K Kevin Blank Member May 19, 2021 #1 Are the cooling line fittings on a T400 tranny ¼-18 NPS pipe threads?
Indycars Administrator Staff member May 19, 2021 #2 Looks like you are right. According to Summit it's 1/4-18NPS, but it needs a crush washer to seal since it's a straight thread. NPS = National Pipe Straight thread, since it's NOT tapered, the washer will be required. https://www.summitracing.com/parts/icb-an710-06a https://www.jalopyjournal.com/forum/threads/th350-transmision-cooler-line-1-4-nps-question.1147460/ .
Looks like you are right. According to Summit it's 1/4-18NPS, but it needs a crush washer to seal since it's a straight thread. NPS = National Pipe Straight thread, since it's NOT tapered, the washer will be required. https://www.summitracing.com/parts/icb-an710-06a https://www.jalopyjournal.com/forum/threads/th350-transmision-cooler-line-1-4-nps-question.1147460/ .