All the T5's were behind "modern" engines/bellhousings with just the engine block mounts, thus they needed a tailshaft support.
Are you talking about the old cast iron Chevy bellhousing??
I've heard both yes and no to this. With the dual bellhousing mounts, it's probably not necessary to support the tailshaft. Millions of them were, and still are, in service with a 3 speed hanging out behind with no support.
However, as an "overbuilder" I was planning on using a tailshaft support also (TKO-500). I would think it should provide "gentle support" but not be too rigid -definately rubber, not polyurethane in my opinion.
