1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

NP 241 Rebuild needed?

Discussion in 'Transfer Case' started by Daveo91Burb, Mar 18, 2018.

  1. Daveo91Burb

    Daveo91Burb Full Access Member

    Posts:
    512
    Likes Received:
    99
    Joined:
    Jul 6, 2014
    Location:
    Vancouver, WA
    First Name:
    Dave
    Truck Year:
    1991
    Truck Model:
    V2500 Silverado Suburban
    Engine Size:
    Vortec 383, modified TBI/4L80e
    My NP 241 will fall out of 4-Hi. I’ll be driving along in 4wd in snow and all of a sudden I’ll lose traction and realize it’s back in 2 hi. I think there are some plastic bushings on the shift forks that may be the culprit? Does this mean full rebuild? I have the t-case out now so it’s probably a good time. Everything else is OK except input and output seals. I was just going to do those and call it good, but now I’m thinking I should crack the case and at a minimum replace anything plastic or rubber.

    If there is agreement I should crack it open, any good advice on rebuild kits? I’m thinking the chain should not need replacement?
     
  2. HotRodPC

    HotRodPC Administrator Staff Member

    Posts:
    43,360
    Likes Received:
    2,896
    Joined:
    Aug 29, 2010
    Location:
    OKC, OK
    First Name:
    HotRod
    Truck Year:
    85
    Truck Model:
    Silverado K10 to K20 Conversion
    Engine Size:
    6.2 to Gas???
    I wonder if @crazy4offroad or @bucket might have a clue for certain. I'm sure not certain with that one. I've only dealt with ones that work and then explode or replacing seals and bearings, not diagnostics as of yet to much.
     
  3. bucket

    bucket Super Moderator Staff Member

    Age:
    37
    Posts:
    17,941
    Likes Received:
    2,982
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    I don't know much about the guts. But I know a linkage that's out of adjustment can cause that issue, as well as a bad trans mount.
     
  4. Daveo91Burb

    Daveo91Burb Full Access Member

    Posts:
    512
    Likes Received:
    99
    Joined:
    Jul 6, 2014
    Location:
    Vancouver, WA
    First Name:
    Dave
    Truck Year:
    1991
    Truck Model:
    V2500 Silverado Suburban
    Engine Size:
    Vortec 383, modified TBI/4L80e
    Hmmm, the trans mount IS bad, there’s a crack in it and new one on order. Maybe that’s the problem? It sure would be nice to not have to crack that thing open! Thanks for the input


    Sent from my iPhone using Tapatalk
     
  5. bucket

    bucket Super Moderator Staff Member

    Age:
    37
    Posts:
    17,941
    Likes Received:
    2,982
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    The shifter mounts to the body, so if the body moved too much in relation to the t-case, it can cause it to shift. But some movement is normal too, so if the linkage is out of adjustment, it can cause the same issue.
     
  6. Daveo91Burb

    Daveo91Burb Full Access Member

    Posts:
    512
    Likes Received:
    99
    Joined:
    Jul 6, 2014
    Location:
    Vancouver, WA
    First Name:
    Dave
    Truck Year:
    1991
    Truck Model:
    V2500 Silverado Suburban
    Engine Size:
    Vortec 383, modified TBI/4L80e
    Cool. Well I’ll replace the trans mount and adjust the linkage and keep my fingers crossed! thanks
     
  7. Daveo91Burb

    Daveo91Burb Full Access Member

    Posts:
    512
    Likes Received:
    99
    Joined:
    Jul 6, 2014
    Location:
    Vancouver, WA
    First Name:
    Dave
    Truck Year:
    1991
    Truck Model:
    V2500 Silverado Suburban
    Engine Size:
    Vortec 383, modified TBI/4L80e
    Just closing the loop on this one, finally got it resolved: simple case of linkage needing adjustment. I took the shifter console plate off so I could observe how it operated in the gate and saw that in 4-Hi the shift lever was bumping against the metal gate before it could go all the way into the detent. Super easy to remove the linkage and move the pinning point further down the linkage rod. Works like a charm now.

    Actually needed 4wd a few times this last week due to some minor snow on the roads. It kind of sucked to have to hold the t-case lever while driving.
     
    bucket likes this.
  8. rpcraft

    rpcraft Full Access Member

    Posts:
    997
    Likes Received:
    303
    Joined:
    May 31, 2016
    Location:
    Texas
    First Name:
    Robert
    Truck Year:
    1985
    Truck Model:
    Jimmy
    Engine Size:
    0.0
    I remember back on the np203 and it seems like on the np205 I thought the shifter was attached to the transfer case. I wonder why GM decided to go away from that? Was it a change after the body style updates?
     
  9. bucket

    bucket Super Moderator Staff Member

    Age:
    37
    Posts:
    17,941
    Likes Received:
    2,982
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    It was more modern and sophisticated. The shifter didn't move or shake as you drove the truck.
     
    rpcraft likes this.

Share This Page