4BT radiator hoses
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Thread: 4BT radiator hoses

  1. #1
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    Default 4BT radiator hoses

    Does anyone know the radiator hose numbers for a 4BT going into a 1986 GMC 3500 truck? I have off the shelf hoses but can not read the numbers.
    Last edited by wolf2006; 06-06-2008 at 08:41 AM.

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    I made the top from a few misc. peices and some pipe. The bottom is the same....I doubt you will find an off the shelf hose.

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    I just made the rad hoses for my Jeep yesterday, go to your local parts store and ask if you can go back and look at the hoses, measure connection sizes first, and approx measurements you will need.

    The top hose is Autozone number 61252 (I think it is also a Goodyear number too). Fit after trimming a couple inches off the rad end. Engine side is 1.75" ID, rad 1.5" ID.


    Lower hose is comprised of two hoses number 61323 is on the engine side (2.25" ID), reduced to 2"). The rad side hose is number 61252 (1.75" ID on each end).

    The local plumbing shop hooked up up with a street elbow and reducer which I soldered together, BTW, copper is not cheap $21 for the two pieces.


    ME AND MY DIESEL YJ ON COVER OF JP MAG MAY 2008!!!!!!!!!!!!!!!!!!1

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    Did you swage the ends of those fittings to provide a lip? If you didn't, the hoses will pop off the copper.

    I did that a long time ago to get around an alternator and the hose popped off after 10 miles. And yes it was tight.

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    If you use a upper stat neck from a 5.9 you can use a stock 5.9 hose and fit's the Gm neck.

    Scott

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    Quote Originally Posted by Goat View Post
    Did you swage the ends of those fittings to provide a lip? If you didn't, the hoses will pop off the copper.

    I did that a long time ago to get around an alternator and the hose popped off after 10 miles. And yes it was tight.
    Nope.

    Upper right pic, it held for 3 years.

    ME AND MY DIESEL YJ ON COVER OF JP MAG MAY 2008!!!!!!!!!!!!!!!!!!1

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    Wolf,
    If your setup is the same as mine, 1977 C/10 then the hoses should be:
    Gates Hoses #'s Upper Hose #21729 and Lower # 21731
    Hope this helps.
    Chuck

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