Does anybody know the radiator plug size "npt"threading I need to plug my radiator trans line inlets .
Because I'm installing a trans cooler that did not come with plugs
Unfortunately I'm not sure and neither is the clueless auto parts.
Motor is 5.0 efi 91 Thunderbird
If you remove the (2) fittings that the transmission cooler lines thread into on the radiator..
Then you would need (2) 1/4-18 NPT size plugs to seal the transmission cooling section of the radiator, no longer in use..
If you leave the (2) fittings that the transmission cooler lines thread into on the radiator in place..
Then you would need (2) 5/16" plugs to seal the transmission cooling section of the radiator, no longer in use..
There is no need to plug those holes, no coolant can leak out of them.
-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90SC 5-speed, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, soon to be transplanted into...
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-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-70 Torino GT Fastback project car. Needs EFI and a manual trans, but I'm not sure what motor to go with yet.
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