[Gmecm] Bellhousing Design-Iron Duke

[bcroe at juno.com]

Actually, there were more than 3 bellhousings even for 
something as new as a THM400.  The 64 buick had a 
special round bellhousing, as did Cadillac.  The Cad 429 
had a bellhousing which looked like the BOP, but a couple 
holes were drilled differently.  This also affected the THM425, 
though all 68-78 and later THM325s used the BOP pattern.  
There were other 400s built for RR and Jags, etc.  

Adapters are cool, have done them also.  Bruce Roe

16 Feb 2006 "Jason M." <galaxiecustom500 at sbcglobal.net> writes:
> Just a small addition, the Chevy/GMC and the B.O.P. 
> bellhousing pattern share the dowel pin location and 
> lower mounting hole.  Relatively easy to 
> make an adapter between the two.  Also cheap to buy.
> 
> Jason
> ----- Original Message ----- 
> From: "Andrew Gibson" <andrewsharyn at yahoo.com>
> To: <gmecm at diy-efi.org>
> Sent: Feb 15, 2006 11:56 PM

> > For those who are getting a little excited here, let me shed some 
> light. 
> > GM made 3 different bellhousing designs. The Chev/GMC which can 
> easily be 
> > identified as being the same as a sbc 350. The 
> Olds/Pontiac/Buck/Cadillac 
> > which has the same width as a sbc but looks like a Y on top. Both 
> of these 
> > are strictly rear wheel drive bellhousings EXCEPT on the THM425 
> trans for 
> > early fwd caddy and olds with a V8. The last is the Front wheel 
> drive 
> > design which also was used in the S10 series trucks with a 2.5L or 
> > 2.8L engine. It looks like a trapeziod.