Gents, I just picked up a 1975 135HP Johnson. Runs fine on the trailer, but has issues shifting into reverse and forward. I replaced the lower end oil but no change. I adjusted the linkage, which helps, but it still pops out of gear under load. It seems as if it won't quite engage fully. To get it to stay in gear, I have to over adjust the shift cable, and thus lose the opposite gear (adjusting it to stay in forward more causes the throw to be to short for reverse) Could it be a stretched control cable? Shift dog? Any ideas?