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Originally Posted by jerrydirks
Does anyone know the purpose of the urethane that is applied to the trans and diff connections to the c channel???
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The "goo" is applied to reduce the potential for "crevice corrosion" that can develop in the joint area where the aluminum C beam bolts to the aluminum transmission and differential housings. Because if it's galvanic nature aluminum is especially subject to this kind of corrosion. Its purpose is to keep moisture and road salt out and provide some level of dielectric isolation between the aluminum components and steel bolts. Otherwise this contact area could experience severe corrosion and pitting after a few years especially if the car is driven much in the rain or snow where road salt is used. However, most of us don't drive our Zs that much or if at all in such conditions so not using goo is not a big risk. I work in the marine industry and see this kind of corrosion problem quite frequently in ocean going ships and structures in sea water.