I found that the ARJU fits >> 1987-91 truck 5.0 V8 TBI "H" L03 1987-90 truck 5.7 V8 TBI "K" L05 1991-92 truck 5.7 V8 TBI "K" L05 w/o 4L80E 1987-89 truck 7.4 V8 TBI "N" L19 Hope it helps.... get me the ECM number and I will break it down more... thanks Login to read more.