Thumping from rear end. 2005 GTO
My first post with a question that's probably been asked and answered numerous times already. Would prefer posting my own particular issue to get some input from those who have more experience with this particular GTO than I do. Purchased a one owner, near mint 2005 GTO last spring, dead stock with 26,000 miles. Noticed a slight thumping noise coming from the rear end, seemingly more on the right rear side, upon easing out the clutch and mildly accelerating in 1st gear. 5-6 palpable thumps, which then stopped and the vehicle was fine. No other noises or issues, just the thump. Took the vehicle back, mechanics came to conclusion that it was the traction control and not to worry about it. I've done my share of wrenching on my Pontiacs over the years but Father Time finally caught up with me in that regard, limiting what I can do now, but personally, and from my experience, I think the mechanics made the wrong call here. I'm thinking more of a differential, axle, or possible lubrication issue. Hard to swallow the idea that it's the differential with now only 28,000 miles on it, unless it suffered 26,000 miles of total abuse. I realize it's pushing 11 years of age, and perhaps something else is giving away as well. It hasn't worsened, just remains about the same, with or without the traction control engaged. This will probably be my last muscle car and I want to make sure everything is dead on. If it's a major issue, I'll probably have a GM dealer address it, but could use some ammunition information wise. If it's relatively minor issue, I'll give it a go. You guys are the experts with this one, so any and all opinions will be most appreciated.