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driveshaft length?

Discussion in 'The Garage' started by Disciples Performance, Jun 23, 2006.

  1. Disciples Performance

    Disciples Performance 1/2 ton status

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    hey guys when i get my 14 bolt FF into my K5 will i need to shorten my driveshaft and if so how much???
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Too many variables to be able to give you an answer. You will need a conversion U-joint though.
     
  3. K5er4Life

    K5er4Life 1/2 ton status

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    This is true, but I do believe you will end up lengthening your drive shaft. The pinion nose on the 14 bolt is actually a little bit shorter than your 10 bolt (I assuming 10 bolt) This is so because the 14 bolts have a pinion assembly that bolts to the front of the case. A long time ago I took some measurements from my 10 and 14 bolt and the 14 ff turned out to be almost 1 inch shorter from yoke to center of axle tubes.
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Actually the 14ff pinion nose is longer than a 10 bolt.
     
  5. goldwing2000

    goldwing2000 Guest

    When I did my swap (from a 12-bolt), I also rotated the pinion up and I ended up getting about 1.5" removed from the d-shaft.
     
  6. perp

    perp 1/2 ton status

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    I never had a length issue after the swap.
     
  7. K5er4Life

    K5er4Life 1/2 ton status

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    As you can see already, far too many variables too predict. BTW my d-shaft needed shortening, but that was because it came out of a long bed pickup.:D
     
  8. onlychevy6

    onlychevy6 1/2 ton status

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    i had a 12 bolt in mine just put in the 14 bolt ff and have not changed a thing. of course i have not put in the 6 degree shims either.
     
    Last edited: Jun 23, 2006
  9. blackblazer717

    blackblazer717 1/2 ton status

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    i say it depends on a few things
    what tranny
    what lift
    did you move or change the rear spring length or position
    hummmmmm

    LUKE
     
  10. Chaddy

    Chaddy 1/2 ton status GMOTM Winner

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    I added an inch to the drive line after the swap
     
  11. Hossbaby50

    Hossbaby50 3/4 ton status

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    I am pretty sure when I measured the 10 bolt vs 14bff when I did my swap the 14bff pinion was about 1" longer then the 10 bolt.

    I didn't have to modify my driveshaft at all when I installed my 14bff. My combo is a stock driveshaft with 700R4/208 slipyoke setup. My tcase is shimmed down a little to help with vibs.

    Harley
     

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