Transmission line fittings
I have a '72 C20 with a TH350 transmission. I bought it in pieces, so I never saw the transmission cooler lines connected. Both ends of both lines have flared ends and fittings. One of the flare fittings on the transmission end is screwed into a separate brass adapter with the same size threads and a flat end. Of the four ends, it's the only one and there are none in the bolt bags I received with the truck. Is the adapter supposed to be there? Should both lines have one? Should both lines have two? What is the adapter called and where do I get more? I tried threading them all in as-is, but the non-adapter line leaks from the transmission end. All appeared to tighten just fine.
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Re: Transmission line fittings
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Re: Transmission line fittings
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Each port on the transmission should have a brass adapter 1/4 NPSM X whatever inverted flare. Just go to your local dealer and buy one or two if you are missing them. Part number 8637742, I just bought two myself last week. Cost about $7 each from GM.
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Re: Transmission line fittings
I too just had my transmission rebuilt but these were not on the tirbo 400 so I found some. Are they supposed to have a brass washer between them and the transmission aluminum body or will they seal up when without the washers?
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Re: Transmission line fittings
Man, none of the local parts houses had them. Napa said it was a special order item that would cost ten bucks plus UPS freight. O'Reilly's said they couldn't get it even though I read them the part number off their own website. I finally contacted the local hydraulics supply store and the carried them.
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Re: Transmission line fittings
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Re: Transmission line fittings
You can buy these at any GM dealership parts department. If they’re not in stock they can get them next day. If you don’t have a GM dealer close I think Jegs and summit sell them too.
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