Whirring noise ISB area

[Fredthecat]

1957 235 Six with 4 speed transmission has whirring noise from input shaft bearing/bushing area. Engine running, sitting still and level, trans in neutral.

Noise stops as soon as clutch pedal is depressed.

Throwout bearing would Make noise when clutch pedal is depressed, eh?

This noise is opposite, goes away when pedal depressed.

Do these 4 speed transmissions have input shaft bearing or bushing?
Is dry installed bearing/bushing a "likely" suspect? Sounds like tranny needs to come out to fix.

Owner states "Transmission was just rebuilt last year" and "Chevy dealer said they all do that"? (no documentation and I've owned several old Chevy trucks that didn't).

ideas?

[dwcsr]

Bearings may be in your future. Could be input bearing and counter shaft bearings, Either way it may need a bearing kit. if it truly has been rebuilt then the trans was run for a long time worn out and the tooth pattern is not what it once was due to wear. If that's the case then some noise is to be expected after new bearings.

[Speedbumpauto]

The last one I had apart was a late 60's and it had a substantial ball bearing for the input shaft. That bearing can possibly be changed without taking the trans apart but it has to be out. Some noise from a ball bearing is "normal" and if the trans shifts and drives properly, I'd probably just put up with it. It could also be gear noise, as suggested above. There's a lot of stuff spinning around, even in neutral. The best fix, IMO, is to put a split exhaust manifold on that old boy and a couple of glass packs. If the obnoxious sound gets louder than the sweet sound, it's time to look in to it.

[geezer#99]

It's likely the TOB spinning cause it's too close to the plate fingers.
Pull up on the clutch pedal to see if it quits making noise.
Do you have a return spring on the fork?

[Fredthecat]

Thanks for the input. Didn't think to pull UP on clutch pedal. It does sound like a TOB spinning more than anything else. Familiar with WWII Dodge and WM300 Power Wagon 4 speeds, they have substantial Input Shaft Bearing.

Oh, and it already has split exhaust, Clifford intake, Holley carb and glass packs... probably was hot rod driven a bunch before current owner got it....and I still hear the whirring noise and hesitate purchase. And asking price went up $1000 because of "transmission work" and obvious Krylon paint job done. Still looking.

And then there's the stuck/unadjusted lifter noise in motor.