Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

tranfer case question?

Discussion in 'The Garage' started by lunchbox, Oct 24, 2006.

  1. lunchbox

    lunchbox 1/2 ton status

    Joined:
    Jan 22, 2006
    Posts:
    309
    Likes Received:
    0
    Location:
    novato,california
    first the rear end now a blown up transfer case, ive had a bad month. i just blew up my transfer case and im gonna go to the pick and pull tommorow, what should i be looking for? one out of a suburban? or another blazer?
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    Need the year of your rig! :)

    (fill out your profile, some us actually check that if it's not in the post hint, hint) A signature line also works.
     
  3. lunchbox

    lunchbox 1/2 ton status

    Joined:
    Jan 22, 2006
    Posts:
    309
    Likes Received:
    0
    Location:
    novato,california
    soory about that. Its an 87 gmc jimmy with a 305 and a 700r4.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    I believe any GM 1/2 or 3/4 ton from 1989 down to 1981 will have a case you can use. Someone will correct me if that's wrong.

    You should have an NP208 case in there now, I believe the mechanical speedometer NP241's will bolt straight in as well. (again IIRC, 1988-89) They are more desirable than the 208, but if you can't find an NP241, I wouldn't cry. :)

    You COULD use one from a 1990 or 1991 truck of the same body style you have (not the '88+ bodied trucks) but that will have the electronic speedometer, making you change a few things around.
     
  5. dremu

    dremu Officious Thread Derailer Premium Member

    Joined:
    Feb 27, 2000
    Posts:
    15,958
    Likes Received:
    452
    Location:
    East of San Francisco
    Should then have an NP208. Any 4WD Chebby from that year would work -- Burb, Blazer, pickup, all use the same t-case ... as to which other years, someone else will pipe up.

    I know that by '90 the NP241 was in use, with the digital speedometer (VSS, DRAC) stuff, so you'll want to avoid that to keep your swap plug-n-play.

    -- A
     
  6. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,553
    Likes Received:
    939
    Location:
    Massachussetts
    My theory..

    I try to get tranny and transfer cases from 1/2 tons,figuring they would be less likely to have been hauling lots of weight or abused...see if the donor truck had a class 3 trailer hitch,that means it was hauling a camper,or other heavy loads,and the drivetrain might be beat!...the worst trucks to use parts from are ones owned by contractors,1 tons especially..they get beaten by employees,and are often overloaded and neglected..but we need 1 ton parts,and sadly,there just isn't many to choose from here...:crazy:
     
  7. lunchbox

    lunchbox 1/2 ton status

    Joined:
    Jan 22, 2006
    Posts:
    309
    Likes Received:
    0
    Location:
    novato,california
    that makes sense, so the transfer cases were the same in 1 tons and 1/2 tons?
     
  8. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    yep, 81-89, 90-91 have electric speedo. the 700r4 and th350 versions have a 27 spline input. the sm465 and th400 versions have a 32 spline input. i have seen a few 4 speed overdrive manual trannys, these have a 27 spline also.
     
    Last edited: Oct 24, 2006
  9. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    the 1 tons have a np205, they won't bolt into your truck. the 1/2 ton and 3/4 ton are the same though.
     
  10. lunchbox

    lunchbox 1/2 ton status

    Joined:
    Jan 22, 2006
    Posts:
    309
    Likes Received:
    0
    Location:
    novato,california
    so i could find one in a suburban?
     
  11. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    yep
     
  12. lunchbox

    lunchbox 1/2 ton status

    Joined:
    Jan 22, 2006
    Posts:
    309
    Likes Received:
    0
    Location:
    novato,california
    how hard of a project is replacing the t-case, any tips?
     
  13. 1979jimmy350

    1979jimmy350 1/2 ton status

    Joined:
    Mar 24, 2004
    Posts:
    3,069
    Likes Received:
    0
    Location:
    Ann Arbor Mi
    its not that bad with the newer cases they are no where near as heavy, you have to remove the shifter, drive shafts and then unbolt the transfer case from the adapeter, its not to bad at all
     
  14. twoslo4five0

    twoslo4five0 3/4 ton status Premium Member GMOTM Winner

    Joined:
    Oct 5, 2006
    Posts:
    6,614
    Likes Received:
    71
    Location:
    Living in a dump, VA
    better know your transimittions though...mine might be a rarety but i got an 87 burb with a f/i 350 but it has a turbo 400/208....is this a rarety to find?
     
  15. dremu

    dremu Officious Thread Derailer Premium Member

    Joined:
    Feb 27, 2000
    Posts:
    15,958
    Likes Received:
    452
    Location:
    East of San Francisco
    Nah, the 3/4 Burbs have the TH400, and through '87 would have the 208.

    My '90 Burb had a TH400 and a '241.

    -- A
     
  16. lunchbox

    lunchbox 1/2 ton status

    Joined:
    Jan 22, 2006
    Posts:
    309
    Likes Received:
    0
    Location:
    novato,california
    so my dad and i went back to where i broke down and we tried to pullit home with his truck, the thing wouldnt budge, it was dragging the front tires . we had put the tranny and t-case in nuetral and the thing wouldnt move, and when i called the tow company they said they couldnt help. what does this sound like and how the heck am i gonna move this?
     
  17. 1979jimmy350

    1979jimmy350 1/2 ton status

    Joined:
    Mar 24, 2004
    Posts:
    3,069
    Likes Received:
    0
    Location:
    Ann Arbor Mi
    if the transfer case is locked up pull the drive shafts, just remember though that you will not have park so use the parkign brake so it does not roll away
     
  18. goldwing2000

    goldwing2000 Guest

    Yeah, sounds like you grenaded enough parts inside the t-case to lock everything up. Good job! :waytogo:

    Just disconnect the driveshafts from the axles and tie them up to the bottom of the truck. If you pull the rear shaft completely out, you're going to be dribbling fluid all the way home.
    And don't lose the hardware. :D

    Leave the tranny in park and the t-case in neutral, so you can start the engine and have brakes.
     
  19. lunchbox

    lunchbox 1/2 ton status

    Joined:
    Jan 22, 2006
    Posts:
    309
    Likes Received:
    0
    Location:
    novato,california
    so it doesnt sound like any of this hurt my tranny did it?, its just the t-case?
     
  20. bigred81

    bigred81 1/2 ton status

    Joined:
    Dec 5, 2003
    Posts:
    323
    Likes Received:
    0
    Location:
    Falls City,TX
    From what it sounds like the planetiary in the transfer case exploded I have seen this several times with rigs that were wheeled hard or run out of oil. pull all the drive shafts and put them in the truck.

    bigred81
     

Share This Page