Jimbo45

For the sake of discussion, I will call my issue the "First Five Feet Shudder", to differentiate it from the higher speed towing and load induced shudder.

I had some time to do more testing tonight before the storm. No difference in shudder (still present) with varied load, trans temp, trac control on/off, RCS on/off, or Tow-Haul mode on/off. It does not shudder in reverse, ever, no matter what condition I tested.

The only thing that changed the shudder in forward motion, was 4wd. In 4wd, I couldn't detect the shudder on launch. It did feel different on the launch, as in not as mushy, and I really didn't feel the shudder. Strange.

So, this leads me to believe that the trans is not causing the shudder, since it should be present in 4wd also, if the trans/torque convertor were the cause. So, that leaves the issue somewhere behind the trans, and up to where the rear rubber meets the road.

Maybe this is a driveline angle/suspension/spring wrap thing afterall. Considering, it won't do it in reverse ever, 4wd eliminates the shudder, and it won't do it if I take of mildly.

Interesting findings tonight. I guess its good news, since it seems to rule out being a trans issue, which I was most worried about.

I just can't believe more of you folks aren't feeling this quick "first five feet shudder" on agressive launch, if it is a characteristic of some/most of these trucks!?

Toolmanbmw

That really sounds like it's somewhere near the rear end. 4WD would take some of the torque and put it on the front wheels.... So less twisting in the rear. I know mine started after they lube my rear carriage bearing (I think that's what it is call). Sigh... Maybe it is suspension related and our truck just hasn't got it really bad yet.

Jimbo45

Hmmm....carriage bearing. Not sure what that would be. You have a 2 piece drive shaft? What was the issue they were addressing when they lubed this bearing? Any other work or disassembly done on driveline or suspension at that time?

Toolmanbmw

I complain of a hard 1-2 shift and all I really wanted was the new transmission reflash. But they must have understood me wrong and gave me the reflash and lube the bearing near the second drive shaft. The tech claimed it was dry.... I have this minor issues since that last visit. Not sure what they had to take off to get to that bearing. No suspension work that i know of.

schrod

I think you are meaning carrier bearing but I was not aware of a carrier bearing on the drive shaft. Maybe there is one on you guys two piece drive shafts. A self-aligning carrier bearing would definitely have a grease zerk on the outer portion to lubricate the self-aligning part. But I really seriously doubt that a self-aligning bearing would cause this shudder especially on something as new as your truck. Maybe after several years of driving with the road buildup on it.

Toolmanbmw

Yeah not sure what they did under there...

But I was able to confirm some testing that jumbo did. Using 4wd does make this feeling go away. It's not there at all.... So weird

Jimbo45

Bump for others that may have knowledge of this topic. Anyone test for the first five feet shudder? I am going to crawl around under my truck this weekend, to see if anything may be loose, driveshaft, suspension or trans mount, wise. I wonder, are these one piece shafts indexed or phased to the pinion shaft hub? Could being 90 or 180 degrees out, cause a wobble? I know, I'm grasping at straws....

dac12046

My dealer told me it could be my rear brakes sliding said it need to be lube up never really checked but I still have the shudder once in a while on take off

justjimmy

I recently had this. It happened from a dead stop. Press the gas and it felt like the tranny was slipping... just at take off... 1st gear.

Had it reflashed and solved it.

Jimbo45

Interesting. Can you tell me your build date?

I actually got to drive my truck a little today, and some of it when the roads were wet after a rain. Seemed to notice the take off shimmy a little less when it was wet maybe. But, that could have been due to me taking off slower, since it was wet.

I will probably contact the dealer next week and see what they say about it. I just hate to have them tear into the trans if its not necessary, you know what I mean? Thats how other problems get started....