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sm465 what gears?

Discussion in 'The Garage' started by nicotine, Feb 7, 2004.

  1. nicotine

    nicotine 1/2 ton status

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    okay i have a sm465 tranny and i am currently running 33's and will be steping up to 35 soon what would be a good difrential gear ratio with this setup? i currently have 3.08 they are tall but i could imagine running 4.11 with this setup and how much and how quickly the engine would be winding out even on highway driving. /forums/images/graemlins/yikes.gif
     
  2. u2slow

    u2slow 1/2 ton status

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    I had 33's and 4.10's with 350/SM465. Was cruising at 65mph doing 3000rpm. OD would have been nice. Also have to factor in a 1-2 hour minimum highway drive to get to most of the wheelin' spots around here. It was plenty of gearing even with the truck weighing a hefty 7700lbs.

    I'd stick with 4.10 even with 35's. 38/39's will warrant more gearing, but at that point I'd rather add an extra t-case than re-gear two perfectly good axles. /forums/images/graemlins/thinking.gif
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I ran 35's and 3.73's with my SM465. Then 36's with the same gears and it was fine...and relatively sane on the freeway.

    Recently went to 4.56's and 39.5's (and diesel) and I could use an overdrive.

    Rene
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    I'd stick with 4.10 even with 35's. 38/39's will warrant more gearing, but at that point I'd rather add an extra t-case than re-gear two perfectly good axles. /forums/images/graemlins/thinking.gif

    [/ QUOTE ]

    I'm perfectly happy with my 4.10s and 38.5s, although 4.56 or 4.88 would be more desirable, I havne't yet put out the coin to re-gear yet.
     
  5. monsterjim

    monsterjim 1/2 ton status

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    4:10 sounds good, I went from 3:08 to 4:88 when I put the corp 14 and 3/4 ton 10 bolt in. 4th gear at 65 is 3450rpm. Thats with 36" tires. Luckily I trailer it if I have to go to far.
     
  6. Confedneck

    Confedneck 3/4 ton status

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    well i have 33s behind my sm465 and 3.40 gears and i can peg the speedo at about 3k rpms... so if i was going with 35s i wouldnt go any lower than 3.73s in MY truck, but then im not afraid to use LO and LOW offroad..
     
  7. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    [ QUOTE ]
    I ran 35's and 3.73's with my SM465. Then 36's with the same gears and it was fine...and relatively sane on the freeway.

    Recently went to 4.56's and 39.5's (and diesel) and I could use an overdrive.

    Rene

    [/ QUOTE ]

    thats why i want a diesel. the low end grunt to push 42's and 4.10's with the RPM at 65 would be in the nice zone for the diesel.

    im not going to re gear my stuff for a while, and the low in the 465 will be able to push through everything at the stop light. with the doubler and the 465 with 4.10's ill have no problem on the trail.
    Grant
     
  8. ZonkRat

    ZonkRat 1/2 ton status

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    MPH x Gear Ratio devided by Tire Dia. x 336 =RPMs.If you have OD do RPMs x OD ratio.Hope it helps. /forums/images/graemlins/thumb.gif
     
  9. Hossbaby50

    Hossbaby50 3/4 ton status

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    Like mentioned. 4.10's or 3.73s with a 465 and 35's. A buddy of mine had a th350 with 4.56's and 35's and he would turn 3000rpm on the freeway at 65. He got 7mpg on the highway because of it.

    Harley
     

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