8th digit on VIN is a \"J\", whats that? i tried to decode the VIN on this chevy cab i have, and it shows the letter "J" in the "engine type and make" section. as shown in my Chiltons manual, this "J" should be for an "El Camino Only" which is a 4.4L v-8 2 barrel found only in an el camino. can anyone help? thanks.