The city has a fleet of GMC 3/4 ton and 1 ton trucks. Their big complaint is the ABS control module that is mounted on the frame with all the brake lines that enter on top are covered with extream oxidization. Another area to keep clean or rust free.
good luck
I sprayed the underside of my truck (including the ABS control) with AMSOIL Heavy Duty Metal Protector (http://www.amsoil.com/products/amh.html). I've used it with good results on my other vehicles. It creates a durable waxy coating that works well protecting against salt. smile.gif
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