You can hear it when it's in OD. Makes no noise when it's 1:1. This in a 40 series bush truck, so no carpets or frilly stuff. Here's the driveline: SBC, Ranger, SM420, Toyota 3 speed t/case. So needless to say the entire driveline is noisy, including the t/case. Shifts smoother than the SM420, in fact having a split shift is excellent. I always have a gear and the split between 2nd and 3rd on the 420 is tall. Downshifting is great as well, it has syncros so I just clutch it it when needed. I originally used this box as my SBC to Toyota 4 speed adapter, no driveline modification required. That was in 1993.
1977 - FJ40-V8-Ranger OD-SM420-3 speed t-case, ARB's f&R, SOA, OB air, 4 wheel discs, FF rear end (Ducky)
1988 - FJ62-Belton springs, ARB rear c/w 4.56's, 5 speed, (Liliana) RIP
1989 - FJ62-Bone stock (Iris)
I shift with a pedal, not paddles