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That's the general conclusion w/o tearing into it. Sent videos to RPM and ECS, and they both said rear diff. The car has a DTE stage 3.
I will be taking it to RPM for clutch install and rear diff rebuild in the next couple of months.
I put the DTE rear in brand new 12 years ago, proper break in, and then sold the car. That guy put 800 miles on it and sold it to the guy I bought it back from. The car only had 13k miles put on it since I sold, but the last guy that had it changed the rear diff fluid when he got it...at 25k miles or so for whatever reason?!?
Would running the wrong type of rear diff fluid cause it to go bad? I checked the level, and level is fine, but I even had metallic on my finger from checking level. I have no clue what type of diff fluid he used? Thoughts?
I know this is 3 years old, but wondering what you found out when they did the work
Thats what I am thinking. I have the exact problem. Sounds for all the world, like it is coming from the clutch location, and not the rear end.
I have a whine from my diff and it's not even close to that sound its coming from the front. II have the same symptoms, when you just put a little load it whines, but it comes from the back. Its 20ys doing this and i even rebuild. My car has some hp to. With 345/35/18 DR.
About 5 years ago I rebuilt my torque tube, new bearings and couplers. There was a little whine from that... re-rebuilt it a couple years later, again new bearings and couplers, and that fixed it.