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GM Gassers Discuss the GM 5.3L, 5.7L, 6.0L & 8.1L gas engines & associated components.


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Old 02-03-2019, 09:07 PM   #1 (permalink)
mpjman
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6.0 Manual gear

Recently bought an 08 suburban and today i got to drive around and play with it. I noticed two things but cant really find any info on it online.

First is the tow haul mode button. I have this on my 05 duramax and it works great but today when i was descending a hill with no load in my 6.0 urban, it seemed very different than how it works on my silverado. I was doing 45 mph down a 40 percent grade. I turned on the tow haul button and the vehicle immediately a hard deceleration and the RPM's jumped up to like 4k. Is that normal? On my drama it never jumped the RPM that high


Second question
The truck has a M gear in place of the usual 3,2,1 gears. When i shifted into that it was on 4. I used the arrow and dropped it to 3 and it slowed me harder, then 2 etc. Is that whats its for? and does it do any damage to the truck or trans?

Which is better for grade braking on a hill?


Thanks all

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Old 02-04-2019, 08:22 AM   #2 (permalink)
johnH123
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The tow/haul is different on the gassers because the gas needs higher RPM to make torque, so the shift points are set up so that the engine has an easier time getting there.

On my 01 silverado, T/H doesn't do any downshifting for engine braking. On my dads '12, when you hit the brakes in t/h it downshifts. yours is later than my truck so i don't know when they started with the engine braking.

I wouldn't even push the t/h button unless i was towing/hauling. Just use the manual mode for downshifting during regular driving. Place the lever in the M position, and use the +/- button to select a gear range (1, 1-2, 1-3, 1-4). basically it just allows you to manually select gear ranges. Just don't downshift to much or you'll over-rev the engine and don't downshift multiple gears at once. The number next to the M in manual mode is the selected gear range.

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