There is a sleeve that the shift fork engages to move the gears forward and backward so that could be the problem. The rear cover of the trans can be removed fairly easily to look at the gear stack and most of the moving parts. If the box is opened most likely it will show worn synchros and dog teeth as well with 150K miles. It will be cheaper to find a good used box as the disassembly and assembly of these transaxles is quite expensive. Parts are pricey as well.
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