i used to toy around with the idea of putting a vacuum reserve tank on my dad's 40 1/2 ton put just kept taking the wiper motors apart cleaning them out and compressing the felt diaphragm slightly taping the flange with a small ball peen hammer to compress the felt outwards to improve the seal and lubing it lightly with Vaseline ,and made sure the dual diaphragm fuel pump was working .i know it's a pain in the but when you are going up hill in a rain storm .p s rain ex is a great help when that happens then the water just blows off the windshield .i just talked to my ol man and the reserve canister did not work .but these guy's appear to have a interesting kit
http://www.newportwipers.com/ saw it in a issue of classic truck's feb 2006 volume 15 no 2
