Severe Duty 390 Rear (Includes 850.00 Core)  E-mail this product to a friend

Realize "huge" improvements in acceleration by just bolting-in a 3.90 axle ratio differential. C5's equipped with 2.73's will get up to a full second improvement in 1.4 mile E.T.'s, while 3.42 equipped cars will get up to 4 tenths of a second improvement. There are two options available for the output shaft; for six-speed cars with engine horsepower in excess of 450 we suggest the severe duty version, automatic equipped cars, unless running nitrous, superchargers or drag slicks, will be properly equipped with the standard duty version. Reprogramming of your speedometer will be required and we recommend the Hypertech Power Programmer (it's easy to do)

*A core deposit (Market price) will be added to the price of the differential. The core deposit will be refunded upon receipt and inspection of a re-buildable core ONLY if it is returned within three weeks of the invoice date. Sorry, no exceptions. Cores with axle ratios of 3.15, 3.42 and 3.73 well be excepted.