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Installing Tranny Cooler... Help?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by SAVAGE1, May 24, 2001.

  1. SAVAGE1

    SAVAGE1 1/2 ton status

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    I've had a Hayden Tranny cooler in my garage just sitting in the box. Since the weather has been warming up and I see the temp guage getting hotter, I've decided its time to install it. I opened the box and I seem to be missing some of the mounting hardware. I just have the cooler and the hose, no instructions. My question is: Where did you guys cut into the existing cooler lines. Both my lines go into the right side of my radiator. Did your cooler kits come with fittings to be able to splice into the stock line? I can order the fittings from Jegs. By the way, what size tubing is the tranny line? Its either 6,8,10, or 12. Any info would help.

    Thanks,
    Rod

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  2. Wheels

    Wheels 1/2 ton status

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    Mine came with all the necessary hardware, wasn't a Hayden. Had barbed ends that hooked up to the tranny line and into the radiator. Mine were 5/16" lines and it came with 5/16" hose (uses a different type hose for auto trannys, don't use fuel line). Tap into the return line (for a 350 or 700R4, the top line coming out of the tranny is the return line). Have the pressure line (bottom from the tranny) go into the radiator first, then the extra cooler, then back to the tranny via the return line (top line).
     
  3. Pookster

    Pookster 1/2 ton status

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    Thats interesting, cause mine came with both an oil and tranny cooler. If your just adding an additional one, hook it up in series. You shouldnt need to cut anything unless you need mounting space area. In that case, you would follow the output end of the tranny to the original cooler, get a piece of tubing (3/8th or 5/8th worked for me) from the autoparts store, connect it to the old output line of the cooler, and plug it into the input line of your new cooler, and then get another piece of hose, and connect it to the output line of the new cooler. Then take that line, and attach it to the metal return line to the transmission. This will effectively give you the cooling of both coolers.
     
  4. Boss

    Boss 1/2 ton status Author

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    Man, if I recally correctly, the TH350 return line is on the bottom and the R4 is on top.

    Anyhow, this is a simple job if you have all the parts. You'll need the fittings that screws into the radiator where the return line use to be and then the fitting that adapts to the return line. These fittings has the barbed ends on them to put the hose over. Now, attatch the hose from the fitting you put on the radiator (where the return line use to connect to) and route that to the cooler. Then route the next hose from the cooler to the return line with the fitting you put on that. and you're done :)
    Boss

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  5. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    You can go to Pep Boys, Autozone, etc, and get a remount kit for you cooler. They are like zip ties but with a big flat head on them.

    Also you can get the fittings in a kit from hayden at these same parts stores. Or buy them from a hardware store. (Just brass fittings) One fitting screws into the rad. and one is female so the tranny line can screw into it. They are both barbed and the hose is held in place with a hose clamp. Me thinks its a 5/16" fitting, not real sure though.

    John

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  6. SAVAGE1

    SAVAGE1 1/2 ton status

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    Thanks guys, I'll go try to find the fittings. Did you guys mount your coolers in front of the radiator behind the grill?

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  7. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    I thought the return line was on the bottom for both tranny's. Anybody now for sure. I am putting a tranny cooler in next week????? Dan
     
  8. blazin72

    blazin72 1/2 ton status

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    Dan
    It should be the top line on a TH350. I just got done putting one on mine.
    The best way to tell is start it up let it run for a minute or so and the reach down and feel the lines the one that is cooler is the return line.
    Blazin72


    Blazin 72
     
  9. DMK

    DMK 1/2 ton status

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    It is on the bottom of the radiator.
     
  10. Boss

    Boss 1/2 ton status Author

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    hahah, One person says bottom, and the other says top...haahha. Confusing aint it?

    Anyhow, what tranny you got?? In my old K5, with a TH350, it was the bottom line (return line). On my new one with the 700R4...it is the top line (return line). I know this for a fact. But like the other guy said, good way to test is to let it run for a bit and the cooler line is the return.
    Boss

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  11. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    I have the Hayden "Stack Plate" (like the B&M) on both my trucks. Works great. Hayden recomends connecting before the radiator. I think their reasoning is to keep some temp in the tranny. A good operating temp is 150deg. In the winter you can run it too cold and again running through the radiator AFTER the cooler will stabalize the temp.
    Really you do want some heat. The reason for this is it turns any water vapor that has condisated inside the tranny back into vapor to send it out the vent. If you keep it too cool this can't happen. The point where things ar too hot is over 170. You get over 200 most information I have come accross say damage is happening over 200.
    On the TH350's the pressure line should be the bottom one. THere is a very good reason for this I might add. By filling from the bottom you push any air out of the cooler. Going the other direction you run the risk of trapping air. the trapped air can act like a dampner and drop line pressure. This being said I was careful to mount my cooler with the fittings pointing to the side and again filling from the bottom to purge the air.
    If you have the same kit I have it had a nice flange on both sides. On my 75 and 79 I screwed one side to the core support and on the other side I made a bracket from a radio strap to mount it off the center suport. THis made it possible to mount without having the weight hanging on the radiator. I just never felt good about attaching to radiators and A/C Condensors. I then found some big grommits and drilled some holes next to the radiator through the core suport over the expansion tank. My reason was again line pressure. I wanted to keep the rubber hose as short as possible to limit drops in pressure from the hose expanding.
    After all is said and done I am very happy with them. Both my trucks have the Hayden Temp gage in the pan. Taking the temp in the pan is what the temp is after it has been through the tranny and before it goes through the cooler and into the tranny. That means it is usualy hotter than most of the tranny is running. The Highest I have ever seen the temp was towing a car up a very long and steep grade. I hit 180. It was 85 deg outside. once I crested the hill it was back down to 170 in a mile and back 150 normal in about 2 miles. That was at 65 mph with about 4500lb of car and trailer and 3.08 gears with 32's. It was working REAL hard. On the trail I run about 150.
    That kit is a good investment.
    Now if you got the "Chevy Kit" it should have come with the hose, mounting zip ties, instructions, a barb adaptor for the radiator and 4 hose clamps.
    You simply dissconnect the hard line from the tranny where it connects to the radiator. I think that's a 5/8s. It is a flare fitting and I highly recomend you find a flare nut wrech to keep from chewing it up. Slide the nut back and put the hose over the hard pipe. The Flare acts like a barb and it will seal just fine. I would recomend doing something to keep the nut from rattling. If it rattles on the hard line long enough it could wear a hole through the line.

    Diging it in the dirt with my K5's
    Grim-Reaper
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  12. ftn96

    ftn96 1/2 ton status

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    Here's the might Grim to save the day!!!! I was going to recommend him to you Grimmy. I be remembered that you had the Haydens.
    Rock on!!!

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