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Fits 2001-2003 Allison 1000-2000 Pump assembly Includes A1-LU-BST Hot Rod Allison Lock Up Valve assembly A1-LU-BST Hot Rod Allison Lock Up Valve addresses Torque Converter slip under Heavy Duty/Race conditions. Significantly increases Lock Up oil pressure with (2) optional springs. We recommend this part for Race use only! Installation recommendation: Experienced technician |