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Allison Transmission Ratios

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  • Allison Transmission Ratios

    Here are the gear ratios for all of the Allison Transmissions that came in the GM 3/4 ton and 1 ton trucks. The 5 and six speed transmission have the same ratios in gears 1-5, if you are doing a 6 speed conversion on your 2001-2005 transmission you will have the same gearing as the 6 speed transmissions for the 2007-2019 trucks.
    Allison 1000 & 10L1000 Ratios
    1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th
    2001-2005 3.094:1 1.809:1 1.406:1 1.00:1 0.711:1 N/A N/A N/A N/A N/A
    2006-2019 3.094:1 1.809:1 1.406:1 1.00:1 0.711:1 0.614:1 N/A N/A N/A N/A
    2020+ 4.54:1 2.87:1 2.06:1 1.72:1 1.48:1 1.26:1 1.00:1 0.85:1 0.69:1 0.63:1

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