Soft Caterpillar 1900223-00, rating 335HP@1800rpm; 1250LB-FT@1200rpm; 370HP@1800rpm; 1349LB-FT@1200rpm. 335/370 1250/1350 MT4 Truck | | Low NOx Kit Software | | SOFTWARE DATE CODE: Dec99 | | INTERLOCK CODE: 304 | | Rating#1: | | 335HP@1800rpm, | | 1250LB-FT@1200rpm | | Rati