Truck transmission problem cheap fix

         My mechanic stopped by to tell me he found why my truck's transmission was acting up  occasionally. It turns out it was  check valve in the line from the radiator to transmission was clogging with gunk. The magnet in the pan and the filter was fairly clean no metal shavings found. That was my big concern it would have meant I would sell the damn thing. Now I am having a trans cooler installed he feels this will solve my towing problems.  I want my wife and her sister to be able to camp after I am gone and a dependable tow vehicle is a Must.
                  

       My mechanic David has a trans cooler out of a junker for 10$ The filter and gasket was 26$ but I need 6-8 quarts of ATF 4 . I offered him 80$ for to help cover parts but he said it would be Monday before mine got finished he had to fix his first but if I could do 130$ that would cover parts and labor. I think he needed the money to fix their truck his wife has always been hard on vehicles. I am happy our quickie oil place gets 89$ for a trans filter and fluid change and I think only the manager could spell CAR.