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3.07 and 35's anyone

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by zach78k5, Apr 12, 2001.

  1. zach78k5

    zach78k5 1/2 ton status

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    3.07 and 35\'s anyone

    or 36's. i am running 33s right now with plenty of power. will 2-3 inches of tire make much of a difference. i see that there will be about a 10 percent drop in rpm. will my tranny handle it. i think that i have 3.07 maybe 3.73. how do i check? does anyone know the gear ratios of 1,2,3 gear in a TH350? that would help me figure my gear ratio i suppose. i dont know. any help would be much appreciated. i have a brand new 350, a quadjet carb, edelbrock performer intake, k and N filter setup, dual exhaust, yadda yadda. thanks
    my main concern is will it harm my transmition, if the truck is slower i dont really care, i can handle that for a little while
    , I dont plan to go offroad much with the bigger tires, it is mainly for look and the freeway rmp will be better.<P ID="edit"><FONT SIZE=-1>Edited by zachs78k5 on 04/13/01 04:41 PM (server time).</FONT></P>
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Re: 3.07 and 35\'s anyone

    Just a suggestion, go 4.11 for 35's or 36's, make things more snappy. To check just pull of your rear diff cover and check the ring gear, there should be two numbers in the middle of some other, something like 41:11 which is 3.73.

    [​IMG]
     
  3. riz

    riz 3/4 ton status

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    Re: 3.07 and 35\'s anyone

    <font color=purple> Lift the rear of your Blazer off the ground, then make a mark on your driveshaft and your rear tire at the same spot. Then slowly turn your tire as you count how many times your driveshaft goes around in comparison to your tire. 4 revolutions of the driveshaft per 1 revolution of your tire = 4:1 or 4:10 gears .......... 3 3/4 revolutions of the driveshaft per 1 of the tire = 3.75:1 or 3:73 gears ......... get it ?

    L8r,
    . Riz . <A target="_blank" HREF=http://www.geocities.com/rizmonkey>http://www.geocities.com/rizmonkey</A>

    [​IMG]
     
  4. riz

    riz 3/4 ton status

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    Re: 3.07 and 35\'s anyone

    <font color=purple> Or you could look in the inside of your clove box and there should be a sticker that has the gear ratio on it from the factory ........... this is if they are original gears.

    L8r,
    . Riz . <A target="_blank" HREF=http://www.geocities.com/rizmonkey>http://www.geocities.com/rizmonkey</A>

    [​IMG]
     
  5. riz

    riz 3/4 ton status

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    Re: 3.07 and 35\'s anyone

    <font color=purple> I meant Glove box not clove box.

    L8r,
    . Riz . <A target="_blank" HREF=http://www.geocities.com/rizmonkey>http://www.geocities.com/rizmonkey</A>

    [​IMG]
     
  6. riz

    riz 3/4 ton status

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    Re: 3.07 and 35\'s anyone

    <font color=purple> I meant Glove box not clove box.

    L8r,
    . Riz . <A target="_blank" HREF=http://www.geocities.com/rizmonkey>http://www.geocities.com/rizmonkey</A>

    [​IMG]
     
  7. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    Re: 3.07 and 35\'s anyone

    I wouldn't do it. I think you need to check and see what gears you have. I have 3.08's and 33's With a crate motor. And once I am uo to speed it is fine. It just takes me a long time to get there. I bought 4.56's and am putting them in next weekend.

    [​IMG]
     
  8. zach78k5

    zach78k5 1/2 ton status

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    Re: 3.07 and 35\'s anyone

    that makes sense, thanks. sometimes it is the simple thing that works the best
     
  9. Sammy

    Sammy 1/2 ton status

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    Re: 3.07 and 35\'s anyone

    3.07 and 35's. Been there, done that, BLEW UP!!!

    "K5 Grand GT Blazer Silverado in the Netherlands."
     
  10. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: 3.07 and 35\'s anyone

    Just pull the cover...I really don't know what the big deal is. The diff probably needs new oil anyways and it is probably one of the simplest jobs you can do on your truck. The ratio of pinion teeth to ring gear teeth is usually stamped on the edge of the ring gear. Trust me this method will erase all doubts about gear ratio, open or posi or Gov-lock, and lastly you'll get a chance to inspect al the dirty bits...[​IMG]

    Just my 2 cents

    Rene...pulling cover just for the hell of it[​IMG]

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  11. Michael

    Michael 1/2 ton status

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    Re: 3.07 and 35\'s anyone

    I am running, in a '74 2WD, a very old stock 350 w/ 165,000 miles on it, stock 350 tranny same miles. I have a 3.07 and 35's. I drive it daily 110 miles to Dallas and back. It's not a race truck, but it really seems OK to me. I can keep up with everyone else, it slows a little uphill. It hasn't hurt my tranny, that I can tell. I would like to change to 4.10's when money alows, but it really doesn't seem bad to me.

    Michael[​IMG]
    <A target="_blank" HREF=http://www.jmartin.net/parker/goose.htm>http://www.jmartin.net/parker/goose.htm</A>
     
  12. BurbinOR

    BurbinOR 3/4 ton status

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    Re: 3.07 and 35\'s anyone

    Had that combo in my '75...........of course the motor was a 454, tranny was a T400 and it pulled like a rocket. Still needed 4.11's to do it right............

    <font color=orange>'79 - 406 TPI -<font color=orange> K5#5 - <font color=blue>See it at---&gt;<A target="_blank" HREF=http://www.blazzinor.coloradok5.com>http://www.blazzinor.coloradok5.com</A>
     
  13. Daveytree

    Daveytree Registered Member

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    Re: 3.07 and 35\'s anyone

    I had 410 gears with 36 inch tires. It was great. I had plenty of power and plenty of highway speed. R.P.M.'s were right where I wanted them. I ran 308 and 33's for a couple of years. It worked but it was a little gutless.

    [​IMG]If you don't like my driving, <font color=red> get back on the road.</font color=red> [​IMG]
     
  14. 4GUNZ4X4Z

    4GUNZ4X4Z 1/2 ton status

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    Re: 3.07 and 35\'s anyone

    I've got 3.08's running 36's. I've got plenty of grunt and can still smoke the tires, but unfortunatly I've gone through 2 tranny's since I went to 36's. I dont think the tires are at fault for the tranny's I think its more the driver in this case. If I didnt smash the right peddle all the time maybe I'd still be on my first trans. It would really be nice to have some 4.56-5.13's, but I'm holding out for some 1ton axles rather than beefing up 1/2ton.

    <font color=blue>Professional <font color=red>JEEP EATER</font color=red> it's a population control thing.</font color=blue>[​IMG]
     
  15. 90K5

    90K5 1/2 ton status

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    Re: 3.07 and 35\'s anyone

    TH350
    1st 2.48 or 2.52 - dont remember
    2nd 1.63
    3rd 1.00

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  16. HispanicPanic

    HispanicPanic 1/2 ton status

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    Re: 3.07 and 35\'s anyone

    YES it will definatly burn your tranny go for 4.10 35's if gas is a concern

    <A target="_blank" HREF=http://jimjim.coloradok5.com>http://jimjim.coloradok5.com</A> [​IMG]
     

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