what's the black goop on the underside?

e9999

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looked at a couple of 100s ('99s to be exact).
While checking the underside I noticed that both had a fairly thick (1/32-1/16"?) layer of black goop covering some of the mechanical stuff, and underpanels, etc. Not evenly though. Hard to tell if it was a rust preventive layer or some grease or oil baked on there. When I was rubbing it it sorta left a trace but could have been just grime.
Was there any standard protective coating on these? Or is it more likely to be sprayed on excess grease or oil?
Easy way to tell?
thanks
Eric
 
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Hey
Is that East Coast rigs?....I have that on my 80, it's a 97 bought out of the east coast. Haven't seen it much on the 80's Ive been under here in cali, but yes it's an undercoating, from the factory I've been told. It is not distributed evenly, on some of the skids, transfer, difs, kinda sprayed down the middle....don't sweat it. It's really thick, like you can scrape it off with your fingernail, but not wipe off with a rag or similar.
 
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I think it's the "factory" undercoating (at least that's what my local dealer told me).

My 1995 - 80 model has the same black tar.

It makes it hard to tell the difference between an oil leak and the black tar.

R
 

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