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68gmsee · 08-10-2012, 08:19 PM

My 68 GMC has a 3.54 but it's a Dana rear axle. Not sure what Chevy used that's close to that. Also, best way to check for ferrous metal filings in oil is a magnet. If it's a bronze gear you should see the yellow flakes in the oil.

I think your suspicions are correct re. the cam shaft gear. Since you haven't found any problems other than the noise I would continue driving it to see if it diminishes some. If it doesn't I would try to get a new set from some reputable company that is U.S. made. I've seen too many outsourced parts that just don't make the grade these days.

08-10-2012, 08:19 PM	#12
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Timing gear noise after build? My 68 GMC has a 3.54 but it's a Dana rear axle. Not sure what Chevy used that's close to that. Also, best way to check for ferrous metal filings in oil is a magnet. If it's a bronze gear you should see the yellow flakes in the oil. I think your suspicions are correct re. the cam shaft gear. Since you haven't found any problems other than the noise I would continue driving it to see if it diminishes some. If it doesn't I would try to get a new set from some reputable company that is U.S. made. I've seen too many outsourced parts that just don't make the grade these days. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...