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Torque converter slip

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by AussieK5, Jul 10, 2006.

  1. AussieK5

    AussieK5 1/2 ton status

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    Ive googled without luck. Anyone know what % of slip the 350/700 trans have at cruisin speed?
    TIA
    Jason
     
  2. ntsqd

    ntsqd 1/2 ton status

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    The figure I've always heard is 2%-5% depending on the stall speed of the converter. In OD with the conveter locked up there would be no slippage.

    If a guy really wanted to know, and you have VSS, you could config a "tachometer" to read that signal and compare it to and engine tach.
     
  3. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    A 700 will be locked up in 2nd, 3rd and O/D at light (cruise) throttle. I know not the slippage on a 350 but it will vary greatly on the build of the converter.
     
  4. AussieK5

    AussieK5 1/2 ton status

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    Thanks....I've heard that its about 5% for a stock converter, though I am still hoping to get some empirical data before I move ahead.

    I plan on running a 350 or maybe a non-lock up 700 and want to target a good rpm range with my final drive ratio at highway speed.

    Jason
     
  5. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    I believe that 700s are prone to overheating when run without a lock-up. just what I've read, not what I've experienced.
     
  6. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    Any auto will make a little more heat with the TC unlocked than it will with the TC locked. No big deal, and if you need to run it down in D (instead of up in OD), due to towing a heavy trailer, steep hills, or something like that, just keep an eye on the trans temp gauge, and install a bigger trans cooler if temps indicate that to be a good idea.
     

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