T-1000-4AC SOCKET, OUTPUT NUT LT1000 2010 ON, ALLISON 1000. 2010-ON. Allison LCT units use a larger spanner nut than the early units.
Accepting a 1/2” drive and weighing in at just over 25oz, our socket is more than just another pretty face. The inner cavity is cut only slightly larger than the output shaft to eliminate any possibility of side-loading the ears. This will shorten its service life, eventually slipping and rounding the uncommon spanner nut: a sure way to ruin your day.
T-1000-4AC pictured with a spanner nut for reference.