727 W/ 904 internals - Page 4

Mark Yacavone · 06-01-2011, 02:35 PM

Quote:

Originally Posted by Phillip marvetz

Mark,
It's a fact that they were using a modified chevy case, Why? I don't know and don't really care.

PM me with the details... I'll investigate it.

Yes , I agree . Everybody gets an Ultra Bell...or nobody!

Rory McNeil · 06-01-2011, 06:07 PM

I have also seem many GM automatics that had both the Chevy and the "BOP" bellhousing patterns.

Bill Edgeworth · 06-01-2011, 08:32 PM

Phil,
Like Mark said I have no idea why a Pontiac guy would do this. For the amount of work it would take it would be easier to stuff the guts of the transmission into a BOP case.
All the same trans used in performance applications the Turbo 400, 350, metric 200 and PG were all available with a BOP case and there are lots of cores out there. And as Rory said there is also the dual pattern cases.

Phillip marvetz · 06-01-2011, 11:03 PM

Maybe the chev case is stronger than the BOP?
Anyway's I wasn't trying to pick on the guy's that did it, Just knew that it had been done and that it was protested and NHRA did nothing about it.

Now back to the subject,
Mark, Can I bolt a 727 tailshaft to a 904? I don't want to build a new driveshaft, LOL

Mark Yacavone · 06-02-2011, 12:27 AM

Don't know that one .I'm a GM guy, and an occasional C4.
I'm sure someone here can tell you more...Maybe Alan?

GTX JOHN · 06-02-2011, 02:56 AM

Phillip: I Do not believe that it would be very possible or economical to exchange Tailshafts......................................
Trans output shaft are different in length and diameter as I recall andmaking
a output shaft would be a small fortune. Both tail shaft have rear mount in same place and take same transmission cross member . The yolk is twice
the size on front of drive shaft on 727 than on 904. Nevertheless , it would
much easier to make a new drive shaft or rework a stock one than modify
the transmission!
I am sure that there are some transmission builders than can give you
better advise than I can.................I have not rebuilt my transmission since
the 80's. More effective to just cut a check to Pro Trans and cheaper
in the long run with my skills.
Phillip: Will answer your E mail tomorrow.

Jeff Goss · 06-02-2011, 08:10 AM

Quote:

Originally Posted by Rory McNeil

I have also seem many GM automatics that had both the Chevy and the "BOP" bellhousing patterns.

I think this was the Cadillac automatics. I have seen one in person.

Mark Maez · 06-02-2011, 11:46 AM

Quote:

Originally Posted by Phillip marvetz

I just sent an email to NHRA requesting we be allowed to use an adapter, If enough of us do this we may get somewhere.

Phil,
send me the info I'll send a request also

Rory McNeil · 06-02-2011, 01:55 PM

Quote:

Originally Posted by Jeff Goss

I think this was the Cadillac automatics. I have seen one in person.

I don`t know Jeff. I`ve seen the multi pattern Turbo 350`s & 400`s in a number of none Caddilacs. Not sure what the reason was, other than maybe streamlining inventory?

Alan Roehrich · 06-02-2011, 02:03 PM

Quote:

Originally Posted by Phillip marvetz

Now back to the subject,
Mark, Can I bolt a 727 tailshaft to a 904? I don't want to build a new driveshaft, LOL

Never tried that, I don't have the parts here to compare, but I doubt it.

Like Mark, I do a lot more GM stuff than anything else, I can do all sorts of tricks with GM stuff, from PowerGlides to the latest stuff. The Ford and Chrysler stuff I can build really nice race transmissions with, but "trick interchanges" are out of my league.

06-01-2011, 06:07 PM	#32
Rory McNeil VIP Member Join Date: Jun 2007 Location: from Vancouver BC Canada, now in Nova Scotia Posts: 1,311 Likes: 317 Liked 1,104 Times in 302 Posts	Re: 727 W/ 904 internals I have also seem many GM automatics that had both the Chevy and the "BOP" bellhousing patterns. __________________ NHRA 6390 STK M/S 85 Mustang

06-01-2011, 08:32 PM	#33
Bill Edgeworth Member Join Date: Oct 2006 Location: Tacoma, WA Posts: 258 Likes: 0 Liked 0 Times in 0 Posts	Re: 727 W/ 904 internals Phil, Like Mark said I have no idea why a Pontiac guy would do this. For the amount of work it would take it would be easier to stuff the guts of the transmission into a BOP case. All the same trans used in performance applications the Turbo 400, 350, metric 200 and PG were all available with a BOP case and there are lots of cores out there. And as Rory said there is also the dual pattern cases. __________________ Bill Edgeworth 6471 STK

06-01-2011, 11:03 PM	#34
Phillip marvetz Senior Member Join Date: Oct 2008 Location: Lynden ,WA Posts: 820 Likes: 0 Liked 3 Times in 3 Posts	Re: 727 W/ 904 internals Maybe the chev case is stronger than the BOP? Anyway's I wasn't trying to pick on the guy's that did it, Just knew that it had been done and that it was protested and NHRA did nothing about it. Now back to the subject, Mark, Can I bolt a 727 tailshaft to a 904? I don't want to build a new driveshaft, LOL __________________ 2009 V/SA Record Holder

06-02-2011, 12:27 AM	#35
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,816 Likes: 2,906 Liked 5,121 Times in 1,952 Posts	Re: 727 W/ 904 internals Don't know that one .I'm a GM guy, and an occasional C4. I'm sure someone here can tell you more...Maybe Alan? __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

06-02-2011, 02:56 AM	#36
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,802 Liked 2,486 Times in 697 Posts	Re: 727 W/ 904 internals Phillip: I Do not believe that it would be very possible or economical to exchange Tailshafts...................................... Trans output shaft are different in length and diameter as I recall andmaking a output shaft would be a small fortune. Both tail shaft have rear mount in same place and take same transmission cross member . The yolk is twice the size on front of drive shaft on 727 than on 904. Nevertheless , it would much easier to make a new drive shaft or rework a stock one than modify the transmission! I am sure that there are some transmission builders than can give you better advise than I can.................I have not rebuilt my transmission since the 80's. More effective to just cut a check to Pro Trans and cheaper in the long run with my skills. Phillip: Will answer your E mail tomorrow.