[Chevelle-list] 12 Bolt yoke

[Trooper]

On cars with the strap/bolt the flange that is installed into the diff. is 
threaded for the bolts. On cars with the U-bolt the flange is not treaded 
and the U-bolt has nuts that fit on the back side of the flange. So the two 
different yokes would  have different part numbers. There are only 2 part 
numbers for 69. Part number 3964937 is listed 1964-71/ 10 bolt cover. Part 
number 3996118 is listed 1969/ 12 bolt cover.
 My assumption is 3964937 is U-bolt and 3996118 is strap/bolt since I have 
two original 69 12 bolt rears both with the strap/bolt flange and 1 original 
69 10 bolt rear with U-bolt flange.
  With all that said there are many other flange part numbers for other 
years. So the other years may be different. The only year I'm familiar with 
is 69.

Trooper

----- Original Message ----- 
From: "Dale" <396guy at lcisp.com>
To: "'The Chevelle Mailing List'" <chevelle-list at chevelles.net>
Sent: Wednesday, March 07, 2007 1:17 AM
Subject: Re: [Chevelle-list] 12 Bolt yoke


> Keith,
>
> I'm confused here (not hard to do).  If TH400 and M22 cars used the larger
> 1350 u-joints and every one you've seen have a u-bolt, it contradicts the
> others with TH400 transmissions and the strap/bolt configuration.
>
> It gets curiouser and curiouser.
>
> Dale
>
>
>
> --------------------------------------------------------
> 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
>
>
>
>
>