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Figure out My splines?

Discussion in 'The Garage' started by broncoman6524, Apr 12, 2006.

  1. broncoman6524

    broncoman6524 1/2 ton status

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    Im trying to figure out what gears i need for my axles (i think im gonna go with 4.11s) But i dont know whrether my axles have 28 or 30 splines.

    From the factory it was a k5, 305/700r4, 10 bolts w/3.08

    i now run a 350 soon to be 383 th400 and still 10 bolts w/3.08s

    my question is would this be a good gear ratio and how do i figure out what splines i have?

    thnx
     
  2. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

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    What year truck
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    If your rig is an 84 it will have 28 spline unless someone has changed it to 30. If you install a 400 you're losing the OD so i would say that 4.11's would be a good choice but that depends on what size tire you're running.
     
  4. Masiony

    Masiony 1/2 ton status

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    GM went to 30 spline in 88. everything earlier was 28 factory.
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Actually 30 spline started in 1989.
     
  6. Masiony

    Masiony 1/2 ton status

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    what ever, 88, 89 they were both crappy years :D
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    From what i've heard the 28 splines are stronger than the 30 splines in the fact that in order to increase the spline count from 28-30 the carrier was bored larger which means less material in the critical area. Doesn't matter to me anyways since i'm running 1 ton stuff under my rig but for those with stock 1/2 ton stuff they may want to know. :thumb:
     
  8. Masiony

    Masiony 1/2 ton status

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    ive never heard that. 30 spline is obviously a hair larger, and theoretically stronger, but your arguement is probably valid too. doesnt matter for me either, ive got a 60/14 too.
     
  9. rick88blaze

    rick88blaze 1/2 ton status

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    Hey now, I've got an '88!!! :mad:

    j/k I've had my fair share of problems with it.

    2 trannies and the rear axle went out, but that couldn't have had anything to do with the way I drive. :D

    It is running strong now. :D

    Rick
     
  10. Masiony

    Masiony 1/2 ton status

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    Cracked Heads, Every Valve Rotten, Oil Leaks, Engine Ticks

    ive got an 85 K5, i would know
     
  11. rick88blaze

    rick88blaze 1/2 ton status

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    :haha: :haha: :haha: :haha: :haha:

    I haven't heard that one before.

    Rick
     
  12. broncoman6524

    broncoman6524 1/2 ton status

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    ya its an 84 and i've already got the 400 in after a month i needed a new tranny...bought it thinkin it needed a new trans pan seal... NOT :rolleyes:

    So 4.11's would be good gears for a truck runnin 33 A/t and mostly sees mud and sand?
     
  13. Masiony

    Masiony 1/2 ton status

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    yeah. with an OD tranny you would want deeper, but you will be fine with a 400.
     

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