SPARTAN:
Patent pending alignment pins aid install.
Locker installs without side gear thrust washers.
9310 internals.
All Spartans come with a new cross shaft.
Grizzly:
8620 steel case and drive teeth.
Grizzly inner clutch teeth are significantly stronger then the back cut design used in other competitors lockers.
Zip lockers:
High nickel 4320 chrome moly spider gears.
8620 steel case.
Seal housing is located on the OPPOSITE side of the ring gear. Makes it a lot easier to install.
Quick connect air fittings for the bulkhead instead of the ferrule design used on ARB's.
Jason
Jason