Gearbox Mounts

[GHaynesTR4@aol.com]

Last winter I installed a new (Moss) gearbox mount in my TR4A.  In driving 
the car 
since then, the driveline vibrates on decelleration, as if the mount is made 
of rubber which is too soft.  I usually shift to neutral and coast to a light 
or corner, an unorthodox driving style!  Has anyone had this experience, and 
can I buy a mount 
made of harder rubber somewhere?  How about the front mounts - similar 
problem?
Thanks!
George Haynes