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So Many Gears but WHAT to get?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Monster, Aug 5, 2002.

  1. Monster

    Monster Registered Member

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    My 86 K5 has front and rear 10 bolts with 3.08 gears. I want 4.88. Can I put this in my 10 bolt. I dont off road its just a big pavement pounder. /forums/images/icons/confused.gif
     
  2. Rebel88

    Rebel88 1/2 ton status

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    you can put those in 10 bolts...youll have to get the thick gear setup

    what tranny are you running? if its a 700 like i think it is you dont want 4.88s unless you run 39 or 40 inch tires

    Later
     
  3. jc71355

    jc71355 1/2 ton status

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    What size tire's are you going to run? Is this stop and go driving or highway driving? These will both factor into the decision. With 33's I would run 4.10's. With 35's I would run 4.56's. Like Rebel said you probably have a 700R4. Without improvements these tranny's need all the help they can get. Hope this helps.

    James
     
  4. bUrLyBlAzEr89

    bUrLyBlAzEr89 Registered Member

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    i think it depends on what you wanna do w/ it. like i do alot of daily driving so im sticking w/ the 373 w/ 33's for good gas milage and performance
     
  5. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    For the street I would use 4.88s w/35s. (Assuming you have O/D) I don't think I would trust that pinion offroad, though, Id go w/ 4.56s w/ 35s if you don't have O/D or if you want to wheel it.
    You do not need a fat gear to change from 3.08s to 4.88s in a 10B, they both use the same carrier.
     
  6. Monster

    Monster Registered Member

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    I do Have Over Drive. My 700R4 Was just rebuilt. Has a shift kit in it and a super heavy duty torque converter.
     
  7. Jay73K20

    Jay73K20 Registered Member

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    If I was changing gears out and I had 35" tires and a th700r4 I would go with 4.88 because that would give you 2150 rpm at 65mph when your TC is locked up.
     
  8. RESTORE89

    RESTORE89 1/2 ton status

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    i cant imagine running tires large enough to need 488 on a 10 bolt axle
    just seems a bit excessive. i think if i were running large tires i would try to find
    a good junkyard 14 bolt axle and then gear it according to tire size, and if you
    NEVER go off road then dont even worry about changing the front
     
  9. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    4.88 with 10 bolts=====Explosion The pionion is to small. I went to 4.56's in my 10 bolts and they are fine with 33's
     
  10. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    4.88s would be fine for crusing the mall. Plenty of people running 35-44 on their 10B. Not my cup of tea, but they're out there. If you ever want to use it then I deffinatly agree, the 4.88s just seem too dantiy.
     
  11. Chris_T

    Chris_T 1/2 ton status

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    With the OD transmission 4.88s with 35's isn't overkill at all as far as engine rpm goes. I put 4.56s in my 12 bolt and D44 and I wonder what it would be like with 4.88s, which might have been a better choice since I find myself thinking about 37s every now and then.

    CT
     
  12. wrathORC

    wrathORC 1/2 ton status

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    With 4.88s and a ten bolt you're looking at about half a tooth during transition. We're talking a dry patch of asphalt on a wet day will do her in. Of course, if you've got a 305 with a dead cylinder or two you'd be alright. Then again, if you're wanting 4.88s chances are you're going to try to see if you get your tires to wrinkle wall.

    I'm a believer in ten bolts. In fact, a ten bolt is good for 400 horses behind a slushbox as long as you keep the tires under 31" tall and run airplane gears (3.42 or taller).
     
  13. ranger

    ranger Newbie

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    I CAN TELL YOU THIS.I HAVE 10 BOLTS FRONT AND REAR WITH 3.73 AND 39"MICKEY THOMPSON TIRES. I PURCHASED A 12 BOLT TO PUT IN THE TRUCK WHEN THE 10 BOLT BLOWS UP AND ITS GOING ON TWO YEARS NOW. I USE MINE IN THE MUD,AND SOME TRAIL RIDING
     
  14. Monster

    Monster Registered Member

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    I guess i will go with 4:56 I dont need my rear to blow. I
    have no funds left. My 2,000 dollar tranny put me in the hole. In the last month I spent 4 grand on my rig. 2,000 for the tranny and another 2,000 for the jasper 300hp motor.
     
  15. wrathORC

    wrathORC 1/2 ton status

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    I hope you got onehellofa transmission for $2000.
     
  16. Monster

    Monster Registered Member

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    Me To !!!! I got a 15 month or 15,000 mile warrenty.
    The Super Heavy Duty Torque Converter was 430 bucks. Its
    got a trans go [censored] kit and some other goodies. I forgot to
    mention he took my T-case apart.Cleaned it up and replaced a bearing. I have a np 208 and it was filled with gear lube instead of ATF so he fixed that problem.
     

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