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Thank you, gringeltaube, Mike 715 and Mullaney! I plan to drain the 80-90 weight today, inspect the fluid and the top plate, as you have suggested, and see what we find. The internals of the gearbox actually look very pristine, as a friend said -- "almost as clean as an automatic...

A friend asked what weight transmission oil I am using and it is 80-90 weight. I looked up the spec in TM 9-2520-246-34-1 and it specifies Lubricating oil, ICE, OE/HDO 10, MIL-L-2104, which in its variants runs from 10W to 30W. Could it be that the heavier oil I am using is causing this...

Just removed the top section of the transmission (for the first time ever.....!) Attached are some photos. Only thing my novice eye spotted are some apparently heat-affected areas -- rainbow-ish hues. I am a bit fearful of removing too many more pieces and the safety wires etc. That is...

Will do. We won’t be back there for ten days but will start a new thread at that time. Newbie is the code word....👍

Thank you, Gringletaub. Sadly, the test drive went flawlessly, but later yesterday afternoon, I took my wife for a ride, and after one shift, the same no-shift condition occurred. This time, double-clutching helped to shift one more time from 2nd to 3rd, but then it wouldn’t shift again...

Thankfully, Jason -- Beltfed -- also gave me that great advice to check those jackshaft bolts, which I did a few weeks ago. All were tight and to spec. I checked them from above, but did not have to change any out. I will buy new bolts for the issue that started this thread, and try to...

Yes — I would like to replace that bolt, but if I pull it out, the spring will probably fall off and I will need to pull the top section. But yes — where can I find the bolt spec? Thanks, Frank!

FIXED IT! Pulled the center floorboard, and tried to re-torque the troublesome, rearward 5/16' bolt, and found that the nut threads were stripped, and the bolt was maybe at 20 ft-lbs and holding, but far looser than spec. There was enough good thread to double-nut it, and then torqued it up...

Just read TM 9-2520-246-34-1 pages 54 to 105 and it looks like those two "screws" do not attach directly to the forks, or have other features attached to them. They have one spring on each of them, and have a 45-50 ft-lb torque requirement, which I will go and check. Not obvious what the issue...

Have a 1966 M35A2 (which we bobbed and are restoring). While installing a custom back-up beeper micro-switch on top of the gearbox, I unknowingly removed the nut, moved iit a bit left and right, and rotated (but did not remove) the 6 1/2" long (5 - 3/4" usable length) x 5/16" fine thread shaft...