On my Pontiac nothing, but it’s a means to an end…..
I rebuilt the engine on my ‘62 Mercury over the winter. I had about 75 miles on the break in and lost 2nd gear on the transmission. Well, that was 6 weeks ago. I finally got out in the shop and pulled the tail shaft to get the governor out. Cleaned it up and reinstalled the tail shaft, then dropped the pan , cleaned the brass screen/filter, then filled it up. I still had it up on jack stands and it shifted in 2nd gear.

I’ll try to actually road test tomorrow.
OK, now I can swap spots in the garage and pull the engine out of the LeMans. Massive oil leaks, detonation , and who knows what I’ll find when I tear it down. Hoping for an overhaul and cam swap, but may rebuild depending on what I find.
I just wanted to get the Mercury running before I tore into my next project.
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‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
‘55 Catalina
‘62 Mercury Meteor-all original, bought new by my grandfather
71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride