Hi AFrear.
The 3aj was the best xt6 ever built, but it still suffers badly from the 5th gear problem which usually starts to appear at about 15000 miles. In its early stages the problem is very dificult to detect. Eventually you start to hear a harsher droning noise only in 5th. With higher mileage the problem also affects 4th and 3rd. Using replacement 3aj gears is therefore only a temporary fix really as it just starts all over again . I can supply an improved kit for all elec start xt6s 1VJ,3AJ,3TB.
I have not seen this problem on 4PT 600Es yet.
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