i just installed a kartboy shortshifter with front and rear bushings. The shifts are amazing and tight and everything clicks into gear properly however. in fisrt giear when i let go of the accelarater to shift into second as the rmps go down i hear a moaning noise and in third or second when im at around 3 grand and i let go of the accelarater when the rpms are going down i hear a rattleing noise or moaning from the tranny. its like a vibration noise of some kind. the performance of the car in normal just the noises are bothersome. is there a known fix for this issue?>? _Please advise. thanks in advance.