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.

tranny swap help

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 82K20, Jun 4, 2003.

  1. 82K20

    82K20 Newbie

    Joined:
    Apr 18, 2003
    Posts:
    4
    Likes Received:
    0
    Location:
    Indiana
    I have an 83 K20 that I am building...it had an SM465 with an NP208....I want to know what I can do here, I have a TH400, how can I use this trans with the NP208? Or what about a 700R4? I have a 700 but no output shaft or adapter. Anyone know what my options are here and or what mods I can expect as far as drive shaft lengths? Thanks!
     
  2. BlazerGuy

    BlazerGuy 3/4 ton status

    Joined:
    Apr 20, 2000
    Posts:
    9,206
    Likes Received:
    0
    Location:
    abcde
    You will have to find an adaptor for the 208 to work with those trannys. Finding the 700/208 should be very easy as most of the 80's trucks have this combo. The 400/208 adapter will be more difficult because the only truck that came with that combo were M1008 CUCV's(Military K30).
     
  3. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

    Joined:
    Feb 7, 2001
    Posts:
    3,103
    Likes Received:
    0
    Location:
    Richmond, VA
    The adapter can be found in all K20's with the 400 and 208. Not just the miliary vehicles.

    There are two versions of this adapter. The tall one and the short one.
    You will have to find a tall one to fit your current crossmember. A short one can be be used but you will need the "double hump" crossmember from a 85 and newer truck.

    Swapping the 400 for the 465 is a direct bolt in. Same length as your current combo. No driveshafts will need to be modifed and you can use your current case. I have done this swap before.

    If you do want to go with a 700R-4, you will need a 208 with a 27 spline input. Easy to find normally. This again is the same length as your current setup. The adapters make up for the difference. Driveshafts will not need to be modified.

    Hope it helps,
    John
     

Share This Page