Auto to manual conversion

To be fair,
on the street only, with street tires;
my 3.55s (8.75) were new in the 70s. I would guess they have more than 300,000, miles on them, having been transferred from one Mopar to another, as the bodies fell apart.
They have suffered from 318s to 340s to 360s and currently are at home behind my 367HO. They have been mostly in A-bodies but for a year in a truck, and another few in a 360 C-body. Sometimes with an automatic but mostly with a 4-gear.
But they get fresh oil every now and then.
To be fair.