ALLISON PRESSURE REG. SPRING KIT. FITS: 2001-2010 Allison 1000 series. Duramax Diesel Chevrolet, GMC Diesel/Gas Trucks Heavy Duty, Street, Show & Competition. FEATURES: Allison Transmission line pressure upgrade spring. This is a great upgrade when building your Allison transmission. Especially with over 800HP. Special Instructions: Requires professional installation and transmission removal.
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