833 making odd noise in 2nd gear only

Ima thinking; that's a poser for sure. I can tell you what I think, but it it's gonna be a
guess.
it's not in the bellhouse
it's not in the box
It's not at engine speed.
It's not shaking anything
It's pretty much at 1800rpm= 22 mph
To me it seems to be at wheel speed.
22 mph is ~1700 with 3.23s and 1860 with 3.55s so Ima guessing you have one of those. Lets say 3.55s EDIT, I see you have 3.23s.
lessee,
22mph is 32 feet per second, and 27"tires are 7.0686 ft, so
32/ 7.1=4.5 revolutions per second; nope too slow; but not by much.... let's try something else
I didn't put a stopwatch to it, but it keeps time with my resting heartbeat so Ima guessing 60 tap-taps per minute, At 1800 engine rpm this is a reduction ratio of 1800/60= 30 to one . Well that's a bust.

At 1800 engine rpm, in second gear (1.92) the driveshaft is doing 938 rpm so that's a bust, but thru 3.23s, I get 290 axle rpm, getting closer. but that's where it stalls.
I don't know what it is but I know I can get that box down in less than 17 minutes, on a 4 post hoist, including dropping the GVod behind it and the TTI 3" exhaust so, if it was mine, it wouldda been on the bench in less than 1/3 of the time than I spent on this post, lol..
I know I said it's not in the box, but where else can it be?
Check your lugnuts before you start jacking up the car, I mean just cuz.

BTW
I've pulled that stunt literally thousands of times with 3.55s with no powertrain damage whatsover; except when I do it, the tach is gonna see 7000/7200 with a GVod splitshift right behind it that is gonna try to knock the rpm down to 78%=5600 in the blink of an eye and the tires are gonna complain about it first. The point is this, Ima still doubting that it is anything serious.................. I could be wrong lol.