Yes the function of a stall convertor is to transfer engine torque at a higher speed. Most convertors in a stock vehicle stallout somewhere around 1500 rpm give or take. Since a convertor is also supposed multiply torque as well, most hi stall convetors will actually "flash" multiply torque through the innards for a second or so when the gas pedal is floored. This is very useful in cars with lazy rear gears like 3:55 and lower.

A great way to test your stock stall speed is to brake your truck hard, and floor the pedal (not the thing to do in your garage!) with the tranny in drive and OD off. If your brakes are up to snuff, your motor will stall against your brakes, and the rpm on your tach is a good indication of your convertors stall rpm. You may be suprised to know that "hi stall" convertors don't always stll at the advertised rpm, because gearing, tire size and vehicle weight are all factors. Like camshafts, a convertor that works with the chassis is a great addition, a poor choice may hurt performance. Lastly, going to lower gears starts to negate stall speed.

As stated, higher stall convertors 2800 rom and up create heat through internal slippage. My old Roadrunner would go from 180 degrees tranny temp to 220 degrees if I did a nice long smoky burnout. And that was with a huge tranny cooler too!

 

I agree, love that articulation shot with the rear on the stump. Like those rims

Convertor design plays a big role in low speed starts with higher stalls. My 2500 stall was a reworked stocker. It was very street friendly and would roll when releasing the brakes. Saw .05 off 60' times, and .2 off 1/4mile times which is a bit on the low side for a real tc. With cam it would stall just shy of 2800 though ran faster ets with 2200-2300rpms. 1-2nd shift improved as well. I suspect the MP hi stall tcs are the same way.

Most tc specialty shops that make real convertors (like the Viper) suggest keeping it at 2800 or lower for the street. My buddies na Ram has a Viper 4000rpm stall and he has mentioned it screwing him up once or twice but is usually ok. Upside, you gotta love a 1.75 short time for an Na Ram!

 

I am running 5:13 gears and 40" tires. I dont think that I will have that much of a problem of lack or power in the low end with it in 4lo. Anyways I will let ya'll know how it does when I get it in. Hopefully my tranny will be here monday the latest.