Looks like a knock-off the the Eaton Trutrac.
I've got BW78's in the wagon, Number One Son's VL and the Last Daughter's VL. The wagon was a 28 spline, and the VLs were 25 spline. The wagon was initially a VN-VS cone LSD, and the VLs an open centre.
The wagon runs 300kW. Snapped the splines at Eastern Creek. Number One Son was driving so gets the blame, but truth be known it could well have been the floggings I had been given it. It got a knock-off TruTrac, 31 spline Mark Williams axles and a TA Performance cap girdle. Haven't been able to kill it since.
The son's VL runs 200kW. Blew the spider gears out of it. It got a Harrop Trutrac, locally made 31 splines and a cap girdle. Snapped the splines on two axles in two separate incidents. Not happy. Replaced them with Mark Williams axles and haven't been able to kill it since.
The daughter's VL hasn't done many miles. Someone has put Calais disks on the rear. Suspect that when they did so they did not pull axles and replace the drum oil seals with the disk seals as it leaks like the Exxon Valdez. There is a Harrop TruTrac and cap girdle on the shelf, just waiting for the Williams axles to arrive. Might be the first time I have upgraded a diff BEFORE blowing the guts out of it
Cheers,
Harv
327 Chev EK wagon, original EK ute for Number 1 Daughter, an FB sedan meth monster project and a BB/MD grey motored FED.