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Also make sure the shifter is actually putting the trans fully in gear
that would be my 1st guess if it shifted fine when it was parked ........ i had one that sat outside like that and the stem of the shift rod sticking out of the tranny had surface rust and didnt want to move enough to fully egage the gear........but it had water inside the the case when i went to cahange the gear oil ...........little bit of sanding and some silikroil on the shaft and some fresk gear oil works fine now........ has a slight bearing roar but gonna run it till it breaks