop. It weird. sometimes I can barley notice it, but lately it's more of a clunk/thud. I only have 33k on the truck. Any Ideas before I take it to the dealer?
     
  2. Feb 5, 2009 at 7:21 AM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The auto tranny wont downshift into first until you come to a stop, or give it more than 75% throttle when going below 20 mph. If its makeing a "Clunk" noise, sounds like you have some slop in a "U" joint, or in the rear end. If thats the case, take it in and let them fix it.
     
  3. Feb 5, 2009 at 10:35 AM
    #3
    Janster

    Janster Old & Forgetful

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    When it 'lurches' - do you notice an increase in the RPM's?

    The Automatics are known to do that. They downshift after you come to a stop (As Chris mentioned). Mine - if I'm sitting in a fast food joint drive-thru for too long at idle, I can actually see my rpm's going back-n-forth without doing anything. Weird...but nothing alarming (to me anyway).

    If you have a 'clunk' - that's a different story. Since you have a lift on your truck, have you been getting any driveline vibrations?

    For starters - with the truck in park (and off), crawl underneath and grab the driveshaft and rotate it. Does it move at all?

    Are you still under warrantee?
     
  4. Feb 5, 2009 at 11:02 AM
    #4
    sonjay

    sonjay Well-Known Member

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    Is the AC on? When the AC compressor engages it will rev up a bit. If I'm going to be at a stop light for any length of time I put my truck in neutral. Something I have recently noticed with my truck is some slight play in the rear driveshaft slip joint? I'm not sure what to call it, where the rubber boot is over the splined shaft, just after the carrier bearing. This slight play causes a "clunk" sometimes for me.
     
  5. Feb 5, 2009 at 1:14 PM
    #5
    Bearskill

    Bearskill [OP] Well-Known Member

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    Well, I am at 33k. The power train is covered till 60k if I am right. Now I have been told that with the bigger tires on, that will mess with my warenty, but I think that is crap. No A/C on. I don't think I have ever used my A/C. I have not noticed if the RPM goes up or not. I figured that the down shift at a stop was normal. But in the last two weeks it has done the clunk thing maybe 5 times now. It's not bad at all, just enough to make me think "Well what the heck was that?" Oh, and I have never had the drive line shimmy due to the lift. So far I have been one of the lucky one that don't have it. Always smooth. The rear end is only lifted 2''. On the way to work today and at luch I tried to get it to do it, but hasn't yet today. This weekend I will climb under it and see if I can get some play out of the driveline and joints. Thanks for the input, I know it's not just me now. Any more input would be great!:D
     
  6. Feb 5, 2009 at 1:34 PM
    #6
    hillbillynwv

    hillbillynwv Well-Known Member

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  7. Feb 5, 2009 at 3:54 PM
    #7
    boogie

    boogie Well-Known Member

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    My 05 DC 2WD does the same exact thing. There is no change in the RPM's when it occurs. Not in my case anyway. I've got 62K on the truck. Bought it with 50K and have noticed it ever since I've had it.
    It did it before I had the lift installed as well.
     
  8. Feb 5, 2009 at 4:54 PM
    #8
    Bearskill

    Bearskill [OP] Well-Known Member

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    Wow! after looking at the other thread, it seems like a lot of people have experianced what I am talking about. When it does the gental version it just moves the truck a bit. If you had the breaks pressed a little more than normal the truck would not move at all. But when it does the more clunky one, it almost feels like someone rear ends me just a little bit. Like a little tap on the bumper. Im still going to check my drive line this week end, but it sounds pretty normal from all the people writeing in.
     
  9. Feb 12, 2009 at 7:53 AM
    #9
    Bearskill

    Bearskill [OP] Well-Known Member

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    Well got under it and looked at the whole drive line. Everything seems rock solid. there was a little play at the carrier bearing, as in the rubber seal gives a little, everything felt tight, but thats normal right?
     
  10. Feb 12, 2009 at 7:54 AM
    #10
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Yepo!
    Play at the carier bearing should be about 1/2" when moveing it by hand. :)
     
  11. Feb 12, 2009 at 8:13 AM
    #11
    harshest

    harshest I am the Sofa King

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    My 05 does the auto lurch. The RPMs do increase. The scanguare shows upper 500's at idle and the goes to the upper 700's so about an increase of 200 rpms. However I don't get any clunk, just the axel wrap "thud" when I let off the brakes.
     
  12. Feb 19, 2009 at 10:07 AM
    #12
    Bearskill

    Bearskill [OP] Well-Known Member

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    So now it is doing clunk thing as I come to a stop, stopped, and as I let off the breaks to start moveing again. Is it axle wrap? Are my breaks not engageing and disengageing at the same time? Or is it the tranny/diff?
     
  13. Feb 19, 2009 at 11:05 AM
    #13
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Axel Wrap.
     
  14. Feb 19, 2009 at 11:29 AM
    #14
    NewJay

    NewJay Well-Known Member

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    Hey Same with me 05' It almost feels like somebody just bumped into the rear of you. My wife was driving the other day and we were at a traffic light and it did that, she just new somebody had hit us. NO noise at all though just a little jolt.
     
  15. Feb 19, 2009 at 11:40 AM
    #15
    Bearskill

    Bearskill [OP] Well-Known Member

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    Maybe Im just picky, but I don't like things feeling loose on my ride. Im going to reaserch more, but if it is axle wrap, Im going to spend the $500 on the Pro Comp traction bars.
     
  16. Nov 16, 2010 at 5:43 PM
    #16
    moulin6801

    moulin6801 Well-Known Member

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    I have a 2010 Auto TRD Sport. I too feel this bump when I park, it sucks because it often gives a jerk forward, even after come to a stop, 5 secs later and bump!
    Having issues with low speed. I have 35mph for miles to get home in up and down road and tramsmition shift like crazy, jerk back and forward.
    It really sucks!
    Took to the dealer, they did a computer flush and update, guess what?
    Nothing, same problem is there.
    Love the truck otherwise but this is frustrating...
    Don't know what to do next. Any ideas???
     
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