A833 slight whine on decel

Bought a used a833 that was very clean from a reputable parts seller in the industry. Popped the side cover and it looked nice and clean. I put new o rings, front bearing seal, and tailshaft seal. I got my trans seal done. It whines just a little on decel in all 4 gears. More in the lower gears. It’s nkt terrible but it hums/ whines a little. It shifts nice and stays in all gears. Idle in neutral with the clutch out it makes a little rattle. Is that the front bearing making that? Should I worry about it ? What a pain in the butt to pull it all back out. Or am I worrying about this for nothing? This is the first 4 speed I’ve ever swapped, mich less driven. So I don’t know what’s normal and what’s not. 90 weight Castro gear lube about 1/2” below the fill hole. Lube was a little foamy so I dropped the level from the fill hole to 1/2” below it. Thanks all.

Does it whine when you let off at speed and put it in neutral with the clutch out? If so then it might be the rear output shaft bearing, if not it probably is in the rear end
If it didn't make any noise before installing THIS tranny then it has to be in the trans.
Please let us know what you find and do

It’s for sure not the rear end. You can hear a little whine and hum in the hump. It was a slant six auto before.

I would fill it all the way up and not worry about it unless it starts getting worse. Neutral gear rattle is a normal noise in many manual transmissions. Some newer ones have a tension plate to lesson that but older transmissions do not. Gears can be noisy, especially old ones that the factory stamped out with an axe so a little gear whine is not concerning to me.

It's hard to say if anything is really wrong with your trans because we can't hear it so just keep an ear on it. If it starts getting worse than open it up. If it doesn't change drive on and be happy.

Some gear noise is normal, although mostly with an 18 spline. I can't remember much noise with a 23 spline???? I don't think it's anything to worry about. If it is something going bad, it will probably get louder over time. Then you will have to pull the trans.

Is your bell housing aligned properly? If its out more than .005 max you can have pressure on your input shaft which can cause all sorts of issues. If your bell housing is not the original to the engine its on its almost certainly off some (or a lot!).

I stuck a magnet and a dial indicator on the flywheel and checked the bell. It was pretty close to .006” or so to center. Did they machine the bells to the blocks at the factory? That’s what I’ve heard they did. I guess I got lucky with this bell and block combo. They aren’t a matching set.