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NP241C 4:1 conversion kit???

Discussion in 'The Garage' started by gmchevy, Jan 20, 2005.

  1. gmchevy

    gmchevy Registered Member

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    Does anyone know if a 4:1 kit has been made available for the np241c? I know that it is out there for the 241j but have not been able to locate any info. I am going the solid axle route on my '98 GMC when I get back from Iraq this december. I already have the Unimog axles and four inch springs for the front and Offroad Designs' four inch shackle flip. All I need is the 4:1 kit and the slip yoke eliminater. Anyone know anything 'bout this?
     
  2. stallion85

    stallion85 1/2 ton status

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    I've never heard of such kit. Where a re you in Iraq?
     
  3. gmchevy

    gmchevy Registered Member

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    Yea ive read about it for the jeep version 241 but not the Chevy, I am in North Carolina right now but I leave for I raq in about two weeks.
     
  4. sled_dog

    sled_dog 1 ton status

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    they only make them for the Jeep. Even then I don't think anyone sells a 241 4:1 there is just the 241 4:1 case from the Rubicon.
     
  5. gmchevy

    gmchevy Registered Member

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    I am dead positive that there is a kit out there for the 241J. I will have to see if i can find the article, i believe it was in petersen's
     
  6. sled_dog

    sled_dog 1 ton status

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    I know there is for the 231 but can't say I've located one for the Jeep 241.
     
  7. gmchevy

    gmchevy Registered Member

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    hopefully by dec there will be something available.
     
  8. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    If you are using mog axles do you really need 4:1 t-case gearing? You should have plenty of low gearing with that set-up...I take it this will be trail only?
     
  9. gmchevy

    gmchevy Registered Member

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    yes and no. minor road use but i want the slip yoke conversion
     
  10. sled_dog

    sled_dog 1 ton status

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    you can SYE without a 4:1 kit. I didn't notice you were going with mogs, I'd try without a lower transfer case gear ratio first.
     
  11. gmchevy

    gmchevy Registered Member

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    I think that i will be fairly close to stock gear ratio with 38's or 40's and the 6.32:1 mogs ( be like 35's with 4.56 ). I will still have a "decent" highway gear. and the 4:1 will be trail use only.
     
  12. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    That was Mepco or something making that kit. I talked to John at JB conversions about the 4:1 kit when we were doing the SYE kit article. He strongly recommended against it saying it wasn't strong enough in a full size application.

    Rene
     
  13. gmchevy

    gmchevy Registered Member

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    okay i guess i will just hang on to the 2.72:1 for now.
     
  14. CyberSniper

    CyberSniper 1/2 ton status Premium Member

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    There is no NP241J. There is a NP241OR which is the "Rocktrac" which is the transfer case out of the Rubicon. The case design is COMPLETELY different. I already researched it. A lot.

    All the NP231s and NP241s otherwise used the same gearset, selector system, et cetera. The inputs can be swapped also. The outputs can be swapped also. The main difference is that the NP231HD and NP241 had 6 pinion gears instead of 3. The NP231HD got a wider chain. The NP241 has bigger sprockets than the NP231. The NP241HD got a wider chain.

    The 4:1 kits they sell for Heep NP231s are double planetaries. I bet it'd survive a TBI smallblock with a 700R4. However, put a manual in front of it and it'll probably die. The gears are just too small and thin when you try to stick double planetaries where the original 6 pinions fit.

    NP241OR:
    [​IMG]

    NP231 is the far one and NP241 is the near one:
    [​IMG]
     
  15. gmchevy

    gmchevy Registered Member

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    Thanks, i guess i got some shopping to do.
     
  16. thebigdaddyof2

    thebigdaddyof2 1/2 ton status

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    Cyber,
    During your research, did you find out if the NP231 2WD Low Kit will fit and work OK in the 241C?

    I've never heard the answer to this question.
    todd


    QUOTE=CyberSniper]
    There is no NP241J. There is a NP241OR which is the "Rocktrac" which is the transfer case out of the Rubicon. The case design is COMPLETELY different. I already researched it. A lot.

    All the NP231s and NP241s otherwise used the same gearset, selector system, et cetera. The inputs can be swapped also. The outputs can be swapped also. The main difference is that the NP231HD and NP241 had 6 pinion gears instead of 3. The NP231HD got a wider chain. The NP241 has bigger sprockets than the NP231. The NP241HD got a wider chain.

    The 4:1 kits they sell for Heep NP231s are double planetaries. I bet it'd survive a TBI smallblock with a 700R4. However, put a manual in front of it and it'll probably die. The gears are just too small and thin when you try to stick double planetaries where the original 6 pinions fit.

    NP241OR:


    NP231 is the far one and NP241 is the near one:
    [​IMG][/QUOTE]
     
  17. thebigdaddyof2

    thebigdaddyof2 1/2 ton status

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    I found this at:
    http://www.teraflx.com/index2.htm
    Please order the appropriate part number for your vehicle:
    Low231 - 6 cyl. Wrangler and Cherokee manuals. (23-spline input)
    Low231A - 4/6 cyl. Wrangler autos. Same as Low231 with a TL621 seal extension.
    Low231-21 - 4 cyl. Wrangler and Cherokee automatics. Some 1987-’88 Jeeps® will require the 21 spline input gear for the Peugeot transmissions.
    Low231-23XJA - Cherokee 23-spline automatic.
    Note: Some Cherokees require one-quarter inch to be removed from the end of the input shaft in order to function properly. Please specify when ordering.
    241/242 t-cases: Call us for details on using our low-range gearing in 241 and 242 transfer cases.
    Brakes: A disc brake upgrade is ideal to improve braking with any low-range conversion.
     
  18. thebigdaddyof2

    thebigdaddyof2 1/2 ton status

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    And this 231 2WD low kit:

    teraflex NP231 2WD low kit.jpg
     
  19. 6.2Blazer

    6.2Blazer 1/2 ton status

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    The 241J (actually the 241OR) t-case only comes with a 4:1 kit and SYE, so there is no reason for any aftermarket "kit". Unfortunately I don't believe the 4:1 planetaries will work in the 241C case, nor have I seen a 4:1 kit for it.

    If you just want the SYE than several places sell them, including ORD, High Angle Driveline, Tom Woods, etc....
     
  20. HarryH3

    HarryH3 1 ton status Author

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    Also check out this old post: 241OR
     

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