Soft Caterpillar 1851223-00, rating 549HP@2100rpm; 1849LB-FT@1200rpm. 1995 550 HP 1850 PT Truck | | Low NOx Kit Software | | 5EK00000-up | | SOFTWARE DATE CODE: Dec99 | | INTERLOCK CODE: 341 | | Rating#1: | | 549HP@2100rpm, | | 1849LB-FT@1200r