I got an 8 3/4, 741 case, 3.23 open rear from a 68 GTS. I put plenty of grease in the bearings and set the preload after cleaning it out. It looks to have sat for a long time. The teeth on the gears looked really good but that's the only inspection I could do.
When I I'm driving it above 40 I can hear it howl a bit. The only time it didn't is when im keeping my speed steady. It makes noise on acceleration and when I let off the gas.
Does this sound like the axel bearings, pinion bearing, gears...? I have new green bearings but I haven't installed them yet. How could I test to figure it out and if it's the gears could I just live with it? I have no idea how long it's been like this or if it's cause it sat a while. I even changed the fluid from 80-90 to 85-140 and it stayed the same.
