I have a 1994 Chevy Suburban SE Wagon K2500, 8600 GVWR. 5.7L 350 TBI. (199.7 hp) and 262.3 ft lbs @ (4,000 rpm). (309.7 ft lbs) torque and 141.5 hp @ (2,400 rpm). Torque Converter Low Stall (1800 rpm). With 2 1/16" hub (snout) length. Cam shaft power band 0-3200 rpms. K&N FIPK cold air intake, 4L80E transmission w/overdrive and shift kit. NP241C transfer case. 4:88 gear ratio with Eaton electric lockers. 37X12.50X17 Toyo Open Country MT tires. Does anyone know what stall I can use to give me the most low-end torque. For off road use. I only drive on the road to get to the mountains or if snow is too deep for my daily driver. Boss Hog torque Converters suggested a 49481 converter which is a 1600-2200 stall. Does that sound right? If the stock stall is 1800 Rpm. Would I be able to notice any difference?
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Cam grind/profile along with vehicle weight final drive ratio and usage pattern determine ideal stall speed range. In your case, their recommendation makes sense and a stock stall should be fine.
The higher the stall speed, the greater amount of torque mutiplication occurs (and more performance potential) before the converter achieves total fluid coupling (fluid coupling = converter's stator one-way clutch is no longer holding but freewheeling). The engine speed in which that occurs is the stall speed.
Conversely, the higher the stall speed, the more heat is generated so you have to manage/mitigate that heat. Others have mentioned big trans coolers which is a must have, esp in a higher stall in a bigger, heavier vehicle.
Looks like you have an appropriate final drive (4.88) for your tire size so you can be a bit flexible in terms of your stall but i wouldnt go more than 2200 or so...for my street/off road/tow builds, i typically provide either a mild stall or a custom low stall for tow-centric builds, to keep heat in check.