need 14 bolt swap u joints

[k51977blazer]

Ok i have a 1977 blazer with 350 i recently swapped the 12 bolt for a 14 bolt.My u joint dont work so i look on here and it said i needed a 1350 series u joint ok when i called advanced auto parts they had no clue should i just tell them i need one for a 3/4 ton truck,what should i tell them i need.Also i know i need to make a trick joint use the caps of the one for the 12 bolt what side does that go on the driveshaft or the diffrential

 

[chevydan3]

Tell them that you need a 1310-1350 conversion u-joint. If the crappy kragen/autozone/advance goons don't know what you are talking about, go to your local driveline or 4x4 shop. Summit racing has them too.