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factory gears

Discussion in 'The Garage' started by win717, Jan 31, 2004.

  1. win717

    win717 Registered Member

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    Anyone running factory rear gears in there blazer?
    I have a 79 blazer 205 transfer case 4 spd..with as far as i know factory rear gears,,1st 2nd gear is fine but i hot 3rd it stumbles can hear the valves taping it jerks....once i get her going pretty good it seems better..but as soon as a hill comes up I need to shift into 2nd before i hit the top..not sure if my rear gears are to high or i should look for something else
     
  2. win717

    win717 Registered Member

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    anyone??
     
  3. bablazer73

    bablazer73 1/2 ton status

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    What size tires are you running? do you know what the gears are?
     
  4. 75-K5

    75-K5 3/4 ton status

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    It depends on your tire size. If you're running stock 31" tires, your gears will be fine. Stock is usually 3.07 for the 12 bolts and 3.08 for the 10-bolts. I think 79's have the 10-bolt.
     
  5. win717

    win717 Registered Member

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    I'm running 33s with 4inch lift, gears..really don't know..i was just told that they were factory..when it warms up around here i can get under it and found everything out
     
  6. bablazer73

    bablazer73 1/2 ton status

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    If I had to guess, You probably have 3.08's. So with the larger tires, I'm not surprised you have to down shift. I have 3.73 and 33's on my 76. Most of the time it's fine, But there is one hill by my house That i have to downshift for. My 87, with 31's and 3.08 Can't climb anything without downshifting! Both these trucks are 350ci, 4spds.
     

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