727 W/ 904 internals

Mark Yacavone · 06-01-2011, 02:56 AM

Quote:

Originally Posted by Phillip marvetz

Which point Mark? If it is the pontiac/chev trans you need look no further than a certian Firebird. They were protested a few years ago ( At Fallon I believe) and NHRA wouldn't do anything about it. Am I mistaken?.............

Any GM trans worth a crap was made in Chevy and BOP configuration ,or both.
There was even a BOP Powerglide case .
The Chevy pattern 904 mail truck trans isn't legal in S/SS, but still it bolts right up.
The 700R4 o/d is Chevy only, but nobody uses that.
I just don't know what issue you're talking about.
PM me if you want to.

Adger Smith · 06-01-2011, 06:08 AM

Mark,
The Chevy pattern Mail Truck 904 "is" legal in certain SS classes.

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

Mark,
It's a fact that they were using a modified chevy case, Why? I don't know and don't really care. I don't have to run them heads up so it doesn't concern me.
What does concern me is that GM and Ford racers get to do something Mopar racers aren't allowed to do. The JW bellhousing to bolt a 904 to a big block costs about $400, A protrans is $4000-$5000. It doesn't make sense.
How many GM racers have had to throw away a repairable case because of a cracked bellhousing? This would be a good fix for them also. If NHRA is going to let the Ford racers use an adapter then we all should get that option. Right?

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

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.

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?

Ed Wright · 06-01-2011, 11:49 AM

Quote:

Originally Posted by Adger Smith

Mark,
The Chevy pattern Mail Truck 904 "is" legal in certain SS classes.

Just the hood scoop cars, right?

06-01-2011, 06:08 AM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: 727 W/ 904 internals Mark, The Chevy pattern Mail Truck 904 "is" legal in certain SS classes. __________________ Adger Smith (Former SS)

06-01-2011, 11:03 AM	#3
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 Mark, It's a fact that they were using a modified chevy case, Why? I don't know and don't really care. I don't have to run them heads up so it doesn't concern me. What does concern me is that GM and Ford racers get to do something Mopar racers aren't allowed to do. The JW bellhousing to bolt a 904 to a big block costs about $400, A protrans is $4000-$5000. It doesn't make sense. How many GM racers have had to throw away a repairable case because of a cracked bellhousing? This would be a good fix for them also. If NHRA is going to let the Ford racers use an adapter then we all should get that option. Right? __________________ 2009 V/SA Record Holder

06-01-2011, 06:07 PM	#5
Rory McNeil VIP Member Join Date: Jun 2007 Location: from Vancouver BC Canada, now in Nova Scotia Posts: 1,311 Likes: 317 Liked 1,106 Times in 303 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	#6
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	#7
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

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