gabe442

Iam getting a new th350 trans. but I don't know what stall to go with I drive my 1970 cutlass about five times a month I do go to the track once in awhile what should I go with? thanks

gearheads78

The converter needs to be matched to the rest of the combo. What is the rest of the setup?

gabe442

I don't know the guy who sold me the car said it's a chevy 350 with edelblock monifold and carb. comp cam he did not know the part number longtube headers the rear end is 12bolt with 3.73gears when i left the trans. shop today the guy said it feels like it has a big cam it the guy I bought the car from did't know much

rocketraider

What cam and intake are you running? What is their RPM powerband? What gearing? You want the converter to flash right as the cam hits its powerband, while allowing enough slippage to rev the engine into that rpm range with car at standstill.

As an example most Olds street cams start making power between 1800-2200 rpm, so you'd need a 2000 stall. More than that would hurt more than help. Now if you have a cam with a 2200-6500 PB, a 2500 stall will work well.

You also need to figure that stall is not an exact science and the same converter may flash at different speeds at different times.

rocketraider

God help . Do yourself a favor and pull the water pump and timing cover, and look on the end of the cam. Most cam grinders stamp their part number into it or some actually stamp the advertised duration into it.

Without knowing the cam specs it is impossible to figure the converter stall speed you need.

Not trying to down you because I know you didn't build this engine, but I have seen this way too many times. Somebody will throw an engine together without a plan, matching or documenting nothing, and then wonder why the car is a dog.

71 Cutlass

Gabe,
The first post by Gearhead is right on. So no GOOD answer can be given till then. I will say this generally speaking, 2500 stall for a street car that occaisionally sees the track. 3000 stall on the street slips a lot and could require aftermarket tranny cool in order to use that set up.

gabe442

thanks I am going to pull the water pump and the timing cover to get the part number so I know what the hell I got thank for the help