Does DIC show current gear when in manual mode?

gearheadesw · June 7, 2017

L or M, they just show the gears you've locked out to but no live indicator of what gear you are in unless you are hitting the + or - as you drive directly. So, if you put it in L or M, and leave it in L5 or M5, you get gears 1 through 5 but no indication of what gears you are in as you drive.

1500, 2500, 3500, all the same. Even the 8 speed. The GMT-900 trucks were the same way with the 6L80/90 transmissions as well.

This. I was banging gears in M mode.

My 16 regular cab work truck has, P R N D M 1, on the gear shit pattern indicator, 1 is just that first gear only, no shifting.

Big Whiskey · June 9, 2017

Not sure on the M to L change. Just about every other GM made that change as well, and I think the first ones to have L instead of M all together were the Lambda trio (Traverse/Acadia/Enclave) back at their launch in 2007.

As for the gear dropping...It started with the K2 products for trucks. The GMT-900's where set up like the 6 speed Allisons were in 2006 when they launched. You went to "range selection mode" and if you were doing 60mph in 6th gear, it would display M6 and stay in 6th. It may be a "performance" related reason? As in, GM thinks if anyone is looking to go into M/L they are wanting a fast downshift to pass or something? Kinda pulling at straws there but it sort of makes sense to me.

I can't copy the chart over, but on the chart this is how it's set up:

Drive Gear before/after shifting to M/L:

D 6th - goes to M/L 4th

D 5th - goes to M/L 4th

D 4th - goes to M/L 3rd

D 3rd - goes to M/L 2nd

D 2nd - goes to M/L 2nd

D 1st - goes to M/L 1st

This came from the online copy of the owners manual for a 2017 Silverado.

Good post. Thank you!

rocnrol · June 9, 2017

This. I was banging gears in M mode.

My 16 regular cab work truck has, P R N D M 1, on the gear shit pattern indicator, 1 is just that first gear only, no shifting.

This is not true of the 1 selection. Shifting into 1 while at any speed will put the truck into a kind of "hyper mode" of grade braking. Especially useful in a gas engine truck. It will use a combination of gearing and braking to hold the speed the truck was at when 1 was selected. It works amazingly well

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gearheadesw · June 9, 2017

This is not true of the 1 selection. Shifting into 1 while at any speed will put the truck into a kind of "hyper mode" of grade braking. Especially useful in a gas engine truck. It will use a combination of gearing and braking to hold the speed the truck was at when 1 was selected. It works amazingly well

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Really, excellent advice. I had no idea, thanks @rocnrol. I had only put it in that gear selecti off road, and no real hills in Florida, so no test grounds close.

rocnrol · June 9, 2017

Really, excellent advice. I had no idea, thanks @rocnrol. I had only put it in that gear selecti off road, and no real hills in Florida, so no test grounds close.

Yup....going through the mountains with the trailer on, for the most part the "normal" grade braking does a good job on the down hill, but on the steeper ones, throw down into that one position and you'll be tapping your brakes maybe a couple of times

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