Hello Paul, you're right about the description of the system...I have located the adjuster (Pinion kit) GM 3705288. I am considering MIG or TIG as soon as I remove the backing plate...Unfortunately there are no real auto parts stores near me, so that is that is why finding original factory numbers is so important to locate the parts that I need... I have a few photos of the stuff as requested...
Curiously enough, the wheel cylinder caps are marked FC 4665 "Ind. Arg." (Industria Argentina/Made in Argentina) and the body is marked FD 3677 C3...It is the second component on the truck marked that way... The front grill is marked Gavila, M. R. Industria Argentina... Sorry to get off topic, but thought it was odd and interesting.
