[Healeys] Gearbox jumping out of 4th gear coasting downhill or decelerating

Bob Spidell bspidell at comcast.net
Sun Nov 5 20:21:47 MST 2017

I've finally removed my geabox and done some preliminary inspection.  Shifting forks are worn down some--not surprising in a 200K mile box--but all gears look to be in pristine condition.  One thing I noticed is that the first motion shaft seems to wobble a bit, unlike the output shaft with turns freely but doesn't wobble much if at all (both large bearings appear to be in perfect condition).  Should the rear of the first motion shaft fit snugly into the front of the output (main) shaft, or is a bit of play to be expected?   I've thought perhaps the increased compression in the new engine might cause some 'buckling' in the first/output shafts--more than the sliding hub can restrain--so could this be the cause of jumping out of 4th gear?

Also, DWR sells an uprated 3-4 sliding hub, which it claims eliminates the 'jumping out of gear problem,' so this issue is apparently not uncommon.


Bob Spidell - San Jose, CA
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