1979-1993 & 94 Conv [Subscribe to Daily Digest] |
I appreciate your wisened counsel on this issue Ray. In my previous theoretical solution, I did base the fix on the assumption that the fork has been bent in the way petey suggested, accepting his description of an over-muscled shift into first. Other than that as an explanation, I can't think of what would cause 2nd to pop out from that point forward. I do know that an aging gearbox can develop that symptom, and that reverse is often a pop-out problem gear. In the reverse situation, it's a matter of the reverse selector stub not pushing the idle gear far enough toward it's operational position. An easy fix is to flip the bracket which directs the stub. I've done that fix on my replacement 89 tranny and have seen the difference. In the case of the other gears where a seperate syncro ring gear is directed into place by the fork, the gear is either held firmly in place for optimum operation, or it's not. From what I know about these boxes, there's one central spring loaded aspect which keeps the syncro gears locked in place - the ball bearing detent positioning mechanism on the main shift selector rod (that which is seen exiting the tranny box to the rear). That detent feature has to be strong enough to overpower the syncro ring gear spring feature which syncronizes (through friction bearing surfaces) the output layshaft speed with the selected drive gear (without which you get grinding ala an old bus, truck or tractor), and once syncronized the two gears lock in place and are held there by friction and from the shift rod detent spring mechanism. As the tranny ages, those syncro gear edges become worn and rounded, thus reducing friction and causes the gears to pop out. Same could happen if the shift rod detent position spring becomes slack, although that is improbable given the stiffness of that spring. So given the overnight nature of petey's 2nd gear popping out, the only thing I can come up with is that the selector rod detent position while in 2nd isn't seating completely, which could be caused by a bent selector fork. Keep in mind that even though made of a hardened brass alloy, 1st/2nd gear selector fork is the largest fork in the tranny, and since the outermost finger part of the fork is what bears the pressure, it is conceivable for that length of metal to bend given enough pressure. The reverse bending part of my suggested fix is entirely theoretical. Would I try it? If the problem was agonizingly severe and I accepted that I might have to remove/replace the box regardless if the fix didn't work, then yes.
posted by 207.200.116...
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