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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:
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 and 4.30 ratios. $2108. 3.73 ratio. $2149.
Optional drain plug, $40.
Gear cases can be shipped in for a gear set upgrade. The installation includes; A Dana gear set, Four Timken bearings, And three National seals. 4.10 and 4.30 ratios $1340., 3.73 ratio $1628., 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