[DAVID GAGNARD]

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I have a tremec in my 65 Mustang and had the same problem in 3rd & 5th....My shifter was actually right up against the front edge of the trans tunnel just barely touching it and when I let off the gas it was enough to "push" it right out of gear.....made an adapter to move the shifter back about the diameter of the shifter,no problems since.....

Check when you have it in 2cd or reverse for clearance between the shifter and the hole in your trans tunnel,bet you find the problem.....

David