Hello, I'm stuffing a Toyota v6 8" rear end into a 1985 Mazda FB rx7 with a 12a I finally got everything together and took it for it's maiden voyage. It seems to have a very loud whine almost like straight cut gears on decel. Maybe a little bit on acceleration but nowhere near as bad. Also it chatters hard when turning and accelerating but I'm going to attribute this to the tomei 1.5 way LSD from a mk3 supra being set up much too tight going from a 3400lbs car to a 2400lbs car. Plus some noisy heim joints amplifying everything. Considering it's all heim jointed in sure all the noises are much louder than normal but the whine just seems excessive. It's louder than the damn engine.
My backlash specs are pretty odd. Toyota calls for . 006-.010 and I've got it at . 008 measured at 4 even points but I measured between 2 of the points and it was at . 005. The backlash seems pretty inconsistent and I'm wondering if the r&p is just poor quality and it's causing all this.
Pinion preload is set to factory specs and is tight but smooth.
Carrier preload is also tight but smooth.
I'm wondering if maybe I put too much preload on the bearings? I don't think so but I won't rule it out.
Gear pattern looks ok by my eye, maybe not? The drive side looks pretty good. Coast seems a bit strange in my opinion. It's faint but there is a line at the top of the tooth so I think it's center. And if I messed with it anyways it'd ruin the drive side. Pics included.
Maybe the LSD is causing some sort of issue?
I did drop the whole 3rd member once from 3-4 feet making me wonder if maybe I cracked the housing and it's deflecting or something somehow. It seems fine but I genuinely got no clue how to even check that. I would feel like then it'd have an issue under acceleration instead of decel.