[Chevelle-list] 12 Bolt yoke

[Keith Anderson]

Ryan,

I'm pretty sure the key is what driveshaft and U-joints you had/have.  Every 
1350 style U-joint I've ever seen used a U-bolt style yoke.  Don't quote me 
on this but it's my understanding that driveshafts on cars with  TH400 & M22 
trannys used the larger 1350 U-joints.  My '70 El Camino SS had an M21.  The 
driveshaft had the smaller 1310 U-joints and my original 12-bolt had the 
strap style yoke.   I now have a driveshaft with 1350 U-joints and I had to 
change out my strap style yoke to a U-bolt style yoke.

As far as how that's applied to the different years, I can't say.  My 
limited knowledge is of '70's only.

In case you're wondering how to visually identify the 1310 & 1350 joints, 
the 1310 joints have the retaining clip on the outside of the cup.  It kind 
of looks like @.  The 1350 joint is physically larger and uses a C-clip on 
the inner side of the cup.  If you see one that uses both style retaining 
clips, that's an adapter U-joint.  These let you put a TH400 driveshaft yoke 
on a driveshaft that originally had the small yoke.  So, for example, you 
could swap in a TH400 in place of a TH350 without having to get a new 
driveshaft.  Assuming the length was correct that is.

Keith


From: "langus" <langus at mchsi.com>
Reply-To: The Chevelle Mailing List <chevelle-list at chevelles.net>
To: "Chevelle Chat Forum" <Chevelle-list at chevelles.net>
Subject: [Chevelle-list] 12 Bolt yoke
Date: Sun, 4 Mar 2007 13:39:15 -0600

Are most of you guys running a u bolt or strap style pinion yoke?  I guess I 
am not sure what 12 bolt Chevelles came with?  Mine didnt have one on it 
when I bought the housing and I guess I dont know.  I see a few on ebay that 
use the straps for the u joints.  Are all of them that way?  Chaulk this one 
up the rookie syndrome.  Again.


Thank you
Ryan