3th gear falls out

wkuehnis

wkuehnis

Member
Hi,
when I drive down a very steeply street in 3th gear for more then about 10 seconds, then the 3th gear falls out into neutral.
I can hold the shift lever, then it's not a problem.

What exactly is the problem in the transmission ?

Thanks
Willi
 
If the 2-3 gear is too loose on the shaft it slides on, then it can walk out of engagement.
If the flywheel cover isn't dialed in to be within .006" or less, then the input shaft won't be in a straight line with the crankshaft, and that can make it walk out of engagement.
 
Tom is talking about the shims that go at the top of the flywheel housing. 2 bolts that are on top, also hold the throttle assembly. Check a parts catalogue. Search "jumping out of gear" or " align transmission".
 
Wish I could post pictures! I'd post one of my old input shaft with the wear on the area where the sliding gear engages it for third gear. Compare it to a good one and you can see right away where it's worn. Boy, I had a nice transmission after I made all the improvements!. Start with the trans cover and check the detents. Better replace the springs and detents themselves (cheap). Next the shift lever. Mike the ball, should be.500. If it's almost square weld it up and forge it to a ball. (Forging toughens it) then finish it up by carefully grinding it back to a ball. Then check the fit in the shifting gates. If it's too tight, use emery cloth and roll it around till it fits loosely in the shift gates. Not too loosely or you 'll defeat the purpose of all that work. The ball should mike around .495-.500. A little over or under doesn't make too much difference, as long as it doesn't bind. It will shift like it did when it was new.
Terry
 
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