Join Date: May 2006
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You have received some great information from Northeaster, but before tearing the transmission apart check the adjustment of the actual shift mechanism on the transmission and the detents that actually hold the mechanism is gear. I had a similar problem on my Kanzaki KM3A fitted to a 3GM30F. Turned out to be adjustment and a weak detent spring.
The transmission manual should have details of the adjustment specs along with a diagram.