Does the shift lever appear to move normally to reverse position or doesn't seem to move all the way so trans never goes into reverse? Is all that normal but just no movement?
There have been reports of external linkage problems where loose, sticking or worn parts doesn't allow full travel of levers at transmission so gears won't mesh or will try to select two gears at once.
If lever movement seems normal, if it has the original R9 overdrive, interaction with trans could be preventing reverse movement. There is some internal linkage that might be sticking & preventing the trans lever from moving the reverse gear or there may be a mechanical or electrical problem in the OD which locks up the OD gears. Details of the interaction and operation of the overdrive and explanation of the OD reverse lockout problem are in Service Counselor Vol 21 #15.
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