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4.56's and 33'

Discussion in 'The Garage' started by jtpepper, Feb 3, 2004.

  1. jtpepper

    jtpepper Registered Member

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    4.56\'s and 33\'

    I'm thinking about installing 4.56's in my axles to help it out,but I'm curious as to what the rpm's would be.I have a 700r4 in it with 3.42's and 33" bfg mud ta's.I normally cruise 65mph on my speedo wich is probably 70-75mph in reality and my rpm's are between 2050 to 2150.I'm planning on going to 35"-36" tires eventually when the money permits.Would it be driveable with the 33's on the highway or should I go with 4.10's?Any help and info would be greatly appreciated.Thanx and GOD Bless,jtpepper
     
  2. kombi59

    kombi59 1/2 ton status

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    Re: 4.56\'s and 33\'

    I run 456's in my 84, with 35's 350 trans. good combo I run 60-65. you should be ok, especially with the 700r. /forums/images/graemlins/waytogo.gif
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    Re: 4.56\'s and 33\'

    with the overdrive it will be fine /forums/images/graemlins/thumb.gif do you ever plan on going to a 38 or bigger tire? if yes do it right the first time and go with 4:88's /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     
  4. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    Re: 4.56\'s and 33\'

    Try this site out your answers will be given at 4lo.com/4LoCalc
    Bill
     
  5. HarryH3

    HarryH3 1 ton status Author

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    Re: 4.56\'s and 33\'

    You might want to slow down a tad before you get a speeding ticket. 2071 RPM with 3.42's, in overdrive, and a true 33 inch tire works out to 85 MPH. /forums/images/graemlins/eek.gif

    At 70 MPH, with overdrive and 33's, the engine would be spinning around 2275 RPM. Get the 4.56's, you'll be glad you did, especially when you upgrade to the 35's. /forums/images/graemlins/thumb.gif
     
  6. SUBFAN

    SUBFAN 1/2 ton status

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  7. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: 4.56\'s and 33\'

    I run 4.56's and 35's with a 700R4. I used to run 32's with the same combo. It was great with teh 32's. I could climb any pass and cruise was pretty good with the OD. Now that I stepped up to the 35's I wish I had went to 4.88's or 5.13's. 4.56's and 35's isn't a bad combo, but I wish my cruise RPM was a little higher for the little extra power and the extra RPM when I kick down to climb a pass.

    Definitly not 4.10's. Your transmission will hate you if you do. I consider 4.56's with 35's and 700R4 the minumum combo for that trans. Otherwise you are risking burning up the trans in OD because the RPM is too low for the torque converter to lock up.

    I say if you are going to go with 35-36" tires then 4.88's. 37-38" 5.13's. I wish I had.

    Harley
     
  8. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: 4.56\'s and 33\'

    I had 4.10s and 35s and hated it with a 700R4. If I'd had the choice I would have had 4.88s with the 35s.

    Go 4.56 or 4.88 with the 33s, you'll love it.
     
  9. jtpepper

    jtpepper Registered Member

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    Re: 4.56\'s and 33\'

    Thanx to all who've posted.It's been a big help.Are the rpm's listed on these calculaters compensating for auto tranny slippage,if not,around about how much more rpm's would I be turning?When I'm cruising down the highway,I do notice that I pass most everybody,but my Jimmy is cruising so nicely there/forums/images/graemlins/woot.gif.Thanx for the info,GOD Bless,jtpepper
     
  10. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Re: 4.56\'s and 33\'

    I have 4.10's, 35's, and a th700 and have no problems with cooling. You can run this combo if you have a pretty torquey motor and I get decent mileage on the highway because of the higher ratio. I would go 4.88's if I were you. That is the ratio I'm switching to.
     
  11. HarryH3

    HarryH3 1 ton status Author

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    Re: 4.56\'s and 33\'

    [ QUOTE ]
    Are the rpm's listed on these calculaters compensating for auto tranny slippage,if not,around about how much more rpm's would I be turning?

    [/ QUOTE ]
    The 700R4 tranny has a lockup torque converter, so there is no slip at highway speeds. /forums/images/graemlins/cool.gif
     
  12. 89BlazerK5

    89BlazerK5 1/2 ton status

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    Re: 4.56\'s and 33\'

    i run 4.56 with 33's, and i love it....... don't try it if you don't have o/d though....... she just about tops out at 75...... i have no need to go that fast anyways.....
     

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