it's time to find my rear axle

do you also make changes in the automatic gearbox?
That depends on how long it's gonna stay in the car,lol.
If it's gonna stay; then you would want to change the speedO gear so it's accurate again. and
Depending on how big a gear change you swapped in, you might want to correct the governor for better-timed auto upshifts, which is not that big a deal to do.
As you go bigger in gear numbers, like from 3.23, to 3.55, the need for higher stall decreases somewhat..... Unless you like the whiplash of a 2800plus TC, with 3.91s lol. I mean it's kindov addictive.

I know what you mean about time. The older I get, the faster time seems to go. I'll be 68 shortly and the last 7years have absolutely flown by me.Crap I'm almost half way thru my last quarter.