I tried this upgrade and found an issue that wasn't brought up.
In order for this mod to work, I'm pretty sure you need to have a bodylift of 2" or more. I have the 4" superlift with no body lift and the angle on the flaming river joint is slightly too much. It would bind up at certain points.
I even tried putting 2 FR joints right next to each other to handle the increased angle sort of trying to mimic the factory double cardan joint but you'd need a carrier joint down by the bend to support the shaft.
I spoke with the FR tech support to find a solution but was told it seems to need a double cardan joint which they don't offer.
So I'm out $300+
and ended up having to buy a new factory one (later version 98+). Works fine.
I still have the FR parts hoping to find a double cardan joint down the road if possible or in case I put a bodylift on it.
So just a heads up for everyone without a bodylift....