Squirly rear end - Subframe, Diff bolts, diff?

My 09 just turned 50k miles. For some time now the rear end has felt pretty sloppy when putting down power. From a launch you can feel the right rear and left not having similar traction. At the shift if feels like the right rear is pushing back while left has no similar feeling if that makes sense. I think the right rear may be spinning more and left not from a bad limited slip. It has a very similar feeling to an open diff car. It doesn't feel like the two rears are connected like a proper limited slip equally putting down the power like my old p car did with LSD or old e46 m3 for that matter really.



I know many have said this is an indication of poss broken diff bolt but I have looked under and didn't find them broken and checked the torque on the diff and subframe and they seem fine. My thought is that the subframe bushings are toast as when putting the power down through corners it also seems to make the car wander a bit and I'm told if the sub frame is moving it will throw off the geometry toe and the like and make the car hunt around like that. It sort of reminds me of the wasted feeling of bad rear trailing arm bushes in my old e46 m3 but different.



Recently given this weird traction issue and how the car feels weird putting power down through really tight corners, I'm wondering if the differential's limited slip is toast. I've read all the articles but there is no real description of the three indicia of 1. Bad subframe/diff bushes, 2. Bad diff, 3. Broken Diff bolts.



Given the rain, the other day I was leaving a light with a painted crosswalk. I put the power down and I swear the right rear only started spinning and the traction control shut the car down which weirded me out. This makes me think the diff is bad as well as the right rear traction difference at shifts.



None of these issues presented until the car was doing some weird clunking back around 25k miles. At that time, I finally got all sorts of warning messages and took it in to the dealer where they diagnosed and replaced the rear speed sensor. I believe they have to take apart the rear end to pull an axle to replace same. If so, I'm wondering if they boogered the job since after then the traction from the left and right has never been the same. I swear it feels at times like an open diff. I'm wondering if the bastards swapped out my diff for a wasted one. It almost feels like that honestly.



Thoughts any help? It's really getting annoying. From what I've read it seems like at a minimum my subframe bushings are toast and possibly the diff bushes too. I guess I can upgrade to the solid subframe bushes and replace the diff bushes with stock as I don't want it too noisy back there.



The car is under an extended warranty, so I'm thinking I will bring it in and complain and see where that gets me. Suggestion on where to take it in SD? SD previously did the speed sensor work. FYI I will never take the car to Encinitas ever after they curbed both rims then blamed me for it when I picked the car up and the rims were sitting directly on the fucking curb. Also, I'm pretty sure their parts guy fradulently used my cc as right after I bought some parts I got tons of fraud calls and had to have the damn card reissued.



Is there an easy way to check the diff operation? Jack up one tire and try to spin the other type of deal? Btw, I have never tracked the car but I do take it for spirited drives wherein I driver it harder than the majority of people that track cars as I have a professional racing background. The car should be able to handle this though.



Any help is appreciated. This is really getting to be more than annoying as it's really squirly under power even in just normal driving. Thanks!