Allison PTO gear ratio

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Rockhound11, Feb 15, 2025.

  1. Feb 15, 2025 #1
    Rockhound11

    Rockhound11 Bobtail Member

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    Feb 15, 2025
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    Does anyone know how many teeth are on the pto drive gear in an allison 3000rds? Right side 10 bolt provision. I'm trying to add a pto and hydraulic pump, but can't find anything that will let me calculate the ratio from engine rpms to the pto, to size up the correct pump. The pto I'm looking to install has an internal ratio of 29/35, but i assume the transmission to pto isn't a 1:1 ratio.
     
    Rockhound11, Feb 15, 2025
    Rockhound11, Feb 15, 2025
    #1
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  3. Feb 15, 2025 #2
    Ridgeline

    Ridgeline Road Train Member

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    GO to the link below, look at the lit for the a20/a30 PTO, there are no 1:1 ratio, it goes from .54:1 to 1.34:1

    I would also recommend looking at the pumps they have. If you have questions, you can call Muncie and they can tell you what you can use down to the part number.

    Allison 3000-4000 PTOs
     
    Ridgeline, Feb 15, 2025
    Ridgeline, Feb 15, 2025
    #2
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