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@Dmax Dan I totally agree about the Allison option. Wish they had something made by Allison in our trucks :(

For your truck transmission issues though: have you changed the transmission fluid and how many miles are on your truck? I don't tow much; our 6 x 12 utility trailer is all I tow when I do and it never gets loaded down very heavy at all. I do went with hACKman Customs tunes right at a year ago and at the same time (46k miles) went and changed out the transmission fluid and rear diff fluid with AMSOIL fluids. Didn't have any issues with the transmission before that I recall, but I felt it was time to change fluid. I now have almost 78k miles and still have no issues with either. I plan to change the trans fluid again at 90k (and do the front diff).

Might be worth changing fluid if you haven't, and maybe use a quality fluid too.
GM figures they can't charge enough for the twins to make an Allison happen. That and the HD folks may not want to share. Just throwing that out there.
 

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one of the craziest things is the grade braking, that original trans tuning wants to put the little 4 cyl up to 4k rpm it seems going down a hill. I've gotten to the point where I just leave it in manual mode on big hills because I see no way how pushing it like that helps at all. Not only that if I can gain speed going down hill and not pay for it by using the momentum, then why not? All these things would only become easier with a stick. Not only that but it'd downshift a whole lot less obviously haha
 

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I also agree about the 4WD shifter aswell. I've bumped my knee off the knob a few times now. Its a truck destined for off road. Please give us a floor shifter.
 

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one of the craziest things is the grade braking, that original trans tuning wants to put the little 4 cyl up to 4k rpm it seems going down a hill. I've gotten to the point where I just leave it in manual mode on big hills because I see no way how pushing it like that helps at all. Not only that if I can gain speed going down hill and not pay for it by using the momentum, then why not? All these things would only become easier with a stick. Not only that but it'd downshift a whole lot less obviously haha
It's tune customers universally hated the stock transmission's overly aggressive grade braking logic so much, we asked Green Diesel Engineering to remove it from their trans tune.
 

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Exactly. I've since gotten the GDE trans tune, engine tune and offroad tune as well. Going to do the full deal come spring time after I use up all my DEF and give a little more time in the warranty. As a side note, the austrailian colorado diesel with the 2.8l and 6 speed manual is rated for another 2.5mpg. Its OD ratio is 0.59 as opposed to the auto which is 0.67. Also something else interesting to note, the manual trucks all come with 4.10s. So not only do the manual trucks get better mileage, they also have lower gearing. Go figure. I couldn't believe they lost that much through the 6L50 as opposed to the Eaton FSO2506.
 

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Let me apologize in advanced for my babbling.

i do love my truck how it is and I agree The truck wouldn't feel as sporty with a manual as it does with a tune and an auto with a matching tune. The truck is super sporty and quick right now (engine and trans tuned) No way a manual would shift as smoothly and get up and go as smoothly or as quickly. Truck manuals tend to be more clunky because they have to be strong and first to second is usually an awkward ratio change

But, I didn't buy the truck to be sporty. I bought it to tow with.

Manual would allow me to select the proper gear for towing and eliminate the auto from shifting around on grades and let the turbo and the low end Torque do the work. The auto downshifts for more power but it must have not gotten the memo that all the torque is made down low.

Would also give me peace of mind since my auto runs at over 210° when I tow, I always am concerned for my trans. Shouldn't need to worry about it.

Also, the auto is the weak link, so I'm afraid to make any more power at the motor.

Also, manual would make the exhaust brake really work!
Im gatherin from the comments no one or hardly any one actually knows how to drive a manual.
I can shift under power any deisel manual tran cimbo never touching the clutch except from the stop.

Most gas manual combos can do the same but some are nuts.

My GTO with 501hp at the rear and top speed i can attest to of 195 i took folks in and showed them how its done.

If you want to learn though dont learn in a good vehicle learn in 500 dollar ride that has no clutch like a i did. I drove it chicago to elpaso texas an back that way. Each time i got fuel i had to push it to get it to pop in first by the end ofthe trip i was good enough i passed a cdl with 10 speed having never been in a semi before. Have 3 million miles now and still never used a clutch except from the stop.

No auto will compete when you learn to drive it right and when you put a million miles on your big truck and didnt need valve adjustments or clutch adjustments or changes thats nice too
 

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hate to pick sides, but statistically, manual trans vehicles are involved in less accidents proportional to the amount on the road. it could be argued that many younger, less skilled drivers don't know how to drive a manual trans, but that doesn't change the fact.
Read that manual drivers could tell you more about what happened on the drive and surroundings and what the vehicle was doing ect than auto drivers. I believe it
 

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One great thing about motorcycles, they are manuals. The best thing to happen to bikes is the "quick shifter". It cuts the spark momentarily on upshifts and downshifts to unload the transmission. One can pin the throttle wide open and upshift without the clutch. Goes fast and the staccato sound it makes sounds awesome. The higher end bikes auto blip on downshifts too. Cool stuff there.

I love manuals, but if heavy traffic is involved, they do become a chore. Kinda got over them when I lived in Southern California - the traffic there is insane and the constant stop/go was a chore with a stick. Would love to have the 6 speed stick with the diesel though, now that I am away from California...
 

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One great thing about motorcycles, they are manuals. The best thing to happen to bikes is the "quick shifter". It cuts the spark momentarily on upshifts and downshifts to unload the transmission. One can pin the throttle wide open and upshift without the clutch. Goes fast and the staccato sound it makes sounds awesome. The higher end bikes auto blip on downshifts too. Cool stuff there.

I love manuals, but if heavy traffic is involved, they do become a chore. Kinda got over them when I lived in Southern California - the traffic there is insane and the constant stop/go was a chore with a stick. Would love to have the 6 speed stick with the diesel though, now that I am away from California...
Time for me to Cliffie Clavin again. The best thing about manuals is the added attention to the task at hand. Even though a lot of it is subliminized, you can't phone zone, or day dream. And new manuals are NOT like the 4 speed (unsynchronized granny low), I once had on my '78 F250 4wd crew cab, with the 300 six (4.10 gears). The are silky smooth, a pleasure to use. My brothers and I made sure that kids nieces, nephews, all learned how. Oh, BTW, sticks are borrow resistant. "Oh sure you can. But it's a stick". Since it's becoming a lost art, you get credit for accepting the beg, but usually don't have to execute on it...
 

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Funny thing is, even with the most plain vanilla econbox cars (an old Ford Escort in my wife's case years ago) a stick in 3rd gear with the throttle matted has never failed to entertain, or in the case of that car, at least moderately amuse me :LOL:

We did experience the "borrow resistant" feature too. My wife's friend wanted to borrow the Escort and returned with the keys saying "it's a stick". That is a nice "feature".
 

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In a second... Other then an 87 Grand National in my garage, I have never owned and automatic (been driving since 1978) until I bought my Colorado. I love my truck but I hate an automatic... Give me a choice and I'm there!!!!
 

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GM figures they can't charge enough for the twins to make an Allison happen. That and the HD folks may not want to share. Just throwing that out there.
I wonder what enough would be? They are not exactly giving away 2.8 equipped trucks now, and the interior falls short of the price point IMHO. I do like the 2.8, but the seats dash material, door panels etc kind of cheap trash.
 
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