Whirring noise ISB area - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Fredthecat · 01-10-2014, 02:31 AM

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?

01-10-2014, 02:31 AM	#1
Fredthecat Registered User Join Date: Dec 2013 Location: California Posts: 80	Whirring noise ISB area 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?



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