All I find in my Hollander is 4.11 for 67-72 automatic with coil spring suspension. I may have been thinking of the 3.90 for 4.11 swap for 1/2 tons. Something interesting I learned a few months ago when I traded my 06 pickup on an 09 is that since 07 a 3.73 ratio is offered. I traded for one and the 3.73 really makes a difference over the 4.10 that was in 3/4 tons for years. It has the 6L with the 6 speed auto. It gets as good a fuel mileage as a half ton on the highway and pulls a trailer like a Diesel. I spoke with one of my cousins old parts men. He owns a Chev dealership and a GMC dealership. He will look through some old books when he has time.

Last edited by crenwelge; 10/07/2009 12:03 AM.