The over-axle section is different because it probably has a fuel tank behind the axle that will interfere with the exhaust designed for a pickup.
I just put an MBRP on the 550 and for the time being I just cut a section of the over-axle tube out and used it as a turn down/out. It shoots the exhaust out just forward of the rear and down at the ground at a 45 out and 45 down.
Works for now.
Maybe someone else can tell you where to get an over-axle tube.
yea it does have the fuel tank in the back, and i forgot he bought it real cheap and its got 283,000 miles its a 6 speed and when you get on it, from like 1800 to 2500 it doesnt have much power, it just falls on its face i was thinking that this might be the hpop or the injector o-rings. what do you guys think. i just bought a 17* to put in my truck, the one in it work fine but i want more so i was just going to swap it into his, would that be a good idea. thanks
Apparently life caused it because the radiator shop was full of Ford cab/chassis fuel tanks that were the same way...
I would check if I had a 550. Although there's usually no easy way to on these trucks because they usually have a crap-load of junk stacked over that tank . The little mixer valve in the pickup on mine was FULL of it. The strainer grid in the foot was also almost completely blocked with it.
It was also all in the fuel bowl on the engine. It looks EXACTLY like aluminum shavings. Except when you rub it between you fingers it just turned to goo.
Not a good thing for your fuel system. I'm almost positive it cost me some plunger and barrel assemblies because the truck has a slight miss now....