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4.56 Gears With SM 465

Discussion in 'The Garage' started by 84 K5 4x4, Jan 8, 2007.

  1. 84 K5 4x4

    84 K5 4x4 1/2 ton status

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    I am running a 350/465/205 with 14bff/10b with 4.56 Gears. Does anyone think this is to low or what. My truck is not a dd but i do use the highway a lot. @ 70 mph i am turning 3000 rpms and at 80 i am turning about 3500 rpms. I have a set of 3.73 gears for both my axels but should i swap or not.
     
  2. Confedneck79K30

    Confedneck79K30 3/4 ton status

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    what size tires?
     
  3. Avery4jc

    Avery4jc 1 ton status Premium Member GMOTM Winner

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    35's
     
  4. NEK5

    NEK5 3/4 ton status Premium Member

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    hmm, i`m going to say 4.10s, seems ideal for a 465 tranny with 35s.....3.73s i`m not sure on, might be too little gearing...
     
  5. 84 K5 4x4

    84 K5 4x4 1/2 ton status

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    Sorry yes i am running 35s
     
  6. readymix

    readymix 3/4 ton status

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    I ran a SM465 / 4.56's and 35's on my truck for years. It was right at 3000Rpm @ 70Mph all the way from Illinois to So-Cal last year. No problems at all.
    I just recently put the 39.5" Iroks on and it seems to be a little easier on the highway.
     
  7. Confedneck79K30

    Confedneck79K30 3/4 ton status

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    go to 38s... less rpms...
     
  8. MuddinManny

    MuddinManny Banned

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    I have a 383 w/465/208 and 4.56's. I'm running 15.5x39.5x17 TSL's. I'll be doing about 2350 RPM @ 65 mph.

    When I had my 350 in the rig, with 13.5x39.5x15 Iroks, I did about the same, 2350. 4.56's are a little steep for 35's. Better off with 4.10's or move up to 37-39 tire class. JMHO.

    Manny
     
  9. twoslo4five0

    twoslo4five0 3/4 ton status Premium Member GMOTM Winner

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    im gonna run a 465 with 38s and 513...might be a lil high on the highway but if i ever go to a bigger tire i will be just fine...
     

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