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Thick or thin gears?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by pomai, Feb 15, 2005.

  1. pomai

    pomai 1/2 ton status Premium Member

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    I have a 14 blt ff, 4.10 gears with an oper carrier from a 1980 chevy 1 ton truck that I will be installing into my 88 Blazer. I want to install 4.56 gears. How can I tell if I need thick or thin gears. Thanks Ed
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Well according to this , you need a new carrier for 4.56 , so I say you need thick gears to use your carrier .

    [​IMG]
    14-7/8 x 13"
    14 HOLES
    Irregular Gasket Pattern

    SPECIFICATIONS
    • RG Diameter 10.5"
    • 12 9/16 X 18" RH Threaded Bolts
    • PINION Diameter 1.75", 30 Spline CASE: 4.10 & Numerically Lower, 4.56 & Numerically Higher

      8620 Material Heat-Treated

      Assembly Specifications:
    • Cover Bolt Ft. Lbs. 20
    • Pinion Brg. Preload In. Lbs 20-25
    • Pinion Brg. Preload In. Lbs 10-15 Used
    • Ring Gear Backlash .005-.009
    • Ring Gear Bolt to case Ft. Lbs. 105
    • Side Brg. Caps Ft. Lbs. 100
     
  3. sled_dog

    sled_dog 1 ton status

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    thick gears. DOn't bother looking for a new carrier. Thick gears are easier to find than thin so the best 14 bolt combo is 4.10 down carrier with thick gears.
     
  4. BurbLover

    BurbLover 1/2 ton status

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    Not to mention thick gears are usually cheaper than the thin ones.
     

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