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14 bolt swap ????

Discussion in 'The Garage' started by seattle73k5, Oct 30, 2005.

  1. seattle73k5

    seattle73k5 1/2 ton status

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    I have just hung the 14ff under my rig checking the drive shaft length for fit, and it is to long???? how much of the slip yoke should be showing when installed this is without any weight on the rig the axle is hangging free so it is at full droop.

    Mine is all the way inside the transfer case so when I put weight on the truck it will have no room to move in anymore ???

    I thought that the drive shaft was a direct bolt on for a 14ff swap. Or should I be using ord 1 inch offset add-a-leaf to move the axle to the rear an inch?

    I pulled a 12bolt out and the truck has a 700r4 with an np208....

    any thoughts...I am wanting to weld the spring perches for the 14ff but I need to know the angle the shaft will be at....any thoughts...

    HELP :D
     
  2. muddybuddy

    muddybuddy 3/4 ton status

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    the pinion on the 14b is a little longer but not that much. where do you have the jacks to support the truck? if u have it on the axle then its gonna have all the weight on it.

    any pics?
     
  3. AKbigsub

    AKbigsub 1/2 ton status Premium Member

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    It is a direct swap if going from 14b SF to FF. 1/2 ton 12 bolt takes a longer drive shaft. Have a driveline shop build you a new shaft.
     
  4. muddybuddy

    muddybuddy 3/4 ton status

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    just get the shaft shortened a little, its alot cheaper than a new shaft...
     
  5. seattle73k5

    seattle73k5 1/2 ton status

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    the truck is supported by the frame and the axle is hangging without any weight on it.

    I do not have a problem with it being to short the problem is it is to long....the slip joint on the drive shaft is all the way in the transfer case and the drive shaft is sitting an inch behind the 14ff drive shaft flange.

    so the drive shaft is tooooooooo long. or am I not doing something right?
     
  6. muddybuddy

    muddybuddy 3/4 ton status

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    sounds too long, the slip yoke should have about 1.5-2" at the t-case when bolted up to the axle. just go get it shortened a couple inches and you should be fine.

    post some pics :D
     
  7. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    Yeah, 14bff pinions are longer than 1/2 ton stuff. I don't know the exact length of a slip yoke but I tried to line mine up with the way it sat before I messed with anything. Either have your shaft shortened or move the axle backwards.
     
  8. seattle73k5

    seattle73k5 1/2 ton status

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    what does it usually cost to shorten a drive shaft a few inches?
     
  9. muddybuddy

    muddybuddy 3/4 ton status

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    prolly around $50-75
     

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