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what gear's for 35's

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by blazingboy, Dec 4, 2001.

  1. blazingboy

    blazingboy 1/2 ton status

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    what gear\'s for 35\'s

    Could I run 35's on the street with my 3.73 10 bolts.
     
  2. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    Re: what gear\'s for 35\'s

    yup you could, my friend does it with 3.08s. if you have overdrive go with 4.56s and if you don't go with like 4.11s. i think i've seen 4.33s before too. the 3.73s aren't the prob. i have 3.73s with my 36"s and i do alright (for the time being), it's the 10 bolts i would worry about. i don't know though i'm a 3/4 ton.

    people that get good mileage aren't having any fun!
    scott,
    1989 GMC suburban 3/4t 4" lift finally rollin on 36" swampers, tbi350, th350, np241
     
  3. 1979Jimmy

    1979Jimmy 1/2 ton status

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    Re: what gear\'s for 35\'s

    Im running 35s with 4.11s and they work great, you could do it with 3.73s though

    79 Jimmy, 5" lift 35 M/T with a 383 puttin out 400hp and 450lb/ft. Locked front and back.
     
  4. 88K5Jimmy

    88K5Jimmy 1/2 ton status

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    Re: what gear\'s for 35\'s

    What kind of gas mileage would u get with 35's and 3.73s and 700R-4? Can you even put it in OD??
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: what gear\'s for 35\'s

    Probably pretty crappy unless you had a really torquey motor, you're risking burning up the tranny, and, no, you really couldn't put it in OD unless you had quite a bit of torque (more than a stock 350 anyway).

    I have 4.10s and 35s with a 700R4. Even this isn't enough gear. I would swap to 4.56s if I wasn't putting in a 4 speed.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  6. JIM88K5

    JIM88K5 1/2 ton status

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    Re: what gear\'s for 35\'s

    You could run 3.73's. I myself am way glad I went w/4.56 .
    If mostly street & some freeway do 4.56. Around town it's
    pritty snappy and on the freeway in OD I run with the flow
    of traffic @ around 2300 or 2400 rpm.

    88 5.7 5in lift 35"procomp at's
    700-208-456-3in exh w/flowlowder 10 bolts & some ORD stuff
     
  7. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    Re: what gear\'s for 35\'s

    I've had 4.56s as long as I've had 35s...its a good combo, and if I wanted to run 37s or 38s, it wouldnt be a BAD gear either...so tire upgradability with the 4.56s is a lil bonus.

    J


    See the on-going build up of my '85 Jimmy! http://community.webshots.com/user/jekbrown
     
  8. txbartman

    txbartman 1/2 ton status

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    Re: what gear\'s for 35\'s

    I ran 3.73s with 35s for a while with a tired 305. It did okay, but forget about OD. I swapped to 4.56s and have never looked back.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  9. TXsizeK5

    TXsizeK5 1/2 ton status

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    Re: what gear\'s for 35\'s

    hah, i think ive had it really bad. I had 35 BFG mud terains on 3.08's with a 305 that has worn out piston rings... if you dont know what that means that means ive lost ALOT of compression and prolly putin out less hp than some honda civics! Of course i have 4.56 now and I love them... I can still drive highway but not fast prolly aound 60-65 at the max.
    Thats with a 4spd manual tranny, if you have overdrive then 4.56 will be badass. As for your question of being able to run 35's on 3.73's hell yeah you can. If i ran my 35s on a 100hp 305 with 3.08's you can run em with 373's.

    6in 87' K5 w/ 35" BFG muds.
    305/Sm465/ NP208
    Kn, 4.56's.
    In desperate need of a rebuild.
    Next- Eaton mech locker... Flows.
     
  10. blazingboy

    blazingboy 1/2 ton status

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    Re: what gear\'s for 35\'s

    So why coulden't I use overdrive and why would it burn up my tranny.
     
  11. muddin4fun

    muddin4fun 3/4 ton status

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    Re: what gear\'s for 35\'s

    The torque converter locks up around 2,000 rpm. Under that it's designed to slip. If your gears are too high then the torque converter won't lock up and you'll get a tremendous amount of heat which kills auto trannies expecially a 700R4. I've got a TH350 and i'm going 4.56's with 35's. I plan on putting an OD in my truck.

    Don't hit me, Mr. Moderator... I'll go back on topic... I swear![​IMG]

    <a target="_blank" href=http://www.geocities.com/muddin4fun79blazer>www.geocities.com/muddin4fun79blazer</a>
     
  12. JROSS

    JROSS 1/2 ton status

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    Re: what gear\'s for 35\'s

    I run 35's and 3.73. It will get you around town and on the freeway o.k., but accel is kind of slow. I plan to upgrade to 4.10's. I have TH350, no OD.

    81 Blazer Silverado Package, 350, 4" lift, 35" tires
     
  13. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Re: what gear\'s for 35\'s

    The RPMs would be too LOW in overdrive (below your engines powerband)....so there wouldn't be enough power to keep it there.

    As far as the transmission.....the higher gears (lower numbers) don't give you as much torque multiplication as a lower gearset would. Using low gears takes a lot of load off the engine and transmission.....and that reduces heat.

    It's kind of like trying to pedal up a steep hill on your 10-speed in the wrong gear.....you're LEGS start to burn because the gears aren't helping to get you up the hill. That's what is happening to your transmission when you ask it to move the weight of your truck &amp; heavy tires without a decent gear. But in that case, it's the slippage of the torque converter that causes the heat.....

    Sometimes I think people blame the transmission (or builder) for failures, when in reality they just have a truck with poorly matched components in it.


    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  14. blazingboy

    blazingboy 1/2 ton status

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    Re: what gear\'s for 35\'s

    The fastest I would probaly ever get would be about 60 to 65
    would that matter that much
     

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