My daughter was driving her 85 Cabriolet last week and she lost 4th gear. She told me there was no loud kind of sound. She was shifting from 3rd to 4th and missed 4th and hit 2nd. She then shifted back to 3rd and proceded to 4th and there was no 4th.
The next day I re-bushed the linkage and replaced the linkage rods. I was not too worried about the "no 4th" gear problem thinking that when I replaced all the shifter linkage bushings, it would go away.
I finished up the linkage bushings and adjusted the shifter and I have the same problem. The shifter does feel better than it did though....
I manually moved the selector through each gear and the tranny did engage in all gears but 4th. There is a different feel when you manually select 4th compared to the other gears. You can hear and feel the shifter move the gears on all but 4th. When it goes to move to 4th, it feels like it is just the selector moving, nothing else.
When the car is moving, you can't move the shifter into any of the other gears without the clutch but it will fall right into 4th no problem.
I found two 9a's, a FN and a FF tranny but I like the idea of rebuilt tranny better than a used tranny, any chance of getting a price quoate to rebuild or swap the 9A?