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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by smack, Mar 25, 2002.
I checked the archives and couldn't find it.
Thanks in advance.
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.
The Napa 348 is for a 14 bolt conversion, all of the 10 & 12 bolts that I have had used the same joint.
I have always been told that #447 is for the 14bff conversion.
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.
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.
I dont know when they changed it on the 10 bolts, but mine is definatly bigger than the 12 bolt one.
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.
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