New 4 Speed
My brother once owned a 1967 GTO. When he purchased it, it was equipped with a three speed manual transmission. He wanted to upgrade to a four speed, and he found one at a local auto supply store / speed shop. They had a Muncie M20 for sale, but it had previously been damaged and the case had been welded up. The parts guy assured him that it was ok. He purchased the trans and a new clutch and Hurst shifter and spent the weekend installing it. For his first test drive, he had my other brother follow him in his car in case anything went wrong. Around town everything seemed fine. He decided to get on the expressway to test it at higher speeds. He wound out the gears in first and second, then shifted into third. As soon as he dumped the clutch in third gear, the trans exploded! He watched in disbelief as his brand new Hurst shifter disappeared through the floor. He tried to grab it but was too late. My other brother, still following, saw a pile of shrapnel, a drive shaft, and a cloud of gear lube shoot out from under the car, most of which he was able to avoid.
The parts store had sold the trans “as is” and did not stand behind it. Chalk it up to experience.
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