4H vs Auto

[tsbond]

Took 20 seconds to ask on this forum. A forum where people share ideas and people ask questions. Why so angry about it? Just ignore me man hell I am just asking a question. Not sure what the issue is.

[yousaveone]

Not sure what the deal is with some people on this forum.

I use the Auto 4WD when the roads are icy in spots. Otherwise don't use it. If its dry use 2WD; consistently slick use 4WD

 

When its in Auto its always prepared to go into 4wd the transfer case has a wet clutch pack these are what's used to engage the auto 4wd. They will wear and in addition driving in 4wd Auto cuts down on fuel economy. Basically its for those half and half conditions.

 

[Minnvmax]

I agree with above post. If constantly slippery, I will use 4H. If intermittently slippery I use Auto. And by slippery I am talking snow/ice. 

[bearded_warrior]

I found this before, similar to what's in the manual but has a good description of the 4x4 modes: https://www.gmc.com/gmc-life/how-to/when-to-use-four-wheel-drive

Also one on the drive modes here for some light reading: https://www.gmc.com/gmc-life/trucks/all-new-sierra-traction-select-system

[JimCost2014]

On 2/18/2020 at 8:02 PM, tsbond said:

Thanks that makes sense was just wondering how it worked basically. That explains it much better.

You are very welcome.

 

Don't take the bait, be the smart fish and swim around the replies that don't help....