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727 Cooling lines


Active Member
Local time
6:35 AM
Jun 24, 2022
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Merryville, La.
I am replacing my steel cooling lines on my 727 torqueflite Tranny. I am replacing the brass bushings on both Tranny and the Radiator Also. Should I Teflon these bushings or not. It is very hard to get complete seal on these lines.
The side of the adapter that is 1/8" NPT would get teflon tape (or other sealant).. The other side if that adapter is a straight thread and sealer or tape could only serve to hinder the proper seal.
"Bushings" do you mean adapters, 1/8 npt to flared line fittings? PST592 thread sealant into the case and radiator. Flare fittings on the line seal themselves.
Teflon is a PITA the second time you assemble it - the bits left in the female side can get into the system. I'd use a good pipe joint compound for the 1/8 npt side, keep it one thread back from the end.
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