[CC5S]

Bill:

Here's a break down of the gear ratio for the Tremec Ford TKO 600's:

TKO-600 (part #5008) 1st = 2.87 2nd = 1.89 3rd = 1.28 4th = 1.00 5th = .64

TKO-600 road-race (part#4617) 1st = 2.87, 2nd = 1.89, 3rd = 1.28, 4th = 1.00, 5th = .82

Both will handle 600 ft/lb torque

If you are looking to race (keep RPM's up) in 5th then you should consider part # 4617. If you want to cruise in 5th then you should consider # 5008.

Also make sure you check into what rear gears your are going to run.