The Acro quick-change rear end is designed with an open axle shaft of either high-strength aluminum or heat-treated steel. This axle is driven by a ring and pinion gear set mounted in a cast aluminum housing. The back section contains the quick-change gears. The housing may be located anywhere on the axle anywhere between the chassis carrier bearings according to your installation requirements.
A standard axle is 45" long, with the ring gear housing located 2" to the left of the axle center, so that 201⁄2" of the axle is on the left and 241⁄2" is on the right. As stated, special locations are available.
Change gears are located in the rear of the housing and are easily accessed by the removal of a cover plate. Many ratios are available using the same ring and pinion; see charts with each rear end.
The lower shaft transmits power to the change gears at the rear of the housing. The cable-controlled internal shifter acts as an in-out clutch.
We can supply rear hubs with standard 4-bolt or 6-bolt patterns. Wheel centers are also available for splined axles. Several brake kits are available for easy bolt-on installation.
Rear end assemblies are available with a steel axle, keyed aluminum axle, or splined aluminum axle in sizes from 11⁄4" to 13⁄4" diameter.
Conversion Kits for Rear End
Any Acro rear end can be converted to a different style, retaining many existing parts.
To convert from a steel axle to an aluminum axle: Includes aluminum axle, aluminum ring gear carrier, adjustable aluminum hubs, chassis carrier bearings, misc. hardware.
To convert from a 3-bolt center housing to a 4-bolt internal shifter: Includes center section, rear cap, lower shaft, shifting parts, misc. hardware.