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Puzzling! Tranny?


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I'm not sure if this has anything to do with anything, but last week I drained my tranny and put new gear oil in. It's been fine. Today I crank my truck that has only sat 2 days, put it in reverse, back up, then when I go to put it in first, it win't move into any gear. I push my clutch in and out and killed it and restarted it. It did fine getting in gear and shifting on my way to work (town driving). I pull into the parking lot and go to park, move from second and try into first. Will not move into any gear. I pump my clutch and finally it slides into gear after me sitting in the way of other vehicles a few minutes. This puzzles me. I do maintenance and parts fail? I' ve been thinking slave. Seems to be a clurch problem, but I don't like my tranny anyway as its notchy and sometimes catches going into second. Has anyone had this problem? It's a renix 4.0/ BA10/ NP231. Is there anything I can check? My tranny doesn't seem to be leaking. On the way home it was fine? This intermittent problem seems odd. Thanks for replies in advance!

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My AX15 did this when I switched to redline. It got the point where I could no longer shift while driving, (would have to pull over after exiting the highway because I could not downshift) however it would shift when the car was off. Eventually it got to the point where the car would move when the clutch was completely pressed.

 

Finally I drained the expensive mtx and replaced it with the cheapest gear oil I could find. It started getting smoother over the next week and now it's been months. It's my opinion that the synchros may disagree with certain fluids and hang.

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