Hot Rods 11 inch gm turbo 400 torque convertor

I believe most gm stock convertors are 12 inch diameters, and I have a 11 inch convertor. I am wondering if anyone has a stab on what the stall might be on the 11 inch units

 

400 converters are 13 inch. The 350 converters are 12 inch. There were smaller ones used with smaller engines, though.

It's pretty hard to tell what it would do, without knowing a part number or stock application. You can either try it, or get it taken apart and checked out and set up to do what you want.

 

I found a part number #20411

 

looks like an old B&M number, probably set up to get 2500 or so stall speed.

 

Jim you are just a fount of knowledge! I might add that stall speed is also affected by engine characteristics. At least that's what I was told when I asked that same question of a converter mfg. they wanted to know the HP of the engine.

Pat

 

HP and weight play a big roll in stall speeds. Same converter in five different cars will give five different results.

 

What color is the convertor ? Most B&M convertor were a dark blue almost purple.
I wouldn't run it without taking it to someone who builds or repairs convertors. If it is full of metal then you have just filled your transmission with metal and clutch material.
I would have it cut open and checked before I used it. I bought a turbo convertor once and found the sprag was broken. It sounded like it was full of gravel..

 

It is a blue, but not a dark blue. I bought the transmission and converter from a nice 55 chevy truck, that the guy went with a 4l60 transmission. I seen the truck running around, but he didn't know the stall, but it ran good. I am pretty sure it is in good condition. A buddy of mine bought the trans, but didn't want the stall on a mild 350 engine

 

You might be alright if it cam from a known good combo. Just give it a good flush and it sounds like a B&M number that you can look up . It could be one of their street convertors . They don't like trans brakes.

 

B&M street converter didn't like a 375 HP 396 either.

 

The issue I always had was coupling.. Once I was introduced to the world of custom converters that were built just for my car and engine I could never go back to "off the shelf" converters again.. The last one I bought was from a company called Continental converters. It was a 13" and built for my Pontiac 462, the cars 2.56 rear end and weight.. Wow what a difference. It was like adding 100 horses to my car..

 

Are you planning on using it and if so what are you putting it in ?
Weight of the vehicle, horsepower and gears all come into play on how it will react. My buddy had a 56 Chevy with a 427 and a 2500 converter, he moved up to a 3200 stall so I put the old 2500 in my lightweight t-bucket with a decently built 350. Damn thing acts like there's no stall at all in it, I hate it, if it wasn't such a pain in the ass to change it would be out of there.