Gord:

Is the lockup occurring while you back with clutch engaged,
YES!!!

after you press the clutch,
YES!!!!

or after you begin to apply the brakes?
DO NOT GET TIME TO GO NEAR THE BRAKES.


My suspition is that a detent ball is missing on the shift rods in the trans.,
letting the 1st gear rod wander and jam two gear for a second but then, why
would it not stay jamed when the car stops?
Need as glass-top trans so we can see in when its doing it. Even our own tranny
expert in Cal. has not herard of this one.


Well, Gord, you do seem to have eliminated the brakes as the culprit.

The trans gears are helical, not spur, gears.

http://www.gearlab.org/GearPics/illinois01.html
http://www.gearlab.org/GearPics/illinois03.html

This means that the teeth mesh at an angle from the axis of the gear rotation.
(Helical gears runs smoother and quieter than spur gears.) The result is a force
parallel to the gear rotation axis which tries to push the gear sideways along
the shaft. Two helical gears in mesh will be pushed sideways in opposite
directions. Whenever you use a helical gear, you have to constrain it's motion
along the shaft, typically by thrust bearings or taper roller bearings.

If you have left out a spacer or a detent, then the gear (or gear and shaft)
will slide axially under load. Remove the load, and there is no sideways force.
Reverse the load, and they slide the other way. Maybe something is sliding where
it shouldn't go.

Remember that the differential pinion is a spiral bevel gear (not really a
hypoid gear), and it also sees axial thrust (the most axial thrust of any Amphi
gear).

http://www.gearlab.org/GearPics/illinois15.html
http://www.gearlab.org/GearPics/illinois16.html

Finally, something weird might be going on in the differential carrier.


Ed
67 Rust Guppy
El Cajon




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