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gear ratio?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by skykrawler, Aug 7, 2006.

  1. skykrawler

    skykrawler Registered Member

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    I am looking into buying gears, I have the dana 44 front and the 12 bolt rear. For now it's a daily driver/occasional wheeler , I am looking to put some 35x12.50x15's on. What gear ration should I go? 4:10 isnt enough. Can you help
     
  2. ryan22re

    ryan22re 1/2 ton status

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    4.10's are probably plenty if you drive any highways. If that's not the case, go 4.56's or 4.88's.
     
  3. rick88blaze

    rick88blaze 1/2 ton status

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    If you're going with 35's I would go at least 4.56's if not the 4.88's. I've got 4.56's with my 33's and it runs great. But I've got a 700r4 too so the overdrive helps out when I run it down the highway.
     
  4. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    4.10s with a th350 will be just about bearable on a highway if you drive at 70 ish. I used 4.10's with a 700 box and 35's. In O/D my speedo reads 70mph when I'm actually doing 65 so the gearing kind of worked out the same , but even with 5 mph out on the speedo I notive the higher rpm, and that's with a lock up converter. If I didn't have to drive it on the road any distance to wheel I would definatly go with 4.88. But remember, there's a big difference between your 1:1 top gear and my .73:1 with lock up!
    So if you like your fillings IN your teeth......go with 4.10s!
     
  5. jp0863

    jp0863 1/2 ton status Premium Member

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    i say if the 4.10's dont get it, then go with 4.88's. the difference in rpm's from 4.56 to 4.88 is only a couple hundred and you can go up one size in tires if you dont like it. whereas if you go the 4.56 route and want even lower, now you're talking about a whole gear swap again. my vote is go low! tell us what you have (veh wise) for a better understanding of you delima.
     
  6. skykrawler

    skykrawler Registered Member

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    1974 K5, 350 engine, 4:10 gears now, going to 35's hopefully soon, Right now it's my daily driver until it gets done. Then hopefully strictly wheeling.
     

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