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Discussion Starter · #1 ·
I have a 07 2500 silverado duramax. I have not pulled with it much at all, I am pulling a 5th wheel that weight is 12,600 lbs. I have EFI live with the towing mode that will shut down the turbo when you let off the fuel pedal. When in the manual shifting mode of the transmission is it better to manually shift the trany with the shift button or let it do it automatically? I don't want to over rev the rpms going up and down mountains. What is a safe range of rpms to watch for? One more question, when you are not pulling hard an running pretty much on level ground is it ok to shift into 6th gear or stay in 5th?

Thanks
 

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The Good Son!
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2,400 Posts
I would let that beast do her Business in Auto, JMO! One of the things that set our trucks apart from dodges/fords are these tranny's.
 

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Premium Member
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18,259 Posts
On the downgrades the trans may raise the engine RPM up to 4,800. That is part of the brake design--and will now hurt the engine or trans. :D
 

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24,783 Posts
Any actual "tow tune" wont let the truck hurt itself while towing. With that mutch weight the tow tune shouldnt be that mutch of a HP gain. Id leave it int "tow haul" mode automatic and let the truck shift itself :cool:



 

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24,783 Posts
Any actual "tow tune" wont let the truck hurt itself while towing. With that mutch weight the tow tune shouldnt be that mutch of a HP gain. Id leave it int "tow haul" mode automatic and let the truck shift itself :cool:



 

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I would leave it in auto definitely
 
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