Could be a differential failure, transmission, or universal joint failure. U-joints are easy to check - vehicle in neutral, driveline unloaded (wheels blocked or off ground on jackstands), check for play in any and every direction at each u-joint by pushing and pulling - any slop felt is a worn out u-joint. The other 2 issues take a trained ear to diagnose by yourself. Have one of your buddies hit the gas while you're standing outside the vehicle nearby, and see if you can pinpoint the noise (without getting run over, of course). If you see the driveshaft turn without the wheels moving, then the differential is going to need an expensive overhaul.
I think the one I have is made by Astro. I'll have to look & get the p/n & get back to you on that. But, yeah - well worth the money in aggravation saved. Most new vehicles have ridiculously inaccessible oil filters, except for a handful of them.
GM doesn't help things there, by surrounding it with the oil pan and bellhousing. After my 1st oil change on the Silverado back in '07, I bought a kit similar to this one. Made it 100x easier. https://www.amazon.com/XtremepowerUS-30Pcs-Filter-Wrench-Socket/dp/B015WTI0TQ/ref=sr_1_13?s=automotive&ie=UTF8&qid=1524225408&sr=1-13&keywords=oil+filter+socket+set Of course, that first oil change required 300 ft./lbs. of torque to remove the factory-installed OE filter ... Just did an oil change on a '03 2500HD with the 6.0 & 4L80E. On that one, GM routed the exhaust literally 3" away from the drain plug ... so not only can you not get a socket on it, but the stream of oil hits the exhaust and fans out everywhere, making a huge mess! Some engineering these days, I'll tell ya ...
That's exactly how I learned, only it was my dad and grandpa helping me. Neighbors back in my old 'hood didn't do much but call the cops on my loud bikes, cars, friends, and parties ... Speaking of big sockets, I ran into the same situation trying to remove a front axle from a '04 Ram 2500. Of all the places, Tractor Supply had not only the 3/4" drive, 1-11/16" socket, but a 3/4" drive breaker bar, and adaptors down from 3/4" to 1/2", and vice-versa. Auto parts stores were all a big FAIL on that one. As I'm typing this ... yep ... it's SNOWING again ....
Could have worn out universal joints. BLOCK your wheels, or jack up the rear end & put jackstands under axle, put in neutral, and check for and kind of play in the front and rear u-joints - just grab the driveshaft and try to move it up/down, side to side, and diagonally at each joint. Make sure the driveshaft isn't bound tight if you only block your wheels - there needs to be ZERO tension on it when you check for play. The way you describe the noise also sounds like worn hub bearings, but going up hills wouldn't cause a change in sound there. Cornering would, however.
Jsdirt replied to RyanbabZ71's topic in Off-TopicNo stranger to brake dust running EBC Yellows on the Silverado. In just 200 miles, my front mags are BLACK. Never seen brake dust so bad in my life. Price I'm willing to pay for unbelievable stopping power in a 6k lb. truck, though. Can only imagine how great they'd be in a car. Next time I'll have to see if they make a set for the Grand Marquis. That thing stops just as good as the truck with just it's plain-Jane, stock parts-store pads! I'm a big fan of these things.
That figures. So guys like me that still have flip phones are kept out of the loop. Thanks again, General Motors. Shine a flash light right through the grille - should be able to see everything .... unless of course GM changed that too ...
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