"Thick Case" Turbo 400?!?!

I've seen this ad on C'List here for a couple months, (surprising)!

https://baltimore.craigslist.org/pts/d/davidsonville-pontiac-olds-buick-turbo/7071978884.html

 

Wow he is smoking. These case are not that rare.....

 

Thick case THICK CASE Thick Case
That guy must be pretty thick in the head

 

Oh look. Here is one . Found just that fast

https://dayton.craigslist.org/pts/d/pontiac-th400-rebuilt/7093175888.html

 

I dont know why alot of these came in long shaft in big cars

 

https://buffalo.craigslist.org/pts/d/buffalo-1968-bop-th400-transmission/7103383926.html

And another.........if I was closer to buffalo I would buy this

 

I have several. What an idiot.

 

If I have the time,I would pull all of mine out for a picture and send to him,but I’m not wasting the effort. Maybe I should send a picture of my Reid-case TH400.

 

So out of curiosity what is a thick case and why is it desirable?

 

Slightly stronger case,..More so in the bellhousing area,...nothing special

 

It's just the earlier style, correct?
Like up to 69.

 

No they used them later too.

They also have a thicker pan rail and a stiffing rib head towards the output shaft to go along the thicker bellhousing and extra webbing support in that area.

 

Can we please see some pictures of that Reid Case?

 

Should like like this I would assume with an aftermarket bellhousing


https://www.jegs.com/i/Reid+Racing/...qGX8hq5VffPtHm7TA2_aIAx9q5D16WvBoCkDkQAvD_BwE

 

I've got 5 rite now,..they all are later model longtails and two Pontiac short tails

 

and another few more.

https://sacramento.craigslist.org/pts/d/roseville-hughes-racing-th400/7109441854.html

https://sacramento.craigslist.org/pts/d/bpo-buick-pontiac-olds-th400/7105261348.html

 

Thick or not,they still break like the rest. I broke one on the dyno. From the pan rail up an over to the other side. Broke another one on the inside.

 

Aren't the long tails technically TH 375's?

 

No, a 375 basically is a 400 inside but a 350 outputshaft.........

 

Appearing in the late 60's the "HD BOP case" TH 400's were first used in full size car builds. Most were long tails, but there were some short tail transmissions out there.

This case resists bellhousing cracking very well, but the case is otherwise unchanged from the standard "thin bellhousing" cases.

If available, I try and use one in all my Level 2 builds.

Interestingly enough, the HP units out there in the GM muscle cars, all had the think bellhousing.

It was more of a weight thing, than a power thing, with the factory builds.

JW