I was looking at your fully built IFS differentials with a Spartan, and noticed they say they are for the V6 or 4Cyl. But it doesn't give an option for the if you have a V6 or a 4Cyl., truck, and it doesn't specify if these differentials can be used in vehicles with ADD. I know that the ADD vehicles came with an additional needle bearing in the side of the carrier, and the V6 differentials have a larger bearing than the 4Cyl. trucks.
Do you replace the needle bearings in the ADD front ends, or are the original needle bearings re-used? Also, how do we choose between 4Cyl., and V6?