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What have I got???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by J.C.Staley, Sep 3, 2001.

  1. J.C.Staley

    J.C.Staley Registered Member

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    Ok gurus, I need your help. Just got the 305 replaced with a 350 and boy is it nice. I found the options sheet on the fender well and it says; "Option No. 1GQI Rear Axle - Standard". What is this telling me? The 350 went in with an RV cam, Headman Headers, Edelbrock high performance intake manifold and Edelbrock high performance Carb. Also new exhaust system with flowmaster and three inch pipe. Soon to be followed with a new set of plug wires from Summit. Boy is it clean and compared to the 305 it's a powerhouse. Just got the first 500 miles on it with 150 of those in the mountains of western Wyoming grouse hunting. I can't beleive the power difference. I can't quit smiling.
     
  2. RedDwarf

    RedDwarf 1/2 ton status

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    What year is the truck?

    Lift It, Lock It, LIVE IT!!!
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    When the my 305 was kicked to the curb for a 350 I had the same feeling. The factory 305's are dogs. It's nice to be able to pass, and accelerate up hill.
     
  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I checked my RPO code book and it says the same thing - standard axle ratio. My guess it would have the 3.08 gears.

    BTW, my code book lists the code as "GQ1".

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  5. J.C.Staley

    J.C.Staley Registered Member

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    Damn you guys are fast!!! You're right the code is GQ1. It is an 84 K5. I was sure hoping you'd tell me they were 3.73 gears. Looks like that might be my next major project. Don't tell my wife she's still in shock over the engine.
     
  6. DesertDueler

    DesertDueler 1/2 ton status

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    3.08s arent that bad. I still have 3.08s and run 35s.


    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  7. thatK30guy

    thatK30guy 1 ton status Premium Member

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    A buddy of mine ran 33's with 2.73 gears once! Yeah, thats no misprint - thats what you read - 2.73 gears!!! And, he ran those gears with that tire size on a 305, 700R4, and NP208!!! It got around town wherever he wanted to go! [​IMG]

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Hey DD, try out a set of 4.11's and 35's and then go back to your 3.08's and say that they're not too bad.[​IMG]

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  9. DesertDueler

    DesertDueler 1/2 ton status

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    Ive got the 208 transfer case so it isnt bad. I can also cruise at 95 in overdrive with no problems, and dont suck alot of gas crusing that fast. Now my blazer is strickly a rockcrawler I am putting in 4.56 gears.

    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  10. J.C.Staley

    J.C.Staley Registered Member

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    I'm running 33's. The one problem I noticed this week was that it didn't like runnin' in over drive. Kept shifting down at the slightest incline. It did that with the 305 and I had hoped it would go away with the 350. What little climibing in the hills I did I had no problem at all and a couple would have been tough with the 305. Even if I change gears it won't be until next year.
     
  11. RedDwarf

    RedDwarf 1/2 ton status

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    My book lists the standard axle ratio for gas engines in 84 Blazer as 2.73 :1
    but I don't have the option code listed.

    3.08 is listed as standard for the diesel.

    Lift It, Lock It, LIVE IT!!!
     
  12. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Downshift out of the O.D. to D and leave it there. It will drive like it has lower gears, but not much.

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  13. J.C.Staley

    J.C.Staley Registered Member

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    Hey thatK30guy here's some more. The optioni list has the transmission listed as a "VO2 H.D. TRansmission OI" and "MXO 4-spd Auto Transmission". Any more info availabe.
     
  14. thatK30guy

    thatK30guy 1 ton status Premium Member

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    My code book dont say which ratio either. [​IMG]

    Guess the only and best way to check is to take the cover off the differential and look for the stamped numbers and divide them to get the ratio.

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  15. thatK30guy

    thatK30guy 1 ton status Premium Member

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    VO2 is the "radiator, HD with trans. oil cooler".

    MX0 is "merchandised trans, auto provisions, o/d".

    The VO2 sounds like the 4-core radiator.

    The MX0 sounds like the 700R4 tranny.

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  16. RedDwarf

    RedDwarf 1/2 ton status

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    Well, if the code says standard, and the standard ratio is 2.73, then I guess it has 2.73 gears.

    MXO is just the code for the 700R-4 auto

    Seems like they could do better than 2.73 gears with the 700 overdrive, but they did some stupid sh1t in the 80's with gearing. Heeps came with O/D and 2.73's

    Wes is right in the end, though. The only way to know for sure is to get in there and count the teeth.

    Lift It, Lock It, LIVE IT!!!
     
  17. J.C.Staley

    J.C.Staley Registered Member

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    Thanks Wes. Appreciate the inof.
     
  18. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Well the way to be 100% sure is to pull the pumpkin cover or jack the rear up and spin the tires. The messy way is to pull the pumpkin cover and look at the ring gear. Somewhere on it will be two pairs of numbers together. On my 12-bolt it says 41 11 and 41/11 is 3.73. Or you can jack the rear of the truck up so both tires are off the ground. Then put the truck in neutral and watch your driveshaft. What you do is grab a tire and spin it around two complete revolutions while watching the driveshaft yoke. If you have 3.08 gears your yoke will have gone around 3 times. I hate my 3.08s and can't wait to get my 3.73 12-bolt in. You can run 3.08s and big tires but its not smart. Your motor will run WAY below its power band and have to lug when its rolling. Automatic transmissions don't appreciate this heavy load and frequently over heat and have other problems.

    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     

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