Engineer9860
Eagle Scout dad
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Joined: 08/10/2003
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I looked at a truck today, 2008 Chevy 2500HD RC/LB Z-71. One sweet rig. 
Windshield priced at 22,000, and change.  My 2500HD similarly equipped 6 years ago was 24,000 and change. 6 years have passed and the price of new trucks drop $2,000. Man, it must be true that these things are overpriced.
Anyway rant over.
Now to my question:
How does the "manual" mode work on the 6L90E transmission?
If I am at a dead stop, and manually select 2nd gear will the transmission shift into second and hold it until I select another gear after I start rolling?
Would someone with experience with the newer GM autos explain to me how the "tap shift" feature works?
2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L80E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454
30 year student of the Boeing B-17 Flying Fortress
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reno82
Cardiff by the Sea, CA
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It works great..... Yes it will hold whichever gear you select, it will not shift down to a lower gear if the revs would be too high, but will wait till it is safe and shift down. It's fun to use both climbing and descending, but in TH mode the tranny will shift down every time you touch the brakes and shift up when you touch the gas so manual doesn't get much use.
P.S. at a dead stop if you select 2nd it will start in 1st and not go higher than second, or whatever you set as the limit, it will not start in the higher gear if that's what you ment.
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Rollincool
Always Rollin
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If you start in "M" you will HAVE to manually shift up FROM first gear.
It will NOT come out of first gear automatically in "M".
Now, it WILL downshift automatically when in "M", but from whatever gear you ended at.
The 6L90 also has the grade braking feature like the allison.
If you're use to the 4L80, the 6 speed takes a bit of getting used to.
One more note... Go for the 3500. You'll get a BETTER deal than a 2500 because the advertising is cheaper than the 2500's.
My 3500 cost me 5 grand cheaper than a lesser equipped 2500.
2008 Chevy Silverado 4x4 3500 RC/LB 6.0
2007 Chevy GS Conquest Super C 6340DK
2007 Chevy HHR Toad 2LT 2.4
1990 Chevy G20 Cargo Van 305
1967 Chevy Camaro Pro Street 468/650hp BBC 
My 70's Show - Tom Kent Radio Network - KLTH - K•HiTS 106.7
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reno82
Cardiff by the Sea, CA
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Rollincool wrote:If you start in "M" you will HAVE to manually shift up FROM first gear.
It will NOT come out of first gear automatically in "M".
Now, it WILL downshift automatically when in "M", but from whatever gear you ended at.
The 6L90 also has the grade braking feature like the allison.
If you're use to the 4L80, the 6 speed takes a bit of getting used to.
One more note... Go for the 3500. You'll get a BETTER deal than a 2500 because the advertising is cheaper than the 2500's.
My 3500 cost me 5 grand cheaper than a lesser equipped 2500.
Start in "M" what? Yes if you start in M1 it will not shift out, if you start in M3 it will start in 1st and go up to 3rd where it will stay, if you start in M5 it will go through all the gears till 5th automatically, but will not go to 6th (2nd overdrive) There is no plain "M" unless you don't tell it which gear you want, in which case it uses the gear you're in as your choice, it's "M" plus whatever you set with the + or - button or whatever gear your in when shifting to "M". If you're already stopped that would be M1.
* This post was
edited 08/05/08 08:34pm by reno82 *
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Rollincool
Always Rollin
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reno82 wrote:Start in "M" what? Yes if you start in M1 it will not shift out, if you start in M3 it will start in 1st and go up to 3rd where it will stay, if you start in M5 it will go through all the gears till 5th automatically, but will not go to 6th (2nd overdrive) There is no plain "M" unless you don't tell it which gear you want, in which case it uses the gear your in as your choice it's "M" plus whatever you set with the + or - button or whatever gear your in when shifting to "M". If you're already stopped that would be M1.
Why would select "M" and start out in 3rd? If you put the selector in "M" from a dead stop the computer tells the trans you're in first gear.
That's what I was explaining. Of course it's "M1" because the selector is in "M".
Don't need a college degree to figure that out.
What is the reason for a manual shift up if you're going to start out in 3rd and let the computer do the shifting. Seems kinda ridiculous to do that. Might as well just leave the selector in "D" and let the computer do the work.
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reno82
Cardiff by the Sea, CA
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It doesn't take a college degree to figure the answer to that. Maybe you're stopped at the base of a hill with a short flat stretch before you start climbing, you want to climb the hill in 3rd and don't want the tranny shifting past 3rd as you build up some speed then have to downshift, you set the tranny at M3. Maybe you're in stop and go traffic and don't want the truck to go out of 2nd, you put the tranny in M2 and leave it there. Maybe you're stopped at the top of a long decent and want to limit the tranny to 3rd, why start in M1 and have to hit the + button twice as you build up speed? Put it in M3 and let it go. There are plenty of reasons, just because you can't figure it out doesn't mean you have to be condescending in your answers.
P.S. beside the fact the original poster asked about starting out in M2 so it appears he may want to know how it works despite the fact you feel it's foolish.
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Rollincool
Always Rollin
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reno82 wrote:There are plenty of reasons, just because you can't figure it out doesn't mean you have to be condescending in your answers. 
I'm not being condescending. You're just insignificant. 
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reno82
Cardiff by the Sea, CA
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Coming from someone who feels so strongly about Chevy vs Ford to put it in their profile, I find that a compliment. I bet you even have a little Calvin pissing on a Ford emblem on your truck. Talk with me again when you grow up.
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Turbo Diesel Dude
Green Mountain, NC
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Does that mean "R" is for race?
charles weidman
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Engineer9860
Eagle Scout dad
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Let me ask my question a different way....
If I am sitting stopped, and I select M2 will the truck take off in 2nd gear, or will it take off in first, then shift to 2nd, and hold 2nd?
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