SKU: WIN6811
MPN: 6811 w/9147
The Winters Ring & Pinion 8-3/8in 3.78 Ratio (MPN 6811 w/9147) is a precision gear set engineered for competition quick-change rear end assemblies, specifically designed for the Winters Competition K305 Midget platform. This ring and pinion gear assembly delivers the gear ratio optimization critical to high-performance racing applications where quick-change differentials enable drivers to swap ratios between events or track configurations without removing the entire rear housing.
The 3.78:1 ratio sits in the middle range of competition gear selections, balancing acceleration out of tight turns against top-end capability on longer straights. The 9-spline pinion design integrates directly with Winters K305 quick-change carriers, ensuring proper engagement and torque transmission during sustained acceleration. With an 8-3/8-inch diameter ring gear, this set maintains dimensional compatibility with the Midget chassis architecture while providing the strength characteristics necessary for repeatable competition use. The assembled weight of 10.61 lbs reflects quality construction without excess material.
Buyers in speedway, oval-track, and short-track racing environments rely on Winters ring and pinion sets to fine-tune rear-end performance across varying track conditions. Quick-change systems allow teams to select the optimal ratio for each racing configuration—a critical advantage in competitive venues where track geometry and surface characteristics demand precise gearing. This 3.78 ratio appeals to drivers seeking balanced performance characteristics in mid-speed applications where mechanical efficiency and acceleration response matter equally.
Winters has long dominated the quick-change rear-end market in oval-track racing, and their ring and pinion sets are engineered to exact tolerances for reliable mesh, quiet operation, and predictable torque delivery lap after lap. Compatibility with the K305 platform ensures proper fit and function across the Winters ecosystem of quick-change carriers and support components.
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