KTA Cummins and transmission torque rating

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Jun 13, 2021.

  1. mile marker 27

    mile marker 27 Medium Load Member

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    Always on the lookout for a KT or KTA Cummins. I really like my 13 speeds so, just wondering what torque rating for 13 would be necessary for 525-600hp KTA? My current N14 has a 1,500 torque rating.
     
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  3. beastr123

    beastr123 Road Train Member

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    A stock KTA 600 is rated at 1650. Tuned I have seen them produce up to 2000 easily.
     
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  4. Roger McG

    Roger McG Light Load Member

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    Keep in mind that when the KT and KTA Cummins were the hot set setup a 125 transmission was the heavy duty ones. And they seemed to stay together, closed case no coolers
     
  5. beastr123

    beastr123 Road Train Member

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    In the mid to late 90s many KT and 3408 engines were picked up on the west coast from CA to BC by a group of Aussies who shipped container loads to their operations down under where they built road train tractors.
     
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  6. beastr123

    beastr123 Road Train Member

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    Most western trucks in the late 80s and 90s running KT and 3408 engines ran 15 speeds or 5X4 or 6X4 transmission sets to run mountainous country.
     
  7. beastr123

    beastr123 Road Train Member

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    Yes they were mostly in older trucks when I came across them in the late 80s when I started running the wet coast instead of the midwest.
     
  8. haycarter

    haycarter Road Train Member

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    Plenty of K series were sold here right up until the late 90's... in fact you can still buy a New Kenworth Fitted with one.

    C510 - Kenworth Australia

    C540 - Kenworth Australia
     
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  9. Brettj3876

    Brettj3876 Road Train Member

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    14613 too. Lots of big power back then was behind those 2. I like the feel of how they shift compared to the RTLO. Ours will run about 190 on a hot day.
     
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  10. mile marker 27

    mile marker 27 Medium Load Member

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    The 15 is a good transmission, but there’s several duplicate gears between deep reduction and low. I really like to be able to split my high side, so a higher torque rated 13 or 18 speed, would be my choice. I’ve never understood the love for the 15 compared to a 13 or 13DO.
     
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  11. Brettj3876

    Brettj3876 Road Train Member

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    The deep reduction on the low side. If i had a choice I'd take an 8LL over a 15
     
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