Installed spec 3+ clutch and 26 spline input, checked end play and thought I did everything right, new TOB, retainer sleeve, and pilot bearing. Put it all back together and used penzoil synchromesh. Car drives fine and shifts fine, but when in neutral with clutch engaged the trans chatters, push clutch in and it goes away. You can hear it just with the car running and standing next to it, it's pretty audible. Took it trans shop and they pulled everything apart and said it all looks good to them, even compared the number of teeth on the new shaft with the stock 10 spline shaft and the angle of the teeth. Trans shop owner keeps saying. It could just be a combo of they way the new shaft gears are cut and using the lighter weight trans oil. Any ideas? About to get a new shaft to try another one to see if that's fixes the problem