How much torque can a 3.55 ring and pinion take?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by truckerfromatx, Oct 24, 2013.

  1. truckerfromatx

    truckerfromatx Bobtail Member

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    Mar 27, 2011
    Austin, Texas
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    I stopped at a shop in Houston to have the power in my T-600 with a Cummins turned up. He bumped it to 450 hp and 1650 pounds of torque. He said it was the maximum. Do I need to change the gear ratio to a lower or higher number?
     
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  3. DL550CAT

    DL550CAT Road Train Member

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    Its probably the rating of the transmission that they are talking about. No dealer will turn it past that rating.
    You have to go to the aftermarket to get it turned up past the trans rating. I would not let the driveline rating stop me from turning a truck up.
     
    Cetane+ Thanks this.
  4. 062

    062 Road Train Member

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    Never seen ring gear problem, trans yes.my mechanic built twin turbo e model. Put 1402 to roller before input shaft broke.
     
  5. truckerfromatx

    truckerfromatx Bobtail Member

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    Mar 27, 2011
    Austin, Texas
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    Thanks for the info. I guess my mechanic is a firm believer in corporate propaganda.
     
  6. magoo68

    magoo68 Road Train Member

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    or possibly thats as high as that cm will go without major internal modifications
     
  7. Davidlee

    Davidlee Medium Load Member

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    The input shift is usually the one to break.
     
  8. SHO-TYME

    SHO-TYME Road Train Member

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    Liability, if he turns it up over the rating and the trans breaks, who's responsible for the damage? Say for example, you just put that trans in the truck, and it has a warranty, you have it turned up over the rating and it breaks, now the trans warranty people find out it's turned up and void the warranty, who get's blamed, you for telling the mechanic to turn it up or the mechanic who turned it up?
     
  9. truckerfromatx

    truckerfromatx Bobtail Member

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    Mar 27, 2011
    Austin, Texas
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    I should have mentioned that I have a transmission rated at 2050 lbs. of torque. I've gone with the Bully Dog ecu to bump the power.
     
  10. Les2

    Les2 Road Train Member

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    The guy who owns the truck. It's really that simple.
     
  11. Oscar the KW

    Oscar the KW No Filter

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    You're fine, just don't drive like a lunatic and your entire driveline will handle a lot of power.
     
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