I have an 83 Blazer with 700r4 np208, had a 12 bolt rear...... I just mounted the 14bltff have not welded the spring perches yet need to center and get the angel but need the conversion U-Joint to get the right angle of the drive shaft and yoke..... thing is I got the Napa 348 Conversion U-Joint which everyone on the other posts (yes I used the search) have said to use for a 12blt to 14bltff swap and it is not even close to the one I need ....the 348 is a clip retained U-joint the one that is on my truck is the cap retainer type....... Also the "1310" size of the conversion joint is smaller than the "1310" size on the stock joint???? Any ideas of what joint I should be using? I know the 14blt is a "1350" but, what is my drive shaft size since it is bigger than the "1310" on the conversion and it is a "cap" retainer not an outside clip retainer like the conversion joint. HELP i am wanting to weld these spring perches in the morning Napa is open at 9a.m. and I want to be at the door when they open with the right part number in hand. Thanks for your help.