Hi;About 18 months ago I replaced the clutch,pressure plate,slave cylinder and the pilot bearing on my 89 F150.I also had the flywheel resurfaced at our local machine shop.It is now chattering especially when starting out in first gear.Could a weak clutch master cylinder be the cause of the chattering?
Thanks for you help. Jack

 

Probably not. Check all of the bolts between your engine and transmission. Check your motor mounts and transmission mount.

 

Probably a warped flywheel. Having it machined may not have resolved the problem.