revrnd
Apsley, Ontario
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Just curious if there's anyone out there using a 6 speed equipped GM truck as a TV. I was looking @ some pics of a 2010 2500HD & I see the shifter "quadrant" was like this:
P R N D M
Should I assume selecting D will allow the tranny to shift up to 6th (the 2nd OD gear)?
What does M allow the tranny to do?
When towing what do you guys use?
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Golden_HVAC
Fulltime, CA, USA
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Joined: 08/19/2003
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Hi,
The Cadillac that I drove has a M setting. There is a up and down arrow on the shifter column, and that will allow me to shift to 5, 4, 3, 2.
I usually just left it in D, and let it do it's thing. But if you are going down a long hill, then shifting to M and then using 5, 4, or 3 as the highest gear the transmission can shift into can be an advantage, especially when you are needing to use the brakes a lot, but simple engine braking can handle most of that braking load, saving the service brakes from overheating.
Make sure that you are not using lower than 4 gear at freeway speeds, and use the tachometer to make sure you are not over revving the engine if you have one. I would not want to go over 4,500 RPM. I would use the brakes to bring the speed down so the RPM is around 3,500 or so. Or downshift another gear, and slowing to less than 3,200 RPM before downshifting another gear will keep the truck from jerking when shifting down.
Good Luck,
Fred.
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revrnd
Apsley, Ontario
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Fred, thanks for clearing things up. 1 of the other pics showed the shifter w/ the tow/haul switch & the up/down switch.
1 more question, when you're using the up/down switch is there any indication on the dash as to what gear you're in?
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TomG2
Central Illinois
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Yes, on the 2500 HD, it indicates with a number beside the M which gear you are in. M3, M4 and so forth. It can be manipulated like a standard shift, by + up one gear at a time and - down one gear at a time. Great control. I suspect they copied the operation of the Allison transmission.
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glazier
Kentucky
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When towing use Tow Haul and D, this will allow the truck to downshift on hills. I use the M (manual) on slick roads, and when decending long curvy hills. There is nothing I would change on my truck, everything functions perfectly.
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Earl E
Where the RV is parked (formerly OR)
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It works beautifully. You seldom need the M setting if towing. Just put it in Tow mode and the Allison will work for you great. Because there are six speeds it is just too many places to shift by pulling the gear shifter up and down. The M setting lets you do it by pushing a button.
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revrnd
Apsley, Ontario
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I'll be ordering a 6L, so the Allison won't be in the equation.
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NC Hauler
Asheville NC
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revrnd wrote:I'll be ordering a 6L, so the Allison won't be in the equation.
On Edit: I was writing about the D/A and I just noticed that your talking about the 6L gas engine, my bad...don't know that much about the tranny that comes with the 6L engine...sorry about that...
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TomG2
Central Illinois
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Like I said earlier, the GM six speed appears to emulate the Allison transmission. In the Owner's Manual, most instructions are identical.
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nevadanick
Elko, Nevada
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So this transmission behind the gas engine will hold back like an Allison ? I've asked at the local dealers and they dont have the answer.
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