Hey sorry to hear about your situation with the chatter and rear diff. I to had a Lw F1 flywheel installed along with a Exedy clutch on my 350 nismo and it was noisy as hell. Petal felt light. I was really upset at first. Also I noticed the car lost its balls on the lower revs and didn't pull hard on acceleration. Yea, It reved up faster no doubt but it felt like it lost its tq. I asked myself over and over again.. Was this upgrade worth it? I just learned to live with my decision and adapt to the cars feel. If i had to do it all over again ima stay with the OEM fywheel.
As far as the rear diff Id wait and see what the shops manager had to offer you B4 you put them on blast. Give us a follow up on the outcome. Btw bday. I'm sure your gonna be satisfied when its all over with. Your patience is a virtue in this case. Gl
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