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4.56 vs 4.88

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by big83chevy4x4, Feb 3, 2004.

  1. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    ok what gear retio should i go with? im stuck between the two. im going to be runnin 350/465/205 d60/14bff and 37s or 39s maybe 40s

    im thinking 4.65 because i don't have overdrive, and i have creaper but then 4.88 sound better i dunno /forums/images/graemlins/dunno.gif
     
  2. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    Try this Link
    Bill
     
  3. Z3PR

    Z3PR Banned

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    Well, sence you have a sm465, I would say go with the 4.56's if you ever drive on the highways, if it's a off road only vehickle, then think 5.13's
     
  4. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    4.88's
     
  5. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    ive tried the calculaters but cant deside what rpm i want replies that have had the 4.56 and with they had 4.88 or vice versa

    this thing is going to be a all around vehicle mud, sand, rocks, street, snow. probably more mud, sand, and snow than street and rocks. it is going to be driven to wheeling spots
     
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I prefer 4.88 for tires in the 39" and 40" range.

    4.56 would work better for the 38" and shorter range especially with overdrive.

    Then 5.13 would be best left for 42" and larger tires. /forums/images/graemlins/thinking.gif
     
  7. crawlink5

    crawlink5 1/2 ton status

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    My preferences for a street driven daily driver with overdrive.

    3.73 to 4.11 ---> 33s
    4.11 to 4.56 ---> 35s
    4.56 to 4.88 ---> 37s

    My preferences for a daily driver without overdrive.

    3.73 ---> 33s (still hi RPM at upper speeds)
    4.11 ---> 35s
    4.56 ---> 37s


    if you are not daily driving and going to 40s one day I wouldn't consider anything below 5.13s.

    But, you might not like what other people swear by.

    The BEST advice I can give you is be honest with yourself about what is important to you. If you must have the best offroad equip at the sacrifice of on-road drivability then go to a lower gear. If you are driving this thing on the road 99% of the time then you'll hate the lower gears unless you have deep pockets and really enjoy the high rpm motor. Which, you should get a cam that has a cruise rpm to match what you are running. The % in each environment is the important deciding factor.

    It is better, IMHO, to make one drivable with the gears and then later get lower transfer case gears to get a better crawl ratio. That way you have the best of both worlds.

    All that said, if you are running in the mud you'll want to stay on the taller side so you can get some tires spinning faster. In the rocks, on the lower side.
     
  8. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    i have the sm465 np 205 14ff dana 60 4:10 combo and 38's and if i had the money id do it right the first time and go with 5:13's you plan on 39.5's or 40's so i would go with atleast 4:88's /forums/images/graemlins/thumb.gif
     

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