The 4 speed transmission shift arm is sloppy on my 1955 Chevrolet first series 3100 pickup. This has caused me to grind the gears from third to fourth. I have a spare transmission that seems to be tighter. There are eight bolts holding the cover on. Can I just switch the arms and top plate without it turning into a major project. If I remove the pin that looks as though it is holding the arm, will the arm come out? Will that make it easier? The shop manual says be careful of springs,pins, levers, etc. On a previous thread someone made it sound fairly simple. I am a backyard putz. Am I missing something, or can someone give me some advice, or should I find a professional, which might be like finding a needle in a haystack!! Thank you.