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automatic transmisson with suspected pinhole leak at cooling lines 200 1990

My 245 is leaking transmission fluid where the cooling lines are near the auto matic trnsmission. When i stop the engine, the dripping goes on one at the average rate of one drop per ten seconds for about ten minutes and then it stops. It loks as if ATF fluid is is thrown sideways over the exhaust down pipeso isuppose the drippin or squirting is more intense when cruising on the highway. I strongly suspect a pinhole in the cooling line. I could get the replacement part from my parts car a 1986 with the same auto box but it is in a snow bank for at least the next two weeks

In the past I have fixed that kind of problem in the fuel return line with a spliced-in rubber hose and clamps. Can I do the same thing with the ATF line even if there is pressure and heat in that area from the exhaust system?

What is the outside diameter of the cooling line and what size wrenches do I need to disconnect it from the transmission?






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