Not necessarily. The price tag on a lockup combo is huge, but the benefits are great. I know if I started without lockup I wouldn't be happy in the long run. Power level compared to gas, no you wouldn't need it. but with those converters in a diesel, the torque curve is so low, fast, violent, rpm range so short, it is tough to keep a converter super efficient. with no overdrive, gearing is already at its limits. if we had more rpm than a bb blower style converter would work great, but we don't. so getting the correct stall setup is tough without sacrificing. I think everyone looking at the level I want to be at has been down this road already as well
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