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?Rear End Ratio?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Ditchdigger, Jan 7, 2002.

  1. Ditchdigger

    Ditchdigger Registered Member

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    Yo!
    I have an 84 K-5 Blazer, TH-700R4 trans
    I have the stock 10bolt with the
    optional factory locker.
    Does anybody know what my rear end gearing is?
    by the way, I have no sticker and would rather not
    pull the diff cover off.

    84 Blazin Bowtie!
    If you spin and Oriental,
    Do they become Disoriented?
     
  2. Ditchdigger

    Ditchdigger Registered Member

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    Anybody?
    Whats your stock gearing?

    84 Blazin Bowtie!
    If you spin and Oriental,
    Do they become Disoriented?
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    jack the rear of the truck up both tires off the ground and turn the tire one compleat turn and count how many times your driveline makes a compleat turn ie turns 3 and 3/4 turns =3:73's 4 and 1/4 turns 4:10's you get the idea[​IMG]

    wheeling videoshttp://community.webshots.com/user/ssmith6333
     
  4. 1bigk10

    1bigk10 1/2 ton status

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    how about an open diff?

    1982 K10 Silverado. [​IMG] 327 SHPE powerplant SM465/205,15"custom lift 38.5"TSL/SWAMPERS 12boltrearD44 front,3.73 gears.
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Whats your engine? Don't feel like looking for that link to the Blazer brochures, but at least for a few years, (80's sometime) a 305 equipped truck could ONLY get 3.08's or 3.73's, that was it. A 350 could ONLY get 3.08's or 3.42's.


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  6. Ditchdigger

    Ditchdigger Registered Member

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    Its originally 305cid,
    Was the TH-700R4 Standard??
    I'm thinking its 3.73s but I'll try Mudhogs idea!

    84 Blazin Bowtie!
    If you spin and Oriental,
    Do they become Disoriented?
     
  7. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Would be interesting to find out if factory trailering options on these trucks included the numerically higher gear ratio standard. 3 leaf front springs, 6 leaf rears and obviously a towing hitch would likely indicate the "towing package"

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  9. JIMs70K25

    JIMs70K25 1/2 ton status

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    I had an '85 K5 with a 305 and 700R4 with a nice stock receiver hitch that had 3.07 or 3.08 gearing. A real pig with 35s.

    Stupid is as stupid does, I just try not to do anything stupid.
    <a target="_blank" href=http://community.webshots.com/user/70gmc>http://community.webshots.com/user/70gmc</a>
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    Ok, in '84, gas trucks, manual transmission was standard. Diesel was the 4 speed auto (OD) ONLY.

    Nothing is listed for axle ratios, but I'd figure my previous post about 3.42's for 350's and 3.73's only available with 305's to be accurate.

    Those of you thinking 9:1 is the limit with 87 octane, the 305 in '84 was rated at 9.2:1, and thats with a "poor" combustion chamber, unlike the Vortecs.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    Well, there goes that theory. : ) Trailer hitch doesn't equal "better" gears apparently.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  12. txbartman

    txbartman 1/2 ton status

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    My 85 had the trailering package. It is easy to tell (besides the sticker in the glove box) because of the wiring harness for electonic brake control above and beyond the typical trailer plug. Mine also had 3.73s with the 305. But, I don't hink that was part of the trailering package as it is listed as a seperate line item entry on the sticker. Mine also has the tranny cooler and oil cooler. Would the oil cooler also be an effect of the trailering packages?

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  13. JJ85K5

    JJ85K5 Registered Member

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    can you put 4.10's or say 4.88's in a stock 10 bolt rear end and front end w/o changing the pumpkin? i can't afford lockers yet but want to turn 35's or 37's.

    thanks

    JJ85K5
     
  14. dyeager535

    dyeager535 1 ton status Premium Member

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    I would assume it COULD be, but if anything, if thats a stock tranny cooler, THAT would be something I would think would certainly be part of a trailering package. Beginning to think GM didn't do much for a "trailering package" on these trucks, you had to piece it together yourself in a special order, or get lucky and find one on a lot that already had all that stuff.

    If I were GM at that time, a K5 trailering package would have been the 350 or diesel, engine and tranny cooler (if auto trans) 3 leaf front, 6 leaf rear springs, trailering hitch and wiring, 3.73's, and 31 gallon tank. Those are all sensible options if you plan to tow, but I'm sure there was no option that covered all of that.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  15. Executioner

    Executioner 1/2 ton status

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  16. k5'er

    k5'er Registered Member

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    i thought that the 350 came with 3:08's?? i hope so, i just bought a whole ft and rear with 3:73's thinking it would be an improvement!!!

    Mud! Its cool!
     
  17. dyeager535

    dyeager535 1 ton status Premium Member

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    3.08's were standard, 3.42's (in your case) were optional. Pays to check this stuff out BEFORE buying parts : )


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     

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