One thing that helps me when doing searches is to use a plus sign (+) in front of each word. I beleive that will display results that have all the words you want to find.
So for 1954 3600 firewall, search +1954 +3600 +firewall.
Also, change the search date to 1 year, or 5 years, etc....
I have a 1950 3600 and often have a specific 3/4 ton truck question.
Enjoy!