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Gear ratio question.

Discussion in 'The Garage' started by vdog, May 30, 2005.

  1. vdog

    vdog Newbie

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    I am currently running 33s on my 89 k5. It has the stock 10 bolt front and rear with 3:42s. I want to run 35s and am looking for a good set of gears to fit into the 10 bolts. My question is what gear ratio would complinent 35 inch tires? Any help is greatly appreciated. I have heard 3:73s, 4:10s and 4:56s. I am in the military and a tight budget. :dunno:
     
  2. Muddytazz

    Muddytazz 1 ton status

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    If your looking for power, go with the 4.56's, if your looking for fuel economy still, go with the 3.73's. I'm running 33's and 4.10's, nice middle if you ask me.
     
  3. rick88blaze

    rick88blaze 1/2 ton status

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    I've got 33's and 4.56's in mine. it's great. at 70mph the engine is at about 2200 rpm's so it cruises just fine. plus i've got great torque for pulling and wheeling. And I found out yesterday, I get the same milieage whether I'm driving empty or with a '78 1/2 ton on 35's and loaded down with camping gear behind me. (I pulled a friend's truck home from Kansas this weekend (160 miles) after the camshaft went out on the way down.) :)

    Rick
     
  4. mxfireman

    mxfireman 1/2 ton status

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    I agree that the 4.10's would be the way to go. I wish that I would have gone w/4.10's instead of the 3.73's I have now. :(
     
  5. Cricket

    Cricket 3/4 ton status

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  6. gone huntin

    gone huntin 1/2 ton status Premium Member

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    I'm runnin' 4:10's in my 'burb with 33's and it tows my 16' trailer loaded w/4 atvs just fine. With 35's I would definately run 4:56's especially if your still runnin' the stock 700r4.
     
  7. BIG*RED

    BIG*RED 1/2 ton status

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    i'm running 3.73 with my 35's ..i have a 14bltff waiting to go in , and when that goes in i will be running 4.88s or 5.13s...
    3.73 with 35s is ok, decent milage and power..on straight level roads, but it is lacking when going uphill, but its allright i guess, bigest complaint was pulling a trailer that weighed almost 6000 up to Oregon, the pass between california and oregon is the highest on I-5..higher than the grapevine in so cal..well with the 3.73 and sm465..i had to climb, in second gear at 30mph the whole way up :eek:...it was a "snail race" betwen me and the semis lol

    now i used to work at a drivetrain shop, and for 35 inch tires we always recommended 4.88..and the people that went 4.88 were happy and i would say 80% of the people that didn't go 4.88 came back and had us re do it with the 4.88s..so i will be going at least 4.88 but most likely 5.13 becasue i plan on going up to a 37 or 38 inch tire once the 35s wear out
     
  8. docgab

    docgab 1/2 ton status Premium Member

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    I personally think it depends on your setup and what it is going to be used for. I have a 350/350/203 with 4.11 right now. For just around the town stuff and for the wheeling it is cool. I hate it on the freeway though. I hit 60-65 and the damn truck is screaming at me, I don't have a tach, but the RPM's are pretty damn high. Since my truck is my DD right now I'm actually gonna be dropping in 3.73's.
     
  9. BIG*RED

    BIG*RED 1/2 ton status

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    yeah with the 33s you have i think my 3.73 will be just right for you...and since i might be heading back up to oregon again..your 4.11 might mean that i can pull the pass at 40mph this time..lol
     
  10. mountain4x4

    mountain4x4 Registered Member

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    I just put 4.56s on my '90 Burb w/700r4 turning 33s and its GREAT. I drive in the mountains, but it still cruises at 75 just fine. OD isnt just for the flats and downhill anymore. If you don't need to go over 75, 4.56 or 4.88s for 35s would be the way to go. I had 3.73s, it was a dog with 33" tires. I'd go with 4.11s if I lived in the flats and never drove up hills, though...
     
  11. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    4.10 and 36's leave you wanting 4.56. It has to drop into 3rd up hills pretty often. I'd go 4.56 for a little bit extra power to get up the hills so the engine doesn't lug.
     
  12. cbbr

    cbbr 1 ton status GMOTM Winner

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    I'm running 4.10 on 35's (350/TH400) and it runs great/tows great.
     
  13. 79chevyk10

    79chevyk10 1/2 ton status

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    I'm runnin 4.56's with 35's soon to be goin 36's with a th350 three speed trans, goes 65mph just fine and will climb a 7% grade without going into the secondaries.

    If you're running an overdrive trans I'd go with 4.88's. IMO
     

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