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Tires size messing with the Alsion Trans?

Discussion in '1992-Present Chevy & GMC models' started by aksidentproan, Nov 17, 2003.

  1. aksidentproan

    aksidentproan 1/2 ton status

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    My Boss has a 2002 4 Door Cab, short bed 2500HD Duramax/Alison and would like to put a set of 285/75 BFG All-Terrains on it before winter. A mechanic at a shop told him that the larger tire size can somehow cause damage to the Alison or cause it to shift poorly. I'm thinking a speedometer calibrator(tru-speed) would be the solution to this problem. Anyone have any insight or experience with this. Any info is greatly appriciatied. Thanks.

    Evan
     
  2. HarryH3

    HarryH3 1 ton status Author

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    Drop a PM to Toby (username moneypit). He's got an '03 Duramax with 315/75R16's. He has an aftermarket computer that changes the parameters for the engine and the tranny. That truck will give Camaros and Mustangs a run for their money! /forums/images/graemlins/eek.gif
     
  3. Confedneck

    Confedneck 3/4 ton status

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    the technician at the shop wasnt lying, on computer controlled transmissions, if you up the tire size without changing the gears in the differentials, the computer controlled TCL(torque convertor lockup) will be inefficient and will lock and unlock unnecessarily so a recalibration of the transmission controller for TCL or whatever its called by GM would solve that problem..
     
  4. aksidentproan

    aksidentproan 1/2 ton status

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    What kind of programmer would you all recomend? Would any engine programmer be able to reprogram for the tires? Thanks.

    Evan
     
  5. Confedneck

    Confedneck 3/4 ton status

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    hypertech makes a good product..
     
  6. Blazer1970

    Blazer1970 1/2 ton status

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    Tons of people run 285s on these trucks with no problems whatsoever. GM did issue a bulletin saying that you if you come in with a tranny issue (warrantee) you will have to swap back to stock size tires before they will try to diagnose, so he would need to keep that in mind.
     

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