I was just wondering 1... the advantages of going with a propane setup over diesel or gas and 2...What is the stock pinion or diff housing angle on a 40...I have just finished a spring over but need to weld up perches and such. Everything is basically bolted together but I want to get the right angle before I weld it up. I was told by a local 4x4 shop that anywhere between 6-13 degrees would be fine. As it sits now, front pinion angle is 6 degrees and rear is almost 10. Any info would be great.