Truck Jumps Forward During Startup

[Red Crew]

I have 2006 Chevy Silverado 1500 4x4 Crew Cab that has a tendancy to jump forward when I start the truck. This happens about ones a week. It only moves an inch or two but I can definately notice it. Let me know if you have any ideas. I'm getting near 60k miles so I planning to get the tranny fluids and filter changed.

 

Thanks in advance,

Red Crew

[Ranger]

Definitely a transmission problem...If it still does it after the flush take it to a tranny shop for diagnosis. The only thing I've ever had jump on me when starting is my Raptor, and only because I leave it in gear and just clutch when starting 90% of the time.

[digitalembrace]

I have 2006 Chevy Silverado 1500 4x4 Crew Cab that has a tendancy to jump forward when I start the truck. This happens about ones a week. It only moves an inch or two but I can definately notice it. Let me know if you have any ideas. I'm getting near 60k miles so I planning to get the tranny fluids and filter changed.

 

Thanks in advance,

Red Crew

 

 

Less than 60k and within 3 years of purchase? If so Get it back to the dealer now for warranty!

Regards Mike

[jbordi]

NFORMATION Bulletin No.: 08-07-30-026

 

Date: May 22, 2008

 

Subject:

Information on Slight Vehicle Movement In Park At Start Up After Cold Soak Models:

2009 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn)

2009 and Prior HUMMER H2, H3

2009 and Prior Saab 9-7X with Automatic Transmission

 

Some vehicles may rock or move slightly forward or rearward while in park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.

 

This slight movement is due to the residual transmission fluid in the clutch packs that creates a partial apply on start up. This movement is stopped by the parking pawl and/or transmission fluid exhausting completely from the clutch packs.

 

This slight movement has no adverse affects on the transmission and no repair should be attempted. This condition is normal. This can be verified by comparing with another identically built vehicle under the same cold conditions.

 

To prevent this condition from occurring, the parking brake should be utilized as per the Owners Manual recommendations anytime the vehicle is parked.

[Draenor]

I have the same problem in my '01 Blazer. As Jarrod posted, I have not seen any adverse affects, nor any damage occur from it. It does scare the hell out of me every time it happens though. Think, I would of gotten used to it by now.

[Z45]

My 08 GMC occasionally does this, maybe a 1/2 doz times in the last 1.5 yrs.

 

A friend has a 2009 Yukon that he says also does it.