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Slight "slip/bump" From Stop

McLeod

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McLeod Enthusiast

McLeod

Posted
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...new-to-me '03 2500HD 2WD 6.0 ext cab -- when starting from a stop, there's a slight "bump" (for lack of a better word) that seems like the transmission may be sliding into 1st gear. The trans doesn't seem to slip at all and changes perfectly...seems to do it the same hot or cold and, again, it's not a real bad "bump", but it is just noticeable at drive off. I had a similar "slip/bump", except much more pronounced, when my Tahoe drive shaft splines were not properly greased when reinstalling a rebuilt trans and transfer case, so I'm wondering if it could be "dry splines" with the 2500? (...or, could it be something to do with the 2-piece drive shaft...or, is it maybe the rear "spring wrap" that I've heard about? ..or, do I have transmission problem(s) on the horizon? Will greatly appreciate any ideas. Mc

Stevens03 Senior Enthusiast

Stevens03

Posted
Posted

Infamous Slip yoke issue. You can drop the drive shaft and grease the spline, reinstall and the bump will be gone :cheers:

txab Senior Enthusiast

txab

Posted
Posted
Infamous Slip yoke issue. You can drop the drive shaft and grease the spline, reinstall and the bump will be gone :cheers:

+1

McLeod Enthusiast

McLeod

Posted
  • Author
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Infamous Slip yoke issue. You can drop the drive shaft and grease the spline, reinstall and the bump will be gone :cheers:

Thanks! I was hoping that would be it! Now, about that "2-piece" drive shaft R & R....I'm "assuming" that I'll have to take the rear U-joint u-bolts off and drop it, of course, but I'm unsure about the center attachment (...1st time tackling a 2-piece drive shaft). Will I need to remove the bracket & drop it there, too, in order to slip it back and out of the transmission? Thanks, again! Mc

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

yes ,15mm nuts on the hanger brg mount.deep socket and air rachet works perfect.

 

do not forget to mark the rear shaft to the boot to the frt shaft with a paint stick or equivalant for easy reassembly

 

GM has whats called "special lubricant" for the splines or use regular grease

McLeod Enthusiast

McLeod

Posted
  • Author
Posted
yes ,15mm nuts on the hanger brg mount.deep socket and air rachet works perfect.

 

do not forget to mark the rear shaft to the boot to the frt shaft with a paint stick or equivalant for easy reassembly

 

GM has whats called "special lubricant" for the splines or use regular grease

Thanks! This will be tomorrow's project. Mc

jro909 Senior Enthusiast

jro909

Posted
Posted

it comes back :thumbs: my driveshaft has been out 3 or 4 times and it comes back realy quick...oh well ill live with it

tanked_darren Senior Enthusiast

tanked_darren

Posted
Posted
it comes back :thumbs: my driveshaft has been out 3 or 4 times and it comes back realy quick...oh well ill live with it

Do you do it yourself??

 

 

I've heard somewhere that you can get a nickel plated slip yoke , and that cures it, don't know anyone who has gotten one though....

98trck Enthusiast

98trck

Posted
Posted

I was wondering have you check the tranny mount and motor mounts

McLeod Enthusiast

McLeod

Posted
  • Author
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I was wondering have you check the tranny mount and motor mounts

Great suggestion! Yes, I did that right away, assuming that I'd probably find a busted trans. mount, but both engine and trans mounts are OK. Mc

tanked_darren Senior Enthusiast

tanked_darren

Posted
Posted

Does the sound resemble a barking seal or whalrus sometimes? Thats what mine does, and it's the slip yoke. (powertrain warrenty took care of it for now)

jro909 Senior Enthusiast

jro909

Posted
Posted
it comes back :dunno: my driveshaft has been out 3 or 4 times and it comes back realy quick...oh well ill live with it

Do you do it yourself??

 

 

I've heard somewhere that you can get a nickel plated slip yoke , and that cures it, don't know anyone who has gotten one though....

 

 

 

no i don't, the trans and driveshaft have been out twice each..i just live with the bump

jbannick18 Enthusiast

jbannick18

Posted
Posted

Mine never used to do it until I got rear ended and it sat in the shop for 5 weeks. It's been driving me nuts. Glad for all the information though so I can go into the dealership knowing what it is. I have a hard time trusting mechanics

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