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.

Turbo 400 cooler line fitting Size !!HELP!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 83ZZ502_Jimmy, Jul 11, 2001.

  1. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

    Joined:
    Feb 7, 2001
    Posts:
    3,103
    Likes Received:
    0
    Location:
    Richmond, VA
    I am retrofitting a turbo 400 into my Jimmy. I need to know what size the cooler fittings are. This is the only thing stopping me from firing it up. It is NPT or what?? Can anyone point me in the right direction?

    Many thanks in advance!!
    John

    '83 GMC Jimmy 4x4 ZZ4 Crate Motor
    '83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
    '94 Impala SS
    '01 Chevy 2500HD w/8.1L & Allison Auto
     
  2. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    It's been a lot of years since I installed my Turbo 400, but I think I used brake lines for the cooling lines. Look inside the fittings on the tranny and see if there isn't a slight cone-shaped rise inside. I'm certain that they aren't NPT. They're compression fittings (unless the fittings themselves have been removed from the tranny). It could be that the threads in the housing are NPT, then use an NPT to compression adapter.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
     
  3. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

    Joined:
    Feb 7, 2001
    Posts:
    3,103
    Likes Received:
    0
    Location:
    Richmond, VA
    Does 1/2" 20 sound about right. I got some different sized plugs and it was the one that fit the best.

    John

    '83 GMC Jimmy 4x4 ZZ4 Crate Motor
    '83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
    '94 Impala SS
    '01 Chevy 2500HD w/8.1L & Allison Auto
     
  4. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    Are there any fittings on your tranny right now or just threaded holes in the aluminum case? I'm pretty sure that there should be fittings screwed into the case. Then the cooling lines attach to those fittings. The holes in the tranny may be NPT, but the cooling lines themselves should use flared compression fittings.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
     
  5. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

    Joined:
    Feb 7, 2001
    Posts:
    3,103
    Likes Received:
    0
    Location:
    Richmond, VA
    you got it right. The fittings are in there, I have to screw the flare ends into them.

    Thanks,
    John


    '83 GMC Jimmy 4x4 ZZ4 Crate Motor
    '83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
    '94 Impala SS
    '01 Chevy 2500HD w/8.1L & Allison Auto
     

Share This Page