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Thread: Is this normal RPM...
          
   
   

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  1. 08-02-2007 12:40 PM #1
    Madman's Avatar
    Madman
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    Is this normal RPM...

     



    RPM range for a 455 pontiac with a T-400 and 3.07 gears to turn 3200 RPM at 60 mph? This is with a 29" tall tire. This combination is in a 48 Chevy Sedan delivery.

    A buddy of mine is having a dilemma about this. His Tranny guy is telling him that the RPM range is acceptable for the combination. But he really doesn't like turning the motor that high on the Interstate. He is also concerned about the cost (and reliability)of changing to a 700 R-4.


    Thanks in advance for the help.

    Chris
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  3. 08-02-2007 12:53 PM #2
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    Those are 4.11 gears or the torque converter is slipping bad...........
    4.11 , 1 to 1 in drive with a 29 inch tire should be......
    4.11 gears
    Engine Speed (RPM) Speed (MPH)
    8000 RPM 167.93 MPH
    7500 RPM 157.44 MPH
    7000 RPM 146.94 MPH
    6500 RPM 136.44 MPH
    6000 RPM 125.95 MPH
    5500 RPM 115.45 MPH
    5000 RPM 104.96 MPH
    4500 RPM 94.46 MPH
    4000 RPM 83.97 MPH
    3500 RPM 73.47 MPH
    3000 RPM 62.97 MPH
    2500 RPM 52.48 MPH
    2000 RPM 41.98 MPH
    1500 RPM 31.49 MPH
    1000 RPM 20.99 MPH
    This is what the 3.08 should be......


    Engine Speed (RPM) Speed (MPH)
    8000 RPM 224.09 MPH
    7500 RPM 210.09 MPH
    7000 RPM 196.08 MPH
    6500 RPM 182.07 MPH
    6000 RPM 168.07 MPH
    5500 RPM 154.06 MPH
    5000 RPM 140.06 MPH
    4500 RPM 126.05 MPH
    4000 RPM 112.05 MPH
    3500 RPM 98.04 MPH
    3000 RPM 84.03 MPH
    2500 RPM 70.03 MPH
    2000 RPM 56.02 MPH
    1500 RPM 42.02 MPH
    1000 RPM 28.01 MPH
    This is with a 4.56 rear gear ,this looks the closest to the rpm he is turning


    Engine Speed (RPM) Speed (MPH)
    8000 RPM 151.36 MPH
    7500 RPM 141.90 MPH
    7000 RPM 132.44 MPH
    6500 RPM 122.98 MPH
    6000 RPM 113.52 MPH
    5500 RPM 104.06 MPH
    5000 RPM 94.60 MPH
    4500 RPM 85.14 MPH
    4000 RPM 75.68 MPH
    3500 RPM 66.22 MPH
    3000 RPM 56.76 MPH
    2500 RPM 47.30 MPH
    2000 RPM 37.84 MPH
    1500 RPM 28.38 MPH
    1000 RPM 18.92 MPH
    Its gunna take longer than u thought and its gunna cost more too(plan ahead!)
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  4. 08-02-2007 01:00 PM #3
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    Madman
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    Thanks Shawnlee. I will pass this on to him.

    It sounded really weird to me when he told me what RPM he was turning.
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  5. 08-02-2007 01:58 PM #4
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    Mines a 383 TH350 with 410s and 26" tires-- Thats about where its at I agree with Shawnlee
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  6. 08-02-2007 02:09 PM #5
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    Yup... something doesn't add up... I'm running 4.56:1 with 31" tire ~65-70 at 3200-3400rpm
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