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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: oldblue76 on September 30, 2015, 04:02:54 pm

Title: SM465 Clunking Noise
Post by: oldblue76 on September 30, 2015, 04:02:54 pm

I have a 1976 Chevy K10 w/ 350 and a SM465 transmission. I have a clunking noise when I'm in 3rd gear driving down the road. When I let off the gas there is a clunking noise and then when I push the gas again. The U-joints are fine the the noise is coming from the transmission area. I assume it's the transmission, any suggestions on how to fix it?

Title: Re: SM465 Clunking Noise
Post by: Irish_Alley on September 30, 2015, 07:21:52 pm

and its not with any other gears? could it be the trans mount?

Title: Re: SM465 Clunking Noise
Post by: oldblue76 on September 30, 2015, 07:41:59 pm

Just 3rd. And I would have to look at the mount

Title: Re: SM465 Clunking Noise
Post by: enaberif on September 30, 2015, 08:43:39 pm

3rd is a very notorious gear to start failing in a SM465. Might need a rebuild.