Check the listing for details. MONKEY GRIP POSI LIMITED-SLIP DIFF- Extreme Progressive- GM 10 BOLT 8.5 - 28 SPL. Condition: New. Listed at 549.44 USD. MONKEY GRIP POSI LIMITED-SLIP DIFFERENTIAL - Extreme Progressive - GM 10 BOLT 8.5 inch - 28 SPLINE Not a cheap factory Gov Lok knock off. This is an aftermarket progressive traction differential with worm gear technologies (read: no wearing friction plates!), allows for aggressive grip under load, while allowing for smooth and light tight turns. From wild to mild, when you are looking for something better than stock or cheap aftermarket, this is it! - BEARING JOURNALS MAY BE LARGER THAN STOCK AND REQUIRE DIFFERENT BEARINGS AND RACES - GM 10 BOLT 8.5 inch - 28 SPLINE *** International Customers: We ship UPS and use their standard assigned brokerage *** International Customers: Additional fees, taxes & other customs related costs are the responsibility of the buyer Need Help Before, During or After Installation? Live Phone Tech AvailableWhether you are a novice or a pro, you will need a good and easy to use bearing puller for the job, and we got them! >> For a great Differential Bearing Puller Kit, click here