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M46 transmission 3rd gear issues

Slip out? Pop out on deceleration?
Shifter bushings sloppy? Trans mount junk?
Bushing between third gear and mainshaft worn out?

It all happens. Go fish!
Is the shift boot on backwards or not installed correctly? There could be enough pressure from the boot to push the shift lever out of gear.

Try removing the boot and see if the problem goes away.