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.

Transmission Line Question

Discussion in 'The Garage' started by broc944, Nov 5, 2006.

  1. broc944

    broc944 1/2 ton status

    Joined:
    Sep 23, 2005
    Posts:
    1,660
    Likes Received:
    0
    Location:
    Northern Minnesota
    I have a leak in my rubber line between the radiator and aftermarket transmission cooler. I want to use braided stainless steel lines, but need to figure out the size of fittings I need to order.

    The questions I have are:

    1. What is the size of the fitting that screws into the radiator?

    2. Would -AN6 be the correct size braided line to use for a replacement?
     
  2. dremu

    dremu Officious Thread Derailer Premium Member

    Joined:
    Feb 27, 2000
    Posts:
    15,952
    Likes Received:
    443
    Location:
    East of San Francisco
    I *think* the fitting in the radiator is 1/4" NPT... just pulled mine, and it looked like that.

    I donno 'bout the line size.

    -- A
     
  3. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

    Joined:
    Nov 29, 2005
    Posts:
    2,747
    Likes Received:
    3
    Location:
    Harrison City, Pennsylvania
    Line size is -6 (3/8"). The fitting is not pipe thread, is is a double flair like brake fittings.
     
  4. dremu

    dremu Officious Thread Derailer Premium Member

    Joined:
    Feb 27, 2000
    Posts:
    15,952
    Likes Received:
    443
    Location:
    East of San Francisco
    I stand corrected. I will be careful with my brass fittings then and not try and put NPT's on there. (Come to think, it looked finer threaded than pipe.)

    -- A
     
  5. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

    Joined:
    Nov 29, 2005
    Posts:
    2,747
    Likes Received:
    3
    Location:
    Harrison City, Pennsylvania
    I think you'd need a 5/16" flair to -6 adapter from Earls. Or... you could call Summit and they'll tell you what you need.:)
     
  6. ntsqd

    ntsqd 1/2 ton status

    Joined:
    Nov 28, 2002
    Posts:
    3,381
    Likes Received:
    0
    Location:
    So. CA
    Can also get such an adapter from an industrial hydrualics supplier.
     
  7. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,537
    Likes Received:
    922
    Location:
    Massachussetts
    line size..

    MOST tranny lines are 5/16",with fittings that have 1/2"x20 threads...some heavy duty TH400's I've seen used 3/8" lines with 5/8x18 threads..

    I hate using plain galvanized steel lines on my tranny lines,they only last a year or two here thanks to road salt eating them..
    I'm tempted to have custom hoses made to fit,but I've read that the steel lines themselves act as a cooler,and eliminating them might increase tranny fluid temparature..but leaky steel lines could let the tranny run dry!--dammed if you do,dammed if you dont!..:doah:
     
  8. ntsqd

    ntsqd 1/2 ton status

    Joined:
    Nov 28, 2002
    Posts:
    3,381
    Likes Received:
    0
    Location:
    So. CA
    Were you thinking of stainless tube vs. rubber?
    Stainless is a poor thermal conductor.

    While it's true that GM uses steel tube for a PS cooler on later models, I suspect that a small aux cooler would more than offset the difference btwn steel tubes & rubber hoses.
     
  9. broc944

    broc944 1/2 ton status

    Joined:
    Sep 23, 2005
    Posts:
    1,660
    Likes Received:
    0
    Location:
    Northern Minnesota
    The reason I want braided lines is for protection from vibration. Second time the rubber hoses have started leaking due to vibration.

    I hate the hose clamps, and I also do not really care for rubber hoses that attach the cooler to the existing lines and radiator.

    Vibration is what causes 90 percent of all the needed repairs I make on my truck. If a hose starts leaking, it is going to be replaced the -AN way from this point on.
     
  10. 70GMC

    70GMC Registered Member

    Joined:
    Nov 1, 2006
    Posts:
    40
    Likes Received:
    0
    Location:
    Reno, NV
    yeah you're going to need a 5/16 to -6 adapter like slapperbar said. i have my tranny cooler hooked up with an fittings and braided line. i used a b&m supercooler set up for an fittings, and i used a permacool thermostat
     

Share This Page