Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

10Bolt to 12Bolt u-joint NEED PART NUMBER

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by smack, Mar 25, 2002.

  1. smack

    smack 1/2 ton status

    Joined:
    Feb 24, 2000
    Posts:
    277
    Likes Received:
    0
    Location:
    Colorado
    I checked the archives and couldn't find it.
    Anybody??
    Thanks in advance.
     
  2. Hossbaby50

    Hossbaby50 3/4 ton status

    Joined:
    Sep 1, 2001
    Posts:
    8,972
    Likes Received:
    0
    Location:
    Peoria, AZ
    I heard the other day it is Napa #348. I am not 100% on this, but I do remember reading it about a week ago or so.
     
  3. bigmack

    bigmack 1/2 ton status

    Joined:
    Jan 3, 2002
    Posts:
    478
    Likes Received:
    0
    Location:
    Tennessee
    The Napa 348 is for a 14 bolt conversion, all of the 10 & 12 bolts that I have had used the same joint.
     
  4. Hossbaby50

    Hossbaby50 3/4 ton status

    Joined:
    Sep 1, 2001
    Posts:
    8,972
    Likes Received:
    0
    Location:
    Peoria, AZ
    I have always been told that #447 is for the 14bff conversion.
     
  5. DesertDueler

    DesertDueler 1/2 ton status

    Joined:
    May 23, 2001
    Posts:
    3,106
    Likes Received:
    0
    Location:
    Phoenix, AZ
    Just replace the 12 bolt yoke with your 10 bolt yoke. The 12 bolt u-joint is alot smaller than the 10 bolts for some reason, but the 10 bolt yoke fits with no problem, just use a 10 bolt pinion seal as well, thats what I did to the 12 bolt in the Jimmy.
     
  6. bigmack

    bigmack 1/2 ton status

    Joined:
    Jan 3, 2002
    Posts:
    478
    Likes Received:
    0
    Location:
    Tennessee
    The 348 & the 447 are both 14 bolt conversion joints, I think the difference in the two is that the 348 has the locks that go on the outside of the cup where the 447 has the locks that go on the inside. That is how it was explained to me anyway. Maybe the newer 10 bolts have a bigger joint than the older ones, the 10 & 12 bolts I have had all had the same size joint.
     
  7. DesertDueler

    DesertDueler 1/2 ton status

    Joined:
    May 23, 2001
    Posts:
    3,106
    Likes Received:
    0
    Location:
    Phoenix, AZ
    I dont know when they changed it on the 10 bolts, but mine is definatly bigger than the 12 bolt one.
     
  8. smack

    smack 1/2 ton status

    Joined:
    Feb 24, 2000
    Posts:
    277
    Likes Received:
    0
    Location:
    Colorado
    Yeah, I'm hearing that it's either the same or smaller so I'll just have to wait and see after I get my rearend. I'll probably switch the 10 bolt yoke back in when I have my gears down though.
    Thanks all!
     

Share This Page