4th gear is the next set to rear of the constant mesh gear and transmission input shaft gear. You can see through the belt pulley gear box drive hole if the top and bottom gear are in mesh when in 4th. If you can see those gears are in mesh and the top transmission shaft doesn't turn the problem has to be with the counter shaft inside the constant mesh gear or just inside the 3rd and 4th drive gear.
Also unless you have a PTO failure and it stops turning when engaged, it would be a failure of the lower transmission shaft to transfer power to it if the constant mesh gear is turning or even if its turning the front of the lower shaft.
This post was edited by D Slater at 05:37:21 09/11/14.
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