[bret a ewing]

Had one issue with a TKO 600 w .6 od. VIR 2006 open track, last day, last session.
135 miles on trans, in cobra. 25 track miles prior to failure.

To preface, 1/2 the time I could not catch reverse on the first direct engagement try (push right/pull back). Had to row neutral a couple of times and slot 5th, before rev would mesh. Figured the quirk was the new box not fully broken in.
Anyway, on the grid, the car in front of me could not get started. Went to back up and go around (I was excited so I was pretty aggressive with my shift) and "POP". Cracked the linkage between 5th and rev. (Looks like a mini connecting rod). After analyzing trans, linkage was not adjusted properly. Blocking pin hung up.

Ordered new trans - TKO 600RR, under warranty, had it torn down, re-shimmed and readjusted by my local tremec rep.

Smooth as silk, no problems so far, 1000mi. Satisfied with performance.