Hi guys just wondering if the 5 speed box from a 99 156 ts will fit a 2000 spider ts?
Not sure, if they are, but I do know that the 156 uses cables for the gear selection where the Spider if I recall uses a rod/link setup. I don't know if this would prevent a straight swap or not, but it would suggest that the selector unit on top of the gearbox may require changing over and i do not know if they are compatible.
External slave, too.
Ahh yes, completely forgot about that.
So no, they are NOT compatible.