Its actually not good to use teflon tape on certain areas. This might be one of them. If the tape were to get into the fitting it would be carried into the transmission. I recommend PTFE thread sealant. If it gets into the line it will just blend in with the oil and not cause issues.
Thread w/ Q's & INFO on towing... (Different from others!)
- Thread starter pjbrownva
- Start date
Its actually not good to use teflon tape on certain areas. This might be one of them. If the tape were to get into the fitting it would be carried into the transmission. I recommend PTFE thread sealant. If it gets into the line it will just blend in with the oil and not cause issues.
AuSeeker
Elite Member
Phil,
Just an FYI, the Tees and male inserts you have posted are for 3/8" ID hose, you will not have 3/8" ID on those fittings,
more like 1/4" to 5/16 max, the OD of those barbs are 3/8" so the ID will definitely be smaller and IMHO closer to 1/4" than 5/16".
That all being said if the hose on your trans coolers and where they connect to the transmission are all 3/8" ID hose and or 3/8" OD tubing,
the inlets and outlets tubing/fittings on the coolers and transmission would not have 3/8" ID either,
so I would think that the minimum 1/4" ID will be fine and not restrict the flow of fluid.
Just an FYI, the Tees and male inserts you have posted are for 3/8" ID hose, you will not have 3/8" ID on those fittings,
more like 1/4" to 5/16 max, the OD of those barbs are 3/8" so the ID will definitely be smaller and IMHO closer to 1/4" than 5/16".
That all being said if the hose on your trans coolers and where they connect to the transmission are all 3/8" ID hose and or 3/8" OD tubing,
the inlets and outlets tubing/fittings on the coolers and transmission would not have 3/8" ID either,
so I would think that the minimum 1/4" ID will be fine and not restrict the flow of fluid.
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pjbrownva
New member
Thank you, AuSeeker.
Everything you said makes sense, and is very helpful. And yes, the tubing on the hard lines is approx 3/8" OD (9mm or 10 mm metric). So it looks like I CAN use my bypass valve after all... I probably just need to use bronze connectors for everything, and verify their operating temp range, since some the brass is only rated for up to 200 F... which I *know* i will exceed while towing.
Also, thank you @ Brian3676 , I will use the PTFE thread sealant that you recommended. I looks like all I need to find is one high-temp Tee, and three high temp male 3/8" NTP to 3/8" hose barb fittings that are compatible with brass and I'll be good to go! I'm getting excited.
Next task... look up melting points for brass and bronze. Depending on what I find, that might answer my question about which metal to use... although I have learned that there are many different types of brass and of bronze... still, if I see a trend, that it may be all I need to know.
BlackWorksInc
New member
Out of curiosity with so much effort being placed on transmission fluid cooling. Are you guys following the Towing guidelines for fluid intervals?
pjbrownva
New member
Honestly, I don't know what they are...
but I renewed all fluids when I got my 4R, and I've put fewer than 10K miles since then. I'd certainly be happy to follow the recommendations.
When I changed my front and rear diff and transfer case fluids, I used Mobil Delvac, because it seemed to have higher heat tolerance and more shear resistance than the regular "Mobil 1" gear lube.
BlackWorksInc
New member
If I remember correctly, it's 60k when towing, after that every 30k. At least according to the "Maintenance Schedule Guide" that comes with the vehicle when you buy it.
