700r4 swap into Blazer question

Discussion in 'The Garage' started by Desert Rat, Sep 1, 2004.

  1. Desert Rat

    Desert Rat Fetch the comfy chair

    Joined:
    Oct 19, 2002
    Posts:
    16,250
    Likes Received:
    5
    Location:
    Tri-Valley, NorCal
    For anybody who has swapped out their TH350 for a 700r4, how much did you have to modify the transfer case lever to get it to work? My understanding is the 700r4 is 3-4" longer than the TH350 moving the TC back a bit. Did you modify the lever? Did you have to extend the hole in the floorboard farther back?
     
  2. 1979jimmy350

    1979jimmy350 1/2 ton status

    Joined:
    Mar 24, 2004
    Posts:
    3,070
    Likes Received:
    2
    Location:
    Ann Arbor Mi
    how you adapted the transfer case will play a big role in how far you have to move the lever did you use the output shaft or did you use a spacer?
     
  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    i think your backwards, sounds like he is taking out the th350 and putting in a 700r4.


    the 700r4 is 1.75" longer than a th350. you shouldn't need to move the shifter but lengthen the linkage. it should be within adjustment but if not, get the linkage from a 700r4/np208 or 241.
     
  4. Desert Rat

    Desert Rat Fetch the comfy chair

    Joined:
    Oct 19, 2002
    Posts:
    16,250
    Likes Received:
    5
    Location:
    Tri-Valley, NorCal
    Yep, pulling the TH350 and putting in most likely a Bowtie Overdrive unit. Good to hear it isn't that far back. I thought it was 3-4 inches longer.
     
  5. 1979jimmy350

    1979jimmy350 1/2 ton status

    Joined:
    Mar 24, 2004
    Posts:
    3,070
    Likes Received:
    2
    Location:
    Ann Arbor Mi
    are you using the orignal transfer case if you are you will need a spacer because the output shaft sticks out farther which would make the 700 even longer or you can swap in a short output shaft fron advanced adapters which will let you not use a spacer so then it would only be a inch or two longer
     
  6. Desert Rat

    Desert Rat Fetch the comfy chair

    Joined:
    Oct 19, 2002
    Posts:
    16,250
    Likes Received:
    5
    Location:
    Tri-Valley, NorCal
    Right now it has an NP205 on it. I called and spoke to BO OD and they told me when I order it (or if I have it built local), that during the rebuild they can put the appropriate short shaft in to match up with the 205.
     
  7. k5kev

    k5kev Registered Member

    Joined:
    Dec 25, 2002
    Posts:
    57
    Likes Received:
    0
    Location:
    Anaheim, CA
    Had a 700r4 put into my '72 w/ a 205. If you use the short tailshaft it'll be 1-3/4' or 1-7/8" longer (can't remember, I wanna say 1-7/8"). I didnt cut the floor, my tranny guy took a /forums/images/graemlins/weld.giftorch to the shifter and bent it into place. Now the shifter is shorter inside the cab. Good luck. /forums/images/graemlins/thumb.gif I have no regrets. /forums/images/graemlins/cool.gif
     

Share This Page