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My 99 2wd Tahoe LT was born with those lines. It had all the heavy duty cooling options. Engine oil cooler, trans cooler, electric pusher fan, 34x17 dual core radiator and the 11 bladed clutch fan.RockAuto says a 97 2500 with cooler also uses line with rubber. But if OP doesn’t have a cooler then his lines wouldn’t have rubber section.
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Yup, if it’s got OE transmission cooler, it’s got flex tranny linesMy 99 2wd Tahoe LT was born with those lines. It had all the heavy duty cooling options. Engine oil cooler, trans cooler, electric pusher fan, 34x17 dual core radiator and the 11 bladed clutch fan.