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Why does the 460le have a lower 1st gear then the 480le?

Discussion in 'The Garage' started by COCHEV, Mar 9, 2004.

  1. COCHEV

    COCHEV 1/2 ton status

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    my new work rig has a 480le and 4.10s. my old burb had a 460le and 3.42s. i'm sure my burb would take my new truck off the line. don't see why gm wouldn't have given the 480le a low 1st too. anyone know the reasoning behind this?
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    4L60E is based on the 700R4/4L60 (3.06:1)

    4L80E is based on the TH 400 which has a 2.48:1 1st gear
     
  3. COCHEV

    COCHEV 1/2 ton status

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    [ QUOTE ]
    4L60E is based on the 700R4/4L60 (3.06:1)

    4L80E is based on the TH 400 which has a 2.48:1 1st gear

    [/ QUOTE ]

    i realize that, i'm just wondering about the rational behind it. doesn't seem right for the heavy duty trannie to have the taller 1st and 2nd. maybe behind a big block it evens out, but behind a sb350 it seems like a mistake.
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Average 1/2 ton has 3.42 or 3.73.

    Average 1 ton has 4.10s. /forums/images/graemlins/thumb.gif
     
  5. sled_dog

    sled_dog 1 ton status

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    also that transmission is meant to have a big block or diesel in front of it. Torque converter in that sucker is huge. I had a 95 K2500 with 350/4l80E. 4.10 gears it was still a dog. Going to look at a 97 3/4 ton tonight, probably has the 4l80e but thats a Vortec motor so hopefully its alright.
     
  6. COCHEV

    COCHEV 1/2 ton status

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    mine is a 95 also. love the truck, but in about a year i'll trade up for a duramax crew cab. just couldn't hack the $600 a month payment this year. /forums/images/graemlins/shocked.gif
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Would have cost them more money to redesign the whole thing as opposed to just figuring out how to add OD.
     
  8. hardcore71

    hardcore71 Registered Member

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    The more gear reduction in a trans = less ultimate torque it can withstand. Gear reduction=torque increase by the same amount. The more gear reduction, the more torque the output section of the trans has to withstand.
    By the way, all 96-up (at least) 3/4 ton (8600 GVW) trucks had 4L80E's and the 5.7's had less compression than the 1/2 tons. 8.something vs 9.4:1 even though they were rated the same hp (haha)
     

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