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Transfer Case Swap

Discussion in 'Wrangler TJ (1996-2006)' started by bigdawg, Dec 10, 2017.

  1. Dec 10, 2017 at 5:26 AM
    #1
    bigdawg

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    bigdawg [OP] Member

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    2” lift , front and rear lockers and 33’s
    Has anyone replaced the stock transfer case in a 98 TJ with a GM NP205? And if so, what kind of fabrication had to be done?
     
    bigdawg, Dec 10, 2017
    #1
  2. Dec 10, 2017 at 8:14 AM
    #2
    Bob

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    Bob Well-Known Member Moderator

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    231 -> 205 seems to be a popular swap but I can't find any info on what you'd need to fabricate to make it work
     
    Bob, Dec 10, 2017
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    JKBob 25 and chris4x4 like this.
  3. Dec 10, 2017 at 8:22 AM
    #3
    bigdawg

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    bigdawg [OP] Member

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    2” lift , front and rear lockers and 33’s
    Thank You
     
    bigdawg, Dec 10, 2017
    #3
  4. Dec 10, 2017 at 6:42 PM
    #4
    JKBob 25

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    JKBob 25 Well-Known Member

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    JKBob 25, Dec 10, 2017
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  5. Dec 10, 2017 at 7:02 PM
    #5
    OFFGRID

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    OFFGRID Well-Known Member

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    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    The NP205 is a great Tcase. Novak adapter to mate it. New drive shafts. Make sure you get the NP205 that drops on the correct side: driver drop or passenger drop. I can't remember which side the TJ is on. I assume you will twin stick it so you will need new cable shifters. I would say run the numbers and see how much you think you are going to spend. I bet you will be pretty close to the cost of an Atlas. I have built 2 Tcases for my CJ I tricked out the Dana20 ($1200) and I also tricked out a NP208 ($1050). Both almost cost me as much as an atlas. I should have bought the Atlas. I will wheel the 208 until it craps out and by an Atlas next.
     
    OFFGRID, Dec 10, 2017
    #5
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  6. Dec 10, 2017 at 7:07 PM
    #6
    JKBob 25

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    JKBob 25 Well-Known Member

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    There he is. Lol.
     
    JKBob 25, Dec 10, 2017
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  7. Dec 11, 2017 at 4:30 AM
    #7
    bigdawg

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    bigdawg [OP] Member

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    I’m probably going to limp though the winter while I save for the atlas
     
    bigdawg, Dec 11, 2017
    #7
  8. Dec 11, 2017 at 2:33 PM
    #8
    bigdawg

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    bigdawg [OP] Member

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    2” lift , front and rear lockers and 33’s
    A friend is telling me that a 242 will bolt right in. Is that correct and is it a beefier unit?
     
    bigdawg, Dec 11, 2017
    #8
  9. Dec 11, 2017 at 3:07 PM
    #9
    OFFGRID

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    OFFGRID Well-Known Member

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    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    I don't believe there is much difference. Is there something wrong with your 231? If so rebuild it. What is your goal? Is this mainly a daily driver? Is it mainly an off-road vehicle? Are you looking for better off-road performance? Answer me this and then you can better choose what you need.
     
    OFFGRID, Dec 11, 2017
    #9
  10. Dec 12, 2017 at 3:57 PM
    #10
    bigdawg

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    bigdawg [OP] Member

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    Just repaired the 231 for now. It’s a daily driver that I like to take out and have fun with. And when I’m out having fun I don’t like having to baby it because I’m trying not to break something.
     
    bigdawg, Dec 12, 2017
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  11. Dec 12, 2017 at 5:16 PM
    #11
    OFFGRID

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    OFFGRID Well-Known Member

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    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    the 231 is a good tcase. if i were to replace it it would be with tj rubicon tcase. gets you a 4:1 low gear and it is a direct swap.
     
    OFFGRID, Dec 12, 2017
    #11
  12. Dec 13, 2017 at 6:29 AM
    #12
    Southeast Overland

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    Southeast Overland Well-Known Member

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    Looks like retail price on that Atlas is about $2500 with everything needed to put it in a TJ.

    I am in the same boat with my rig 231 is still holding up well for right now though. You can even swap the chain and 6 gear planetary gear over from a Chevy 231 (If I remember that right) if you are concerned about just strength.

    ~Jeff
     
    Southeast Overland, Dec 13, 2017
    #12
  13. Dec 13, 2017 at 9:02 AM
    #13
    bigdawg

    #13
    bigdawg [OP] Member

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    2” lift , front and rear lockers and 33’s
    I am going to try and get the money together for an Atlas by spring.
     
    bigdawg, Dec 13, 2017
    #13
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