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    Haibeck Automotive Technology



Rear Axle Gears


Upgrading the rear axle gear ratio probably has the best benefit per dollar with respect to major upgrades. The 4.10 ratio is the most popular upgrade. 3.73 and 4.30 ratios are also available.

The principle benefits of a 4.10 ratio are:


16% more torque to the wheels at all speeds


Sixth gear becomes a useful gear. The car can be maneuvered in traffic at 65 MPH without downshifting.


Has a broadening effect on the useful power band for the LT5. The throttle response is as good at 3000 rpm as it is at 4000 rpm with a 3.45 gear ratio.


Incredible throttle response in first and second gears


The car completes the quarter mile in fourth gear at about peak power, 6000 rpm for a 400 hp engine. 6400 rpm for a 500 hp engine.

The installation includes; Removal and replacement of the gear case assembly, A Dana Super 44 Plus gear set, Four Timken bearings, Three National seals, Amsoil 75W-90 synthetic lubricant, The friction modifier additive, and Speedometer correction gears.

4.10 $2160. 4.30 $2105. 3.73 $1715.

Optional drain plug, $40.

A gear case assembly can be shipped in for a gear set upgrade. The installation includes; A Dana gear set, Four Timken bearings, Three National seals and Speedmeter correction gears. 4.10 $1800. 4.30 $1745. 3.73 $1355., plus packing and shipping.

The Dana gears will run quietly if a contact pattern like this is obtained. A good contact pattern is large and has rounded edges.

4.10 ratio RPM Verses MPH Chart