1970 Chevy C20 grinding noise when not on throttle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SinghMann · 06-18-2016, 02:48 PM

I have a 1970 chevy c20 with a 4 speed manual transmission and a 350. One day when I was driving I started hearing a grinding noise from under the cab and I didn't know where it was coming from. I haven't looked into the noise that much but I was wondering if anyone else has heard the same noise. Thanks for the help.

In The Ten Ring · 06-18-2016, 05:27 PM

ttt

snipescastle2 · 06-18-2016, 10:56 PM

Does the noise go away or gets quieter when you depress the clutch pedal? Sounds like it's either a throw out bearing or bad input shaft bearing, could be a carrier bearing too. Nth,
Ben

snipescastle2 · 06-18-2016, 11:11 PM

Does the noise go away or gets quieter when you depress the clutch pedal? Sounds like it's either a throw out bearing or bad input shaft bearing, could be a carrier bearing too. Nth,
Ben

SinghMann · 06-19-2016, 12:57 PM

I believe the carrier bearing is bad but its been bad for awhile and I put a new clutch in not to long ago. Also while changing the clutch I put in a new throw out bearing. So is there a way to check if it's the input shaft bearing?

SinghMann · 06-19-2016, 02:42 PM

Actually I also replaced the input shaft bearing.

snipescastle2 · 06-20-2016, 08:02 AM

If you have already done that much, replacing the carrier bearing would be an easy way to eliminate the rest, however, if that carrier bearing was really worn, that would cause excessive vibration and movement of the driveshaft, transmitting all that through the driveshaft. hope you find the culprit.
Ben

06-18-2016, 02:48 PM	#1
SinghMann Registered User Join Date: Jun 2016 Location: Bellingham Washington Posts: 3	1970 Chevy C20 grinding noise when not on throttle I have a 1970 chevy c20 with a 4 speed manual transmission and a 350. One day when I was driving I started hearing a grinding noise from under the cab and I didn't know where it was coming from. I haven't looked into the noise that much but I was wondering if anyone else has heard the same noise. Thanks for the help.

06-18-2016, 05:27 PM	#2
In The Ten Ring Registered User Join Date: Jun 2013 Location: West Virginia Posts: 6,427	Re: 1970 Chevy C20 grinding noise when not on throttle ttt

06-18-2016, 10:56 PM	#3
snipescastle2 Registered User Join Date: Mar 2009 Location: WARRENSBURG,MISSOURI,64093 Posts: 1,518	Re: 1970 Chevy C20 grinding noise when not on throttle Does the noise go away or gets quieter when you depress the clutch pedal? Sounds like it's either a throw out bearing or bad input shaft bearing, could be a carrier bearing too. Nth, Ben __________________ "Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten”

06-18-2016, 11:11 PM	#4
snipescastle2 Registered User Join Date: Mar 2009 Location: WARRENSBURG,MISSOURI,64093 Posts: 1,518	Re: 1970 Chevy C20 grinding noise when not on throttle Does the noise go away or gets quieter when you depress the clutch pedal? Sounds like it's either a throw out bearing or bad input shaft bearing, could be a carrier bearing too. Nth, Ben __________________ "Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten”

06-19-2016, 12:57 PM	#5
SinghMann Registered User Join Date: Jun 2016 Location: Bellingham Washington Posts: 3	Re: 1970 Chevy C20 grinding noise when not on throttle I believe the carrier bearing is bad but its been bad for awhile and I put a new clutch in not to long ago. Also while changing the clutch I put in a new throw out bearing. So is there a way to check if it's the input shaft bearing?

06-19-2016, 02:42 PM	#6
SinghMann Registered User Join Date: Jun 2016 Location: Bellingham Washington Posts: 3	Re: 1970 Chevy C20 grinding noise when not on throttle Actually I also replaced the input shaft bearing.

06-20-2016, 08:02 AM	#7
snipescastle2 Registered User Join Date: Mar 2009 Location: WARRENSBURG,MISSOURI,64093 Posts: 1,518	Re: 1970 Chevy C20 grinding noise when not on throttle If you have already done that much, replacing the carrier bearing would be an easy way to eliminate the rest, however, if that carrier bearing was really worn, that would cause excessive vibration and movement of the driveshaft, transmitting all that through the driveshaft. hope you find the culprit. Ben __________________ "Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten”



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