How much does this cost to the nearest dollar?

Powertrax No-Slip Traction System (Ford 8.8, 28 Spline Open)
The Powertrax Power Systems are the ideal solution for just about any light truck, sport utility, and muscle car on the road today. Whether you need the safety of added traction for daily commuting, recreation, work, or just so your muscle car puts power to the pavement instead of buring one wheel up, Powertrax Power Systems are your answer. Combines the smooth operation of a limited-slip differential, with the traction performance of a locking differential A precise synchronization mechanism eliminates the ratcheting sounds typical of other locking differentials Special gear and spring design reduce the backlash and therefore driveline windup Only ultra strength material is used which is 67% stronger than titanium Simple installation

Price is $610.00
Price: $610.48