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| | | | Joined: Jul 2009 Posts: 76 'Bolter | | 'Bolter Joined: Jul 2009 Posts: 76 | I have a 1966 C-10 short step. I believe the rear end is the original 373 gears. The truck sat for five years before I bought it. After getting it running five years ago, the rear gears made a howling sound at 50 mph. Now, especially when I turn right, there is a loud banging sound coming from the rear end. I looked to see if the springs were seating properly, the u-joints are tight and the u-bolts were intact. All in all the visual inspection everything appears to be normal. In the last month, I had the rear axle seals replaced – and the shop that did the work didn’t note anything unusual. Any ideas why the banging sound is occurring? | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | posi rear slipping - could try draining and flushing it and refilling, but you may be looking at a rebuild
Bill | | | | | Joined: Jul 2009 Posts: 76 'Bolter | | 'Bolter Joined: Jul 2009 Posts: 76 | Actually Bill I kinda wondered. Before the rear seals were changed I had the GM additive for the rear end grease in there. The bang was less noticible but still there. I'm sure it has lots of miles on it... Should I do a ring and pinion change out or try a different axle? Tim-o | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | I'd check with a rear end specialist, could be salvageable, but a hi-miler may be on its last legs
Bill | | | | | Joined: Jul 2008 Posts: 1,262 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 1,262 | I used a 12 bolt posi in my off topic Model A Hot Rod. It chattered really bad when I first got the car on the road. I ended up using two tubes of GM posi additive to get it to stop chattering. And yes, the posi still works, as is evident by two black tire marks when I put my foot heavy on the foot feed.  | | |
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