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Gear Change??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by nau81blazer, Mar 6, 2004.

  1. nau81blazer

    nau81blazer 1/2 ton status

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    Hey all,
    New to the CK5 membership, but i've been enjoying the abundance of information on this website for about a year and a half now. Anyway, my question is I eventually am going to run 38's on my machine but i only have 33's right now. I have heard 4.56 is a pretty good ratio but is that really gonna hurt as far as gas mileage around town? Every once in awhile it has to hit the highway too. I'm all ears..../forums/images/graemlins/ears.gif
     
  2. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    I run 4:56's and 38's on my rig. It gets about 10-12mpg. I drove it 70mph from Sacramento,CA to Seattle,WA.! I've been thinking of going to 5:13's for MORE power off road!
    Bill
     
  3. nau81blazer

    nau81blazer 1/2 ton status

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    Sounds good. I don't have a trailer or anything so it will still have to drive on highway to get from trail to trail. Thanks for the post
     
  4. cuzinjay

    cuzinjay Registered Member

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    I ran 4.56's in my 81 blazer stock 350/th350/208 with 39.5 tsl and that was IMO that wasn't enough.
    I had to run 4L all the time offroad and in the deep stuff it would dog not horrible but it me me wish I had more gear.
    Daily driving was not to bad but, I was on the coast in S.C so it was flat everywhere.As far as mpg I don't realy remember but, I think gas was $.88 a gal on back back then.With your 33's/4.56 you are going to be burning some fuel around 3,000 @ 65mph acording to the chart from 4wheel parts cat. I have.
    I run 33's now with 4.10's and I think thats about perfect to me.
     
  5. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    5.13's! That is barelly low enough for an automatic and 38's. Most guys prefer 5.13's with 35's.
     
  6. nau81blazer

    nau81blazer 1/2 ton status

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    Haha, mine still has to go over 45mph though!/forums/images/graemlins/histerical.gif Thanks for the replies though.
    --Adam/forums/images/graemlins/k5.gif
     
  7. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    Haha, mine still has to go over 45mph though!/forums/images/graemlins/histerical.gif Thanks for the replies though.
    --Adam/forums/images/graemlins/k5.gif

    [/ QUOTE ]
    I know, You could do 80+ if you wanted too with 5.13's and 35's...with 38's, plenty of top end.
     
  8. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    With 5.13's and 38's you would be spinning 2,948 RPM's at 65mph in direct drive which is fine. If you have OD then you will be down at about 2,100-2,200 RPM's which would be perfect.
     
  9. nau81blazer

    nau81blazer 1/2 ton status

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    Very true. I stand corrected.
     
  10. Derf00

    Derf00 1/2 ton status

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    5.13's, 38's, 700R4. /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     

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