Towing up grades with "M" and 1 gears
So I have several coaches, but this will be my first attempt pulling a TT up a steeper mountain grade. I'm towing with a 1 ton Chevy express 3500. I'm a bit "confused" on just how to use this tra...
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M mode for GM is not quite manual. It is more like range limit for the top gears. The number displayed is the highest gear the transmission will automatically shift into.
I tow in M4 or M5 with Tow/Haul enabled depending on the situation. Same engine/transmission as your van. I tow around 70mph and have had the trans shift into 6th gear. There is not enough torque at 2000rpm to push through the air. So, speed drops, then double downshift to get back to target speed. I lose the grade braking feature in M mode, but I can do that myself by hitting '-'. That engine/trans can sing at 3000rpm for 300k miles.
I tow in M4 or M5 with Tow/Haul enabled depending on the situation. Same engine/transmission as your van. I tow around 70mph and have had the trans shift into 6th gear. There is not enough torque at 2000rpm to push through the air. So, speed drops, then double downshift to get back to target speed. I lose the grade braking feature in M mode, but I can do that myself by hitting '-'. That engine/trans can sing at 3000rpm for 300k miles.
