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what gear ratio

Discussion in 'The Garage' started by obijuan, Nov 28, 2006.

  1. obijuan

    obijuan 1/2 ton status GMOTM Winner

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    ive been looking at sets of axles and i am wondering if 4.56 is too much for 35 inch tires. sometime later i plan on 37's.
    i have an 85 k5 with the 350 with mild cam and headers/700/208 and right now its got the 3.08 in it. what will i experience with 4.56 or 4.11 (if thats better?)with mostly highway driven vehicle and the occasional muddy weekends? i drive about 60 miles a few times a week for school and really dont want to mess up my newly rebuilt trans (6K)
    mileage is a factor but i dont really mind buying gas. are highway rpms going to be too high with 4.56 as opposed to my 3.08? and which one will have a better final drive ratio? anybody running 4.56 with a 700 and like it or dislike it?
    sorry for the really long post and all the questions but i think i found an alright deal on a set and alot has been on my mind about it lately.
    thanks again! really!
     
  2. 88Silverado

    88Silverado 1/2 ton status

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    Im currently running 3:73's with my 33's and 700R. Im going to change them to 4:56 when I go to 35's. I cant imagine running 3:08's with 35's, figure it would be a slug.
     
  3. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    4.10s are plenty for 35's - you'll notice a real nice increase in power and keep your highway rpms nice and low w/ that overdrive trans. 4.56 would be killer, but highway rpms are going to increase a bit.
     
  4. 87BrnRsd

    87BrnRsd 1/2 ton status

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    Go 4.56 Im running a 700 with 4.56's and 37's. It pulls real good, but I wish I had 5.13's!
    -Harrison
     
  5. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    with a 700 I'd go 4.56 or 4.88 fo 35 or 37
     
  6. mostwanted

    mostwanted 1/2 ton status

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    Do your 700 a favor and put in the 4.56. I plan to run 5.13 with 38"-40" tires.
     
  7. obijuan

    obijuan 1/2 ton status GMOTM Winner

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    thanks alot for the info. pretty reassuring, i think ill go 4.56 thanks again!
     
  8. sgarrison

    sgarrison 1/2 ton status

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    I'm running 4.88s with 36s and R.P.M.s on the road are not a problem. If I had to do it over again, I would probably would go with 5.13s. You can always tire up later.:wink1:
     
  9. obijuan

    obijuan 1/2 ton status GMOTM Winner

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    its a huge slug as afore mentioned so will my trans be switching into overdrive and back all the time or will it just cruise in OD? that would be nice. is my mileage going to suffer too? again thanks for your good help!
     
  10. gmc4cw

    gmc4cw 1/2 ton status GMOTM Winner

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    I ran 4.56 gears, a 700R4 and 35" boggers. perfect gearing. lots of power and the rpms were not high at all.
     

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