First I like to thank everyone on the great info you have provided me in the past My recent problem; After installing a T5 in a 72/351C I have vibration in the trans, the shifter shakes when in all gears.Now if I let off of the gas or on I can find a spot where it is smooth.If I coast out of gear it is smooth If I go 55mph it is smooth Is it the trans or drive shaft?