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Thank you, Barrman! I have cleaned up your donor/test Top Section, and will finish it up in the morning, install it, and give her a drive at first light tomorrow. Will report back.

Thank you, sir! Please let me know if you find one!!

Last night, we checked in detail the operation of the top unit while in a vise. It worked as-expected, without binding or hanging-up anywhere. We then moved all parts associated witht the Main Shaft. While it was occasionally tough to move it into 3rd gear, it also worked as expected in all...

Thank you Welder1. We will check the Main Shaft as you suggest today or tonight. I have a Master Mechanic buddy coming to visit. We will look for any extra play or misalignment, and perform the checks you outline, and report back. Thank you.

Here is the photo of the steel-wooled/buffed spot and the underlying synchro color....

I drove her in 1, 2, 3 and 4th gears today, but only could shift when stopped. And today, it went back to sometimes not allowing me this time to get OUT of 2nd gear, even when stopped and the clutch pushed to the floor. All other gears were accessible except 2nd gear -- it was the bad actor...

I drove her in 1, 2, 3 and 4th gears today, but only could shift when stopped. And today, it went back to sometimes not allowing me this time to get OUT of 2nd gear, even when stopped and the clutch pushed to the floor. All other gears were accessible except 2nd gear -- it was the bad actor...

....and I have not pulled anything heavy, but this is a 1966 M35, and was a pasture survivor, and used as a mudder there before I saved her, so it is quite possible she pulled loads within the last few years, I just don’t know. But maybe the synchros can tell us their story.......

Thanks for the suggestions. I will drive her again in the morning and make doubly sure the clutch is all the way depressed. I wasn’t consciously thinking about it, so who knows? I will also pull that inspection plate. Getting to know the truck is a good thing. Thank you again.

Thanks again. I will do as you suggest, tomorrow, and post some photos. My recollection is that my synchros DO HAVE some reddish tint compared to your photo. But let me take another look. I will inspect them closely and send photos of any markings.

So....I drained the 80-90 weight that was in the transmission and put it through a coffee filter and fine screen. Then swept it with a super magnet, and pulled sludge from the bottom of the case through the drain hole with my finger. Looked at all residue in the sun, on a white background...

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...