2020 allison 10spd - Chevy and GMC Duramax Diesel Forum
2017+ L5P Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 25 (permalink) Old 06-15-2019, 11:57 PM Thread Starter
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2020 allison 10spd

Can anyone tell me the gear ratios on the new allison (built by GM) 10 spd tranny? The ones going in the 2500 and 3500 HD duramax trucks

2002 Silverado 3500 lb7 4wd 200K
Knapheide service body
Airdog 2 165
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post #2 of 25 (permalink) Old 06-16-2019, 02:53 AM
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I am pretty sure this have been covered in the 2020 thread.

Search is your friend.

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post #3 of 25 (permalink) Old 06-16-2019, 04:41 AM
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Transmission:
10-speed 10LXX
Gear ratios (:1)
First:
4.70
Second:
2.99
Third:
2.15
Fourth:
1.80
Fifth:
1.52
Sixth:
1.28
Seventh:
1.00
Eighth:
0.85
Ninth:
0.69
Tenth:
0.64
Reverse:
4.87

09 GMC SLT Dually
Steel Gray Metallic
All options except sunroof

Mods so far:

Alcoa 19.5s with Michelin XZE, Centramatics,Tow Mirrors, Chrome Grill Overlay, Rear underseat storage, Mudflaps all corners, 20% Window tint, 6" Oval Steps, B&W Turnover Hitch, B&W Companion Hitch, Sulastics, GM Campaign #PIT3009J, Wireless Console Charging, Bilstein 5100s, Raptor 3602RL
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post #4 of 25 (permalink) Old 06-16-2019, 04:56 AM
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That is interesting about the10 speed. I am curious now what the similar ratios are on a L5P series 6 speed. Does anyone have those numbers

2018 Duramax GMC 2500
2006 VW Jetta TDI
2000 VW New Beetle TDI Retired after deer hit
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post #5 of 25 (permalink) Old 06-16-2019, 05:21 AM
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https://media.chevrolet.com/media/us...o-hd-2020.html

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2018 Chevy Silverado 3500HD LT.
2007.5 Chevy Silverado 2500HD LT. Anarchy tune running on +50hp. 4" MBRP quiet tone exhaust. EGR fell out after being almost 100% plugged (Traded).
2004.5, 2007.5, 2015 Ram Cummins (Traded).
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post #6 of 25 (permalink) Old 06-16-2019, 07:16 AM
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Quote:
Originally Posted by JimmyD View Post
Transmission:
10-speed 10LXX
Gear ratios (:1)
First:
4.70
Second:
2.99
Third:
2.15
Fourth:
1.80
Fifth:
1.52
Sixth:
1.28
Seventh:
1.00
Eighth:
0.85
Ninth:
0.69
Tenth:
0.64
Reverse:
4.87
This is a little different than what GMC has posted right now under Transmission and Axles under the 2020s. Here is what I found:
ALLISON 10-SPEED AUTOMATIC TRANSMISSION (6.6L DIESEL)
GEAR RATIOS (:1)
10L1000
FIRST GEAR
4.54
SECOND GEAR
2.87
THIRD GEAR
2.06
FOURTH GEAR
1.72
FIFTH GEAR
1.48
SIXTH GEAR
1.26
SEVENTH GEAR
1.00
EIGHTH GEAR
0.85
NINTH GEAR
0.69
TENTH
0.63
REVERSE
3.06
4.54
AXLE RATIO
3.42
REAR AXLE RING GEAR SIZE
11.5 in.
https://www.gmc.com/trucks/sierra-at...y-pickup-truck

2007 GMC Sierra Vortec Max
Future owner of a 2020 GMC AT4 2500 Duramax
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post #7 of 25 (permalink) Old 06-16-2019, 10:56 AM Thread Starter
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Thanks i read Allison is building the 10 spds for the 4500 and up trucks, but GM is building the 10 spd for the 2500 and 3500 hd trucks. Perhaps this is the descrepancy??

2002 Silverado 3500 lb7 4wd 200K
Knapheide service body
Airdog 2 165
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post #8 of 25 (permalink) Old 06-16-2019, 10:00 PM
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The 4.70, 2.99, 2.15, 1.80 are the low gear ratios for the 10 speed are the 1500, the 10L90

The Allison ratios are as silentfun65 posted - trans is known as 10L1000



GM press release: https://media.chevrolet.com/media/us...o-hd-2020.html

Includes a chart with the ratios for both the 10L1000 and the 6L90.

2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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post #9 of 25 (permalink) Old 06-17-2019, 05:05 AM
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Quote:
Originally Posted by Fastshivy View Post
Thanks i read Allison is building the 10 spds for the 4500 and up trucks, but GM is building the 10 spd for the 2500 and 3500 hd trucks. Perhaps this is the descrepancy??
The 4500 and up true medium duty trucks will continue to use real Allison sourced 6 speeds transmissions instead of the Allison labeled 10 speed.

2018 2500HD Denali
sold: 2006 Sierra 2500HD LBZ, 2001 Sierra 2500HD LB7
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post #10 of 25 (permalink) Old 06-17-2019, 09:30 AM
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The 4500/5500/6500 world is much different than the 2500/3500 one.

4500/5500/6500 transmission options: (with GM rpos and Allison model numbers, from https://www.gmfleetorderguide.com/NA...page=6&butID=3)

MWA Highway Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A1700HS, ratios: 3.10 1ST, 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Highway Series, 19.5K GVW & 26K GCW Max., requires PTX and park pawl. Available with GVWs less than or equal to 19.5K

MJ0 Highway Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A1750HS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Highway Series, 19.5K GVW & 30K GCW Max., requires PTX and park pawl. Available with GVWs less than or equal to 19.5K


MWB Highway Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A2700HS, ratios: 3.10 1ST,1.80 2ND,1.40 3RD,1.00 4TH,0.70 5TH,0.61 6TH Highway Series, 26K GVW & 26K GCW Max., requires PTX and park pawl, Available with GVWs greater than 19.5K

MBX NEW! Highway Service Transmission Automatic close-ratio 6 SPD with double overdrive, Allison, A2750HS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Highway Series, 26K GVW & 37K GCW Max., Requires PTX, Includes park pawl . Available with GVWs greater than 19.5K

MIU Rugged Duty Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A1700RDS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Rugged Duty Series, 19.5K GVW & 26K GCW Max., requires PTO and park pawl, On/Off Highway. Available with GVWs less than or equal to 19.5K

MI0 Rugged Duty Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A1750RDS, ratios 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 Rugged Duty Series, 19.5K GVW & 30K GCW Max., requires PTO and park pawl, On/Off Highway. Available with GVWs less than or equal to 19.5K

MIA Rugged Duty Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A2700RDS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Rugged Duty Series, 26K GVW & 26K GCW Max., requires PTO and park pawl, On/Off Highway. Available with GVWs greater than 19.5K

MBV NEW! Rugged Duty Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A2750RDS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Rugged Duty Series, 26K GVW & 37K GCW Max., Requires PTO, Includes park pawl, On/Off Highway. Available with GVWs greater than 19.5K

MH1 Emergency Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A1700EVS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Emergency Vehicle Series, 19.5K GVW & 26K GCW Max., requires PTO and park pawl. Available with GVWs less than or equal to 19.5K

MHV Emergency Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A1750EVS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Emergency Vehicle Series, 19.5K GVW & 30K GCW Max., requires PTO and park pawl. Available with GVWs less than or equal to 19.5K

MG0 Emergency Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Alison, A2700EVS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH, Emergency Vehicle Series, 26K GVW & 26K GCW Max., requires PTO and park pawl. Available with GVWs greater than 19.5K

MBY NEW! Emergency Service Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A2750EVS, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Emergency Vehicle Series, 26K GVW & 37K GCW Max. Close-ratio with double overdrive. Includes PTO and park pawl. Available with GVWs greater than 19.5K

ME0 Motor Home Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A1750MH, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Motorhome Series, 22K GVW & 30K GCW Max., requires PTO and park pawl. Available with GVWs less than or equal to 22K

MIX Motor Home Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A1700MH, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Motorhome Series, 22K GVW & 26,001 GCW Max., requires PTO and park pawl. Available with GVWs less than or equal to 22K

MF0 Motor Home Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A2700MH, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Motorhome Series, 26K GVW & 26,001K GCW Max., requires PTO and park pawl. Available with GVWs greater than 22K

MBW NEW! Motor Home Transmission, Automatic close-ratio 6 SPD with double overdrive, Allison, A2750MH, ratios: 3.10 1ST 1.80 2ND, 1.40 3RD, 1.00 4TH, 0.70 5TH, 0.61 6TH Motorhome Series, 26K GVW & 37K GCW Max. Close-ratio with double overdrive. Requires PTO and includes park pawl. Available with GVWs greater than 22k

2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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