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What gearing do I have?

Discussion in 'The Garage' started by IL84JIMMY, Apr 13, 2004.

  1. IL84JIMMY

    IL84JIMMY Registered Member

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    I drive an 84 Jimmy, stock with a rebuilt 350. I dont really konw what the owner before me did to it. How can i know what gearing i have. The truck is a manual with granny gear and then the three speed. When i am running on the highway at 60, my rpm's are at like 2200. Thanks
     
  2. 55Willy

    55Willy 3/4 ton status

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    how tall are the tires?
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    jack up the rear of the truck and turn the tire one full revolution and count how many times the drive-line makes a full revolution. drive-line turns 3 and 3/4 turns 3:73's 4 and 1/4 turns 4:10's
     
  4. TXsizeK5

    TXsizeK5 1/2 ton status

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    wouldn't you have to turn the tire two revolutions if it is an open diff?
     
  5. IL84JIMMY

    IL84JIMMY Registered Member

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    tires are just 29 inch AT's for daily driving
     
  6. 55Willy

    55Willy 3/4 ton status

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    3.08's
     
  7. heavy4x4

    heavy4x4 1/2 ton status

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    Using the calculators at www.4lo.com I come up with you having 3.08 gears (assuming the numbers you gave us are accurate).
     
  8. 55Willy

    55Willy 3/4 ton status

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    thats where i went. I love thier alcohol level calc. too,LMAO
     
  9. R72K5

    R72K5 Banned

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    well 350 wouldnt be in the truck from factory,

    if your SPID label says GQ1 standard axle then youre gonna have to pull diff cover and look on the very edge of the ring gear it will have teeth count(of pinion and ring both- divide these to get the axle ratio) stamped into it along with date and ring gear part number or find stamping code on RH axle tube and call chevy parts counter with the code and year make model of the truck,

    in 84(10 bolt 8.5") it can be 2.73, 3.08, 3.42, 3.73



    good luck
     

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