[s-cars] Drivetrain binding with new to me EDU 6-speed

[Steve Voit]

S-Heads:

I recently installed an EDU 6-speed, along with new clutch and motor and
trans mounts.

Since the install I now have a 'binding' that occurs in the drivetrain when
I make tight turns such as in a parking lot.  With significant steering
input the drivetrain feels like it's binding up (similar in character to a
4x4 with locked low range differential, but not as significant).  It is
worse with the application of power, and maybe not noticeable under
reversing.  It is accompanied by an audible rumble and 'gear like' vibration
through the seat.

What is causing this?  What could be causing this?

It is otherwise quiet down the road and has no clunks or whines that a bad
diff would indicate.

Kind regards,

Steve Voit

95.5 S6