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If you have a 2020 with the 10 speed. What is your opinion? I'm on the fence on purchasing the new 2020. The old school has always been don't buy the first year of production.
 

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10spd operates seamlessly, rpm drop between gears is very small.
Couldn't be happier with its operation.
Hooked up to the race trailer this weekend, 28' trailer, Dirt Sportsman car, tires, tools, jacks, spare parts. No weight bars felt like a feather back there, cameras turn on with signals in center stack, very nice to tow with.
Can't wait to hook the 5th wheel, ISR adapter for the hitch being shipped on the 15th.
 
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I am happy with the 10 speed as well. I had some surging going from 2nd to 3rd early on, but it smoothed out aftera few hundred miles. Love the way it pulls the toy hauler.
 

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I am happy with the 10 speed as well. I had some surging going from 2nd to 3rd early on, but it smoothed out aftera few hundred miles. Love the way it pulls the toy hauler.
That was most likely the xmsn "learning" how you drive. As for me, Id LOVE to have the 10 speed, MUCH easier to stay in the desired RPM range.
 

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Count me in the same group as the others. The 10 speed has been great to drive with. And mine is still learning, so it's getting better and better each time.

Shifts are hardly noticeable and it's smooth as silk!
 

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I was sent thru e-mail a survey in regards to my 2020 GMC 3500. One of the questions was "What do you like most about your 2020 GMC 3500?" I responded, "The transmission" This is hands down the best transmission I have ever had in a HD truck. I just came from an Aisin trans in a Ram 3500 and this 10 speed is so much better in every way. A pleasure to drive.
 

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I echo these statements.... I was skeptical, but so far the trans is seem less. Always seems to be in the right gear and have all the power available. Haven't pulled our toy hauler yet... gonna try that this weekend. 18k lbs loaded should give it a good test.
 
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And thank gm/allison for the valvebody work
 

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Looks like ya'll can thank Ford for the 10 speeds ya'll are loving so much 🤣😂
Good lord, why does everyone think that since Ford and GM collaborated on a 10 speed for 1/2 ton trucks that this is the same one they put in the HDs?

Do you really think the trans they're using in the half ton is capable of standing up to 945 lbs*ft of torque pulling 35,500 lbs of trailer with no torque management? Heck, the last Allison wouldn't even do that.

The 10 spd "Allison" has NOTHING in common with the Ford/GM 10 spd. NOTHING - except maybe the fact that they are both 10 speeds.

There's a video where the engineer who was in charge of developing the new Allison CLEARLY states this. I'll see if I can find it again.



I test drove a 2020 last week. I only drove it about 10 miles and I wasn't just completely zeroed-in on the trans, but I never even felt the thing shift. Not once. Muuuuuch smoother than my old 5 speed. I was really impressed with the truck. VERY impressed.

Having said all that, I am waiting for at least the '21s. Between the new body, frame, trans etc. I just decided that I'd wait at least a year for bugs to show up and be fixed. Ideally I'd wait for a 22 or so but at least with this truck, the motor is 3+ years old. My 2002 was the second year of production for the duramax and I've been absolutely hammered by injector problems. Not anxious to repeat something like that.
 
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There's a video where the engineer who was in charge of developing the new Allison CLEARLY states this. I'll see if I can find it again.
1/2-ton 10spd is different from the HD 10-spd.....which was also a collaborative effort with Fjord, sharing the cost of development....with some input from Allison.

IIRC, It (10L-1000) is built in the GM plant in Flint though.

Edit....for some tasty input. :laugh:

GM couldn't make up their mind if they were going to use the 9 speed Alli or something else. The 9 speed is shelved over at Allison and don't know what they are going to use it for. I think GM and Ford decided on the 10 speed that they built together and just made it twice as big. Ford took the lead on this development and my buddy at Allison changed the valve body to his specs.
So far it looks like TCM tuning is going to play a big part for this trans. A new pump and valvebody might be a big part of every build. Too soon to tell. I just ordered a stand for mounting this monster.
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Mike L has one of the 2020 transmissions it is a ford built unit he has said so in multiple threads and so have other very reputable transmissions builders. The only thing allison/gm did was the valve body
 
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