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2017 Sierra HD PRNDL 1 question

tg4398

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tg4398 New Member

tg4398

Posted
Posted

Hi everyone, I probably have a stupid but simple question that I cant seem to find the answer to from my dealer or manual. I have a new 2017 crew cab 6.0 2500 hd the has the number 1 to the far right of the PRNDL. I understand the manual shifting aspect of the transmission but I'm looking for what the number 1 represents and its intended use on this truck. Any help will be greatly appreciated. Thank you!!

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SMiller Senior Enthusiast

SMiller

Posted
Posted

locks in first gear

Yep it's 1st gear only, pretty pointless seems how you can do the same thing by putting it in manual and pressing the - button down to 1.

SMiller Senior Enthusiast

SMiller

Posted
Posted

Would have been nice if gm used it to show what gear the trans is actually in while in manual versus just max selected but oh Well lol

You mean like the Super Duty does...

redwngr Senior Enthusiast

redwngr

Posted
Posted

1 is so you can lock in 1 without cycling down using the +/- button,

 

Manual mode will show the maximum gear currently available (as opposed to the current gear)

 

The gear the transmission first selects when switched to M mode depends on which gear the transmission is currently in. There is a chart in the owners manual.

SierraHD17 Senior Enthusiast

SierraHD17

Posted
Posted

You mean like the Super Duty does...

Or any Ford truck... or most of their cars lol. I mean what GM does as manual mode the Ford's do in the regular D mode... manual actually holds the gear.

rocnrol Enthusiast

rocnrol

Posted
Posted

The "1" is not for locking it into first Gear. It's best used when towing (but can be used anytime) and going down a hill. Dropping it into this position will make the truck best hold the speed the truck was going when "1" was selected. It works amazingly well, I use it often when towing in the mountains and it really saves on the brakes. It will, depending on the conditions, downshift low enough that the engine will rev quite high, but that's fine.

 

Sent from my STH100-1 using Tapatalk

SMiller Senior Enthusiast

SMiller

Posted
Posted

The "1" is not for locking it into first Gear. It's best used when towing (but can be used anytime) and going down a hill. Dropping it into this position will make the truck best hold the speed the truck was going when "1" was selected. It works amazingly well, I use it often when towing in the mountains and it really saves on the brakes. It will, depending on the conditions, downshift low enough that the engine will rev quite high, but that's fine.

 

Sent from my STH100-1 using Tapatalk

You do know you can do the same thing by just using manual mode right?

rocnrol Enthusiast

rocnrol

Posted
Posted

You do know you can do the same thing by just using manual mode right?

Sure, or you can also drop it into the 1 position. It was asked why it's there, and I explained why.

 

Sent from my STH100-1 using Tapatalk

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

Sure, or you can also drop it into the 1 position. It was asked why it's there, and I explained why.

 

Sent from my STH100-1 using Tapatalk

Doesn't it just force the trans to maintain downhill speed sort of like it does when you depress the brakes on a downhill grade in t/h? My understanding is it will grade brake in "1" in an attempt to stop the truck?

 

I've never used it...just my understanding of what it states in the owner's manual.

 

Sent from my SAMSUNG-SM-G900A using Tapatalk

rocnrol Enthusiast

rocnrol

Posted
Posted

Doesn't it just force the trans to maintain downhill speed sort of like it does when you depress the brakes on a downhill grade in t/h? My understanding is it will grade brake in "1" in an attempt to stop the truck?

 

I've never used it...just my understanding of what it states in the owner's manual.

 

Sent from my SAMSUNG-SM-G900A using Tapatalk

Pretty much... only I don't know if I'd say it's attempting to stop the truck. It's much more effective than grade braking in tow/haul mode I find, when used on the steeper, longer grades

 

Sent from my STH100-1 using Tapatalk

8lugCT Enthusiast

8lugCT

Posted
Posted

1 is so you can lock in 1 without cycling down using the +/- button,

 

Manual mode will show the maximum gear currently available (as opposed to the current gear)

 

The gear the transmission first selects when switched to M mode depends on which gear the transmission is currently in. There is a chart in the owners manual.

What truck do you have? Mine shows what gear it's currently in when I select manual

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