Torque converter ?

[dangerdog]

How do you know if you have the correct stall rpm. And refresh my brain, dah the stall is when it locks up?

 

[Fastereddie]

Check out hughes website. They have a good article about stall speeds.
And from my personal experience, unless your building a street/strip vehicle stay with stock or near stock stall.

 

[Bent77]

Yes stall speed is when it locks. Your converter selection should be appropriate to the use.

So lets start with what you use it for and where does it lock up at?

 

[dangerdog]

B&m torque master 2000 stall th400 in a truggy with small block

 

[ChrisPerry]

I've got a 2100 rpm stall with a 400sbc, th350, np205, 5.13's, and 44's. Works great with the 2° advanced Crane 276 roller cam I'm running now. It sucked with the 268 lunati I used to run.

 

[79rustyk10]

Sm465 swap corrects all transmission issues.

 

[imiceman44]

Sm465 swap corrects all transmission issues.

If the sm465 is in good shape...

 

[Blue85]

I don't think you should be using the word "lock". For a torque converter, that generally means the clutch that turns the TC into a (near) solid coupling. Stall is the opposite, where maximum slip occurs.

Torque converter stall speed is the maximum amount of engine RPM that can be achieved in an automatic transmission-equipped vehicle while the transmission is in a forward operating range without generating any driveshaft motion.

Of course there are various definitions (brake, flash, static) and the amount seen varies by how big your engine is, etc, so talk to the TC supplier about your setup and desired use. Typically you want the stall to be a little under your peak torque RPM for racing, but this is kind of annoying for general street use.