727 W/ 904 internals - Page 5

Alan Roehrich · 06-02-2011, 02:13 PM

A "fit all" (fit all meaning fits both Chevy as well as BOPC) TH350C (lock up) case is quite common, the old "fit all" PoweGlide case is rare, but not unobtainable. I have not personally seen a "fit all" TH 400 case, nor had I heard mention of one until now. The 200 4R was only available as a "fit all", most of the TH250C cases were "fit all" as well, and as Mark mentioned, the 700 R4/4L60/65E only came with a Chevy pattern.

In the case of putting a Chevy case behind a BOPC engine, or the reverse, TCI made a thin steel adapter to do it with. The engine families share the same location for the bottom two bolt holes as well as the two dowel pin holes. All you need to do is make up the differences in the top 4 bolt holes. I ran one in my Cutlass when I was developing the 700 R4 for serious street/strip use, as I had a 455 Olds engine in it.

There is no performance advantage to be gained by using a Chevy case behind a BOPC engine for a TH350, a TH400, or even a Metric 200, nor is the reverse, a BOPC case behind a Chevy engine, true.

The Chevy TH400 case has become pretty rare, I have a few that I will not sell unless I sell them as a complete race transmission, and maybe not even then. However, now the BOPC cases have become rare as well, as the crusher is getting 95% of everything built before the mid nineties, many salvage yards do not even pull anything other than the fuel tank before crushing.

Frank Bialas · 06-02-2011, 09:35 PM

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

Phillip marvetz · 06-02-2011, 11:24 PM

Quote:

Originally Posted by Frank Bialas

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

I sent a email to Bob Lang, Div 1 director. He seems to be the guy that get's things done with request's from stock racers. He emailed me back within an hour to let me know he had forwarded my request to NHRA.
blang@nhra.com

06-02-2011, 02:13 PM	#41
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,123 Likes: 1,581 Liked 1,874 Times in 422 Posts	Re: 727 W/ 904 internals A "fit all" (fit all meaning fits both Chevy as well as BOPC) TH350C (lock up) case is quite common, the old "fit all" PoweGlide case is rare, but not unobtainable. I have not personally seen a "fit all" TH 400 case, nor had I heard mention of one until now. The 200 4R was only available as a "fit all", most of the TH250C cases were "fit all" as well, and as Mark mentioned, the 700 R4/4L60/65E only came with a Chevy pattern. In the case of putting a Chevy case behind a BOPC engine, or the reverse, TCI made a thin steel adapter to do it with. The engine families share the same location for the bottom two bolt holes as well as the two dowel pin holes. All you need to do is make up the differences in the top 4 bolt holes. I ran one in my Cutlass when I was developing the 700 R4 for serious street/strip use, as I had a 455 Olds engine in it. There is no performance advantage to be gained by using a Chevy case behind a BOPC engine for a TH350, a TH400, or even a Metric 200, nor is the reverse, a BOPC case behind a Chevy engine, true. The Chevy TH400 case has become pretty rare, I have a few that I will not sell unless I sell them as a complete race transmission, and maybe not even then. However, now the BOPC cases have become rare as well, as the crusher is getting 95% of everything built before the mid nineties, many salvage yards do not even pull anything other than the fuel tank before crushing. __________________ Alan Roehrich 212A G/S