Allison Transmission line pressure upgrade spring. Kit sets minimum pressure and boosted pressure to levels that are a match from 800HP up to 1200HP or more adjustable within the kit.
This kit is recommended for extreme use. Drag racing, dyno and truck pulling.
This is a great upgrade when building your Allison transmission. We have used these for years and highly recommend them! There is no other alternative for the trucks out there with serious power.
This kit also includes a Higher Calibration E Shift Spring (Part# RT-A-ES). Sticking E shift valves can cause codes P1711 or P0872.
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