I did a search a few days ago and found this info and now I can't find it again. Then again I have done 100 searches the last couple of days. Getting everything together for my lift and axle swap. I am putting a 3/4 ton 14B SF in place of a 1/2 ton 12bolt I know I need the U-joint conversion kit. Found 2 diff part numbers while searching but now I can't remember which I need. I am 99.9999% sure it is part # 348 but I also know there is a part 447. Ithink the 348 is for 3/4 ton and the 447 is for 1 ton. 348 is a u-joint conversion for a 1310 to a 1350 447 is a u-jiont conversion for a 1350 to a Saginaw 44. which one is it.