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09 Sierra 4wd Hard To Engage

TriumphoverU

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TriumphoverU Enthusiast

TriumphoverU

Posted
Posted

Well fellas, as the title says, I have the floor shift 4wd in my 2009 GMC Sierra. Last year during the first winter I had the truck, I could literally reach down with 2 fingers and pull it back into 4wd. This winter, for what ever reason, getting the truck into 4wd for the first time of the day is difficult to say the least. I'll be cruising down the road and decide that I want 4wd, and try to shift into 4wd. Some times I can not get it to shift at all until i come to a stop and put the truck in neutral, then it will shift.

 

I've checked all tire pressures to make sure they are equal but this didnt change the effort of shifting. Something has definately changed from last winter, because it never used to be this difficult. After I get it shifted into 4wd for the first time, it will go back into 4wd much easier the 2nd, 3rd, 4th, etc times. Any suggestions?

08BlackSierra Enthusiast

08BlackSierra

Posted
Posted
lube the linkage.

 

 

Def sounds like the linkage needs some lube. More than likely theres some corrosion. Rust somewhere causing it to hang up. If that doesn't fix it then I'd wheel it back to the dealership.

Autonut Enthusiast

Autonut

Posted
Posted
They still make floor shift? :lol: I thought that went out with Jimmy Carter.

 

Push buttons are for girls, Real men have sticks........ :)

brainpause Enthusiast

brainpause

Posted
Posted
They still make floor shift? :lol: I thought that went out with Jimmy Carter.

 

Push buttons are for girls, Real men have sticks........ :)

 

 

Guess I'm a girl. Love my push buttons.

 

Guess I don't have a real truck either. I have spark plugs.

 

Larry

oldmann Senior Enthusiast

oldmann

Posted
Posted

Ice could be forming on linkage. Once you break it it would be ok. Also make sure you are rolling and not under load.

TriumphoverU Enthusiast

TriumphoverU

Posted
  • Author
Posted
Ice could be forming on linkage. Once you break it it would be ok. Also make sure you are rolling and not under load.

 

I dont believe it to be ice buildup, but I guess anything is possible. If I am not moving it will shift easily. The problem arises when I want to engage on the fly, say at 50-60 mph. Constant throttle, decel, accel all yeild the same results, no shift or a very difficult shift. Then as I said before, once I get it to shift the first time, it will be fine the rest of the day.

 

I do have an appointment with the stealership on the 15th, but I'm guessing they are going to tell me that "it is normal" or "we could not replicate the complaint"

 

All I know is that last year I never had a single problem with it at all, and now if I dont put it in 4wd before I leave the driveway, its a craps shoot as to whether or not I'll have 4wd when I want it later on in my trip.

TriumphoverU Enthusiast

TriumphoverU

Posted
  • Author
Posted

For anyone who is interested in this topic, the dealership looked at my truck today and found a bulliten on this issue. Basically the bulliten says to replace the front diff fluid. The service writer and myself both are highly skeptical, and I will not know if it worked or not until the temps get cold again.

 

At the very least I got the fluid changed in the front axle :smash:

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