Rolling wheels causes crackling sound in some gears in Sian

[recovering_from_dark_ages]

Does anyone else’s Lego 42115 Lamborghini Sian NOT have this problem? In some of my Sian’s gears, but not all of them, rolling the wheels causes a crackling sound.

When I first built it, I noticed that a gear was missing so half of the gears were effectively a neutral gear (no effect on the engine). So I took the car apart in pieces to install the missing gear, and ever since then, the gearbox makes a crackling sound when I roll the wheels in some gears. I’m trying to determine if I caused this or if it’s expected.

Edited 8 hours ago by recovering_from_dark_ages