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35's with stock gearing?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by SuperUnknown, Feb 8, 2001.

  1. SuperUnknown

    SuperUnknown 1/2 ton status

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    35\'s with stock gearing?

    I "need" some biger tires! Is anyone running 35" tires with stocke gearing? I don't think I can afford new tires and gearing right now. Should I save up and get it done all at onece or can I get away with 3.07 gearing for a while?
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Re: 35\'s with stock gearing?

    Stock gears arent going to hurt anything. What makes you think it will? Millions of people run big tires with high gears like yourself. I have seen big tires on higher gears like 2.73's.
     
  3. chevy4x4

    chevy4x4 1/2 ton status

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    Re: 35\'s with stock gearing?

    I've seen a chevy with 44s, 10 bolts and 2.73 gears. it was in one of em mags and it was going through some mud. I read that if you run big tires with high gears it can ruin your tranny. dom't remember how but is this true?

    [​IMG]
    [​IMG]K5[​IMG]
     
  4. TX Mudder

    TX Mudder 1/2 ton status

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    Re: 35\'s with stock gearing?

    I run 33's on 3.73's. It's a pain as is. Can't imagine running 3.08's with 35's, but I have no first-hand knowledge.
    When my tires ever wear out (wearing like steel) I plan on buying 36's and keeping 3.73's.
    -- Mike
     
  5. SAVAGE1

    SAVAGE1 1/2 ton status

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    Re: 35\'s with stock gearing?

    Right now I'm running 35" Boggers on 10 bolts with 3:08 gears and no lift!! [​IMG] I can already see most of you guys shaking your head. This setup sucks but it gets me around fine. Most people say they wouldn't dare go wheelin with my setup, but I do it anyway. I can get through deeper mud and steeper hills than my buds can in their Jeeps! If your rig is a pavement pounder then I think it should be alright.

    Just my $.02
    Rod

    BLAZER FOOD!!
    [​IMG]
     
  6. 90K5

    90K5 1/2 ton status

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    Re: 35\'s with stock gearing?

    It will be really slow. for 35's you would probably be happiest with 4.56's

    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>
     
  7. Jason73K5

    Jason73K5 1/2 ton status

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    Re: 35\'s with stock gearing?

    I used to run my old '85 with 35" BFG Mud Terrains, 3.08's and a 700R4. My mileage suffered a bit and I couldn't use overdrive as much, but I never had any problems and could still smoke a tire every once in a while. Acceleration was pretty good but I think I would have gone to 3.73's or 4.11's in the long run. Right now I have a '73 with 35's, 4.11's and a TH-350 and think the RPM's are a bit high for most situations. I think you'll be fine as-is, and you can always change gears later if you'd like.
     
  8. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Re: 35\'s with stock gearing?

    Reading everybodies posts here reminds me of an 82 half ton I used to own. It had 350 and 4 speed with 3.08 gears. It rode on 4" lift and 33" tires. With that 4 speed, you could go on the highway at 60 mph in third gear!! The motor was not screaming, it was just purring along until I shifted into 4th, and then the rpm's dropped. Couldnt pass cars very good in this gear, so I downshifted to 3rd to pass. It wasnt bad with this ratio, as it was kind of like an overdrive.
     
  9. Cmoe

    Cmoe 1/2 ton status

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    Re: 35\'s with stock gearing?

    I ran the same thing for 4 years until I rebuilt the rear end.....

    C'moe

    <font color=black>the blazer is "Back in Black"
     
  10. ragtop

    ragtop Registered Member

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    Re: 35\'s with stock gearing?

    I thought mine really sucked with 31's and 2.73's. If your running a 700R4, like I am, the engine would really be turning too slow at 60mph. I think mine was at about 1100 rpm at 60mph and yours would be considerably slower with bigger tires. I changed to 3.42's and am much happier (so's the engine) and the truck pulls most any hill on the street OK at speed (55mph+) in OD. Also remember that, if yours is a 700R4, the engine vacum may be low enough for the convertor to unlock and stay unlocked most of the time. In OD, that will burn up the tranny. Check out http://www.ring-pinion.com/RPMCalculator.html, it's an easy to calculate rpms with different gears and tires for various speeds and transmission types.

    Ragtop - '88K5 [​IMG]
     
  11. CaptCrunch

    CaptCrunch 1/2 ton status

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    Re: 35\'s with stock gearing?

    I've heard 3.73's for 33's and 4.10's for 35's. I'm putting on 35's this spring and am wonder which to go with myself... Anyone w/ suggestions? The truck is a daily driver about 90% of the time and doesn't do too much hardcore offroading... just some mud and stuff usually. Gas milage on the freeway would be a big plus... any suggestions on rpm in OD at 65?

    1987 Chevy K5 Blazer- 350 TBI
     
  12. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: 35\'s with stock gearing?

    Hey K30dude [​IMG]
    My Jimmy had 2.73's and 33" MT's when I bought it, 4 speed standard as well. I used to have to use lo-first to start off and fourth was basically an overdrive! 65 MPH in 4th it was turning maybe 1700 RPM. I even towed our trailer with it that way, although the hills really sucked because I always seemed to be in the wrong gear, the steep hills were to much to use 3rd, but 2nd it would just scream. 3.73's fixed all[​IMG]

    Rene

    [​IMG]
     
  13. bigblue

    bigblue 1/2 ton status

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    Re: 35\'s with stock gearing?

    I run 35 BFG Mudders with 3.73 gearing. It seems to be great on the highway, ok off road, with a little power loss but i can deal until i get teh 14 bolt

    baja surf nazi
     
  14. Hobbes68

    Hobbes68 Registered Member

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    Re: 35\'s with stock gearing?

    I have 35's with factory 3.73's. It's a livable setup. I wouldn't want to go any steeper on the gearing though. Accceleration isn't bad, but I'm sure 4.10's would be better and bring it back almost to "stock gearing" for the larger tires. If I ever re-do the rears I'd put in 4.10's. Also my speedo / odo is about 10% slow.
     
  15. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Re: 35\'s with stock gearing?

    Yeah, those were the days!! Yeah, right!! I sold that truck to a local kid and he didnt like the performance on it. So, what did he do? Installed 3/4 ton 4.10's and 15" rims. That truck is quite a cooker now.
     
  16. nyyef

    nyyef 1/2 ton status

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    Re: 35\'s with stock gearing?

    it all depends on how you will use.....or abuse...your rig. i have seen 14bolt FF puke out the diff cover, and i have seen 10 bolts survive with 38s and 3.08s.

    Knife.
    knife.coloradok5.com
     
  17. baldbandit

    baldbandit 1/2 ton status

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    Re: 35\'s with stock gearing?

    When i had my J@@P, i ran 36x15x15 super swamper radials with 3.08 gears for about 3 months and it had a in-line 6 cylinder. It would still spin these monsterous tires (for a 6 cylinder) and would haul @ss! i couldn't believe it! When i regeared, i went to 4.56. It really would haul @ss then. I wheeled it (mud) with both sets of gears and it done fine with the 3.08's but was untouchable with the 4.56. If u run 35's, u should try and change gears or axles with better gears when u can afford it.

    baldbandit
     
  18. achuskies69

    achuskies69 1/2 ton status

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    Re: 35\'s with stock gearing?

    <font color=green> one of my friends has a '94 tahoe two door with a 6"lift and 35x15's with 3.73 gears. ive rode with him and it has lots of power and seems to do great offroad. im running 3.08's in 10 Bolts with 33's, its slow but im switching to 3.73's and 35's when these wear out....

    <font color=orange> if you cant beat 'em, drive over 'em </font color=orange>
    [​IMG]
     
  19. BLZN4FN

    BLZN4FN 1/2 ton status

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    Re: 35\'s with stock gearing?

    I put a set of 35 on factory 10 bolts with 3.08 boy was it a pig I had to go to 4.56

    that made all the difference in the world put the 35's on and when you get the money step up and regear.

    Bo
     
  20. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    Re: 35\'s with stock gearing?

    Well, I myself have run 35's with the stock 3.08 gears. On my Jimmy, I was running 35-15.50-15 SX's with the stock gears. It slacked just a little bit, but I only went serious wheeling once and it did just fine. I would have swapped those for 4.11's. It still had a bit of move, maybe that was because I was running a TH350 tranny. You'll be fine for the time being.

    "Don't hit me with them negative waves so early in the morning." Odd Ball--Kelly's Hereos
     

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