the top one is for a stock solid axle
the bottom one is for an ifs truck
the ifs trucks come with the cv
In the 1984 factory service manual they show a shaft that looks just like an IFS shaft for the front of a solid axle '84 truck. The shaft that's on my truck right now (the original part) looks just like the IFS shaft too. That's because 84 - 85 front shafts look just like an IFS shaft. The only difference is that the CV on the IFS shaft has less angular range, 25 degrees versus 35 degrees for a solid axle. The differences are all internal and not visible. I already have an IFS shaft so it looks like I neeed to keep looking.
