I run a 3K stall, it flashes to about 3400...gears are 3.73's, and Im OK cruizin with it...on a long hiway trip it can get a little "tense", but I dont do many long trips with it. I run a trans cooler too, and no problems. Do NOT try to save money by buying a low price converter...buy the best you can afford, you will be very sorry if you dont...this is one of many areas where "you get what you pay for" John