Well, after spending some time looking at the Factory Assembly Manual and re-education myself to the proper terms for the cross members of an AD truck (yes I fell like a dummy) I have to start from scratch. For a 3100 there are 4 cross members. The front cross member, the rear engine support, the second cross member and the rear cross member. In my previous post I said the second cross member but that was wrong. I should have said the transmission support or even a propeller shaft support. Attached are examples collected from searching.
Last edited by buoymaker; 12/08/20209:06 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
