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Thread: Transfer case

  1. #1

    Default Transfer case

    Hi everyone!

    I have a 1988 K2500 with the 6,2 diesel and hillbilly 3 spd manual tranny (actually L-1-2-3). As far as i know, the K trucks from around -87-88 have the NP241 transfercase and the earlier with 4wd had the NP205 for part-time 4wd and the NP203 for full time 4wd. Am I correct? And does the 205 and 203 interchange with my 241? I think they should cause the main tranny and the frame mounting points havenīt changed since earlier years, have they? Maybe someone of you guys know better.

  2. #2


    Give Advance Adapters a call. They'll be able to answer all your questions. Your hillbilly 3 speed is actually one of the best manual tranmissions ever put in a light duty truck. The SM465 was first used in 1968 and used in everything from 1/2 ton pick-ups to 2 ton dump trucks. Keep it, any other tranny you would swap in will be a downgrade in strength.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

  3. #3


    Do you have IFS or a solid front axle? The 203 and 205 (and 208) are pass side drop only, which means you cannot use them on and IFS truck. The 241 is a great case anyway, no need to change it.
    When you hear hoofbeats, look for horses not zebras.

  4. #4


    Iīve got IFS so then thereīs no need for further plans. I wanted the center differential cause with the solid transfercase it will go almost straight forward in tight corners when snowy or icey roads. I was gonna use the HI-Lock mode and disengage my font axles for normal 2wd driving, but i did some research and found out that the case will take damage with the center diff locked for longer time so it wouldnīt have been a good idea anyway. Thanx for the replies any way! And by the way, there wasnīt ever a thougt about changing the 3 spd.

  5. #5


    A full time case would be nice, especially for snowy regions. A decent halfway mod is to install a Posi-Lok in the front axle, or a "dildo" for the winter months. That allows you to get truly instant 4wd with the lever/dash button.

  6. #6


    The traction is not the problem. The traction is great when in 4wd. But when i have some load on the bed, the rear wheels get better traction than the front wheels wich means the front wheels spinns a little to slow in corners, making the truck tending to slip straight forward. A case with center diff would solve this problem but since itīs not an option Iīll go on with my 241. I use to slide the lever into 2wd when getting to corners and pull it back into 4wd after Iīve gone through the corner. Works fine that way to. Iīve relocated the front axle actuator switch to the dash, so the actuator doesnīt have to go off and on, off and on all the time.
    Case closed. Thanx for replies!

    ---------- Post added at 12:11 PM ---------- Previous post was at 12:06 PM ----------

    Ps. Maybe better tires than my 35" Kumho "slicks" would make a difference.

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