I rebuilt 3 different SR transmissions. They make some with reverse synchro and some without.
The input shaft, throwout bearing, fork, all need a healthy coating of molybdenum disulfide grease. The FSM specifically says this so check it out.
Yes debris accumulated on the splines directly contributes to the clutch disengagement and this could well be the major issue. Honestly there isn't much that I've seen that can actually go wrong with these transmissions beyond an obviously broken shaft or gear. Seems like they last forever if you just clean them up and use the right grease.
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