how do i know if i need transmission r cv axle on 1996 Oldsmobile Bravada

it makes whining noise when i put it n reverse and when i go certain sped in drive

Asked by for the 1996 Oldsmobile Bravada
An axle doesn't make a whining noise a transmission may. Check the transmission oil level and could it be a low power steering fluid level, that would make a whining noise as well.