Good idea about asking the question is General Truck Forum. But Welcome and hope you get them fixed. Love to hear you keep it original.
Mine work just fine but you have to work with them. Going down the road on a rainy day you might as well drive a little slower so you will notice when you take your foot off the gas the wipers will work real good, but go up a hill or accelerate and you got to go blind. LOL Make sure you use Raindex on the windows and you can go a while before you even have to put them on. Ya It sure is fun listening to the wipers and the engine noice on a rainy day. Can't hear much more.