My brother had a 1950 1/2 ton with a 235 that used to pop out of 3rd gear under a load. He simply installed an eye bolt thru the floor under the shift lever with an old bicycle inner tube attached. When cruising, he slipped the free end of the inner tube over the shift knob and he had what he named a "Tennessee overdrive". Crude, but it worked. Now my tranny has acquired this terrible trait. My transmission has not had anything done to it since Saginaw. I thought I would try Royal Purple transmission oil, but it did not remedy this condition. In fact, all it did was make a rather pretty, but expensive puddle in my garage. Any ideas as to the cost for an overhaul?
