If you call this company the tech servers will help you , have weight, rear gear, and your engine info handy. Most of the time they are confused with other elements of a torque converter or not measured properly. Unless you have 30" tall tires, and you're going down hill with your foot out of the throttle, there's no way you're turning 3000 RPM at 70 with a 3500 RPM converter and 3.73 gears. How to choose the stall speed of a converter? Your stock 10 bolt would probably not like getting hit with 450hp at 3000 rpms. mc5892 hyd 4 224 234 300 300 .465 .488 107 117 2000-5500 rough 817 comment: good mid torque. building stack 302 with e303 cam, 4r70w trans from a 98 mustang 3.8, car is a daily driver no track time ever, 4200lbs, 3.55 0r 3.73 rear end ,, expected fuel milage 20-25 mpg , should I use the factory torque converter or should I get one with a higher stall or use crane cam 2020/444211 which the techs at crane says don't need a higher stall thanks for any help.Forget … ! I have a cam close to the specs you are stating with a much lighter car then a truck and the converter I run (just an example) is a hole-shot 3400 made by B&M. Advertised cam durations over 272 degrees, will require a 3,000 to 3,600 stall converter for optimum performance.” In terms of torque and its effect on converter choice, as mentioned above, when the torque curve of the engine is raised, you need more stall speed in the converter to allow the vehicle to accelerate at lower RPM. I have a STOCK converter, 3.73 gears, and 28" tall tires and I run at 3400-3500 RPM at 70 depending on the grade of the road and the temprature of the transmission. biggest cam for use w/ stock converter. If you don't have the spec card, then you can probably get away with a 2,800-3,000 stall and be ok. Glad to help out, Good Luck!! With the cam you've listed, I'd reccomend a converter with a "flash stall" speed of 2,000 to 2,200 RPM. Stock torque converters generally have a stall speed around 1,800-2,000 rpm. mc1993 hyd 4 230 230 287 287 .480 .480 106 110 2000-5000 rough 817 comment: good for street rods with high stall converter The stall converter not only has to match your cam, but also your rear gears. That's the speed the engine will achieve when the brakes are locked down and the throttle is nailed to the floor quickly. 2200 + stall converter. I was supposed to convert my son's car to a T5 after rebuilding his engine with an E303, but he has changed his mind, and wants to keep the auto and the lockup function of the converter. Running a 306 with E303 cam and 4.10 gears, what stall converter should I use to keep it happy on the street? By the end of the series, hopefully you will be a stall speed and torque converter guru! You have a torque converter instead. The cam spec card tells you which stall speed converter you should use. A high stall converter also puts a lot more stress on your rear end u joints since you are launching at a higher rpm. So you need to have a converter that is set up to stall at an even higher RPM to match the engine’s new powerband with the new cam.” Cubic Inches of Your Engine Miller says, “The bigger your engine is, the more torque it will typically make. Stall speed and stall speed selection are terms that are frequently misused and misunderstood when shopping for a torque converter. Higher stall speeds become necessary when horsepower and torque happen at … You can find all sort of descriptions and explanations, but your first interest is in what your stall does for your car. Converter stall speed needs mostly center on your camshaft, heads, compression, gearing, vehicle weight, vehicle use, and expectations. comment: good low to mid torque. High stalls like low rear gears (higher numerically).