Fill out your sig so we know what year and mods. All stock? Hurst shifter? Does the whining change with each gear change or does it only seem to change with vehicle speed regardless of gear?
Hurst shifters are known to transfer a lot of sound to the cabin, the stock shifter and soundproofing was good at masking that noise.
But, without more details about your car...
- 2011 Challenger R/T Classic GWE 6-speed, 27M, Hurst Billet Pro shifter, SX catch can, SX skip-shift eliminator, JBA Cat4Ward headers, 180 t-stat, DiabloSport-tuned, Charger intake tube, Blastin' Bobs reso delete, BC coilovers, Razor's Edge front and rear 4-point braces, SPC UCAs, SPC rear camber bushings, Michelin Pilot Super Sport 255/45ZR20