Manual Swap, Transfer Case and Driveshaft Question

Discussion in 'Transfer Cases' started by Bret, Feb 19, 2019.

  1. Bret

    Bret Newbie

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    I've got a 1995 4x4 NV4500 to swap into my 1999 Suburban 4x4, so I wanted to see if anyone could help me fill my holes here.

    My vehicle:
    1999 2500 Suburban 454
    4L80E, 14 bolt FF, NP241 TC

    NV4500 Donor:
    1995 ECLB 2500 350
    NV4500, 14 Bolt SF, NP241 TC

    I know my driveshaft will be a little bit too short due to the 4L80E being longer than the NV4500. I'm assuming it will be too much of a difference to reuse the driveshaft. I know a 4L60E is the same length as an NV4500.

    I know one option is having the driveshaft lengthened at a shop.

    My big question is if I were to go to a junkyard and find a good condition California drive shaft from either a RCLB(same wheelbase as suburban) 4x4 or another suburban 4x4, does it have to be a 2500 with FF 14 bolt and 4L60E? Would a 1500 have the same transfer case output shaft and rear differential yolk? And lastly, if they are not, could I grab a proper length drive shaft from a 1500 and put my 2500 yolks on it?

    Sorry if the post seems a little confusing, but I just want to see all my options here and what you guys suggest as being best for this swap. Couple hours of googling and searching didn't show me too much of what I was looking for. None of this is quite as big a deal for the front drive shaft, since any GMT400 2500 4L60E front shaft should work.
     
  2. BlastingBat998

    BlastingBat998 Newbie

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    Just to play it safe i would try to find a RCLB w/ 4L60E K2500 w/14BFF, they are in fact the same length and IIRC the 14BFF found in 2500 8lug trucks has different yolks compared to the 2500 14BSF/6lug. hope this helps.
     
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  3. Bret

    Bret Newbie

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    Sounds like a pretty rare combo, can't say I've ever seen a 4l60E with a 14Bff behind it. But you responding prompted me to do more research. Going off Dorman's website, Looks like a K2500 Burb/RCLB with 4l80e is 61.5" Driveshaft, while a 4l60e Burb/RCLB or NV3500 RCLB uses a 63.125" Driveshaft. 1.625" shorter doesn't sound like a huge difference, but I don't know if I'd want to play around with something like that, especially if I lift it. All the drive shafts were the same diameter, so I'm thinking my best bet will be to cut a couple inches up the diff side of a 14FF driveshaft yolk at the junkyard and take that and my original shaft to a drive line shop and have them lengthen it that way.
     
  4. BlastingBat998

    BlastingBat998 Newbie

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