If you knew the weight that would help a little more, but my guess is it'd be right around 11.70s. Could be pushing the lower 11's but I think the 10" convertor will hold it back some and may actually help keep the rpm down a little as well. We ran a 28" tire and 4.56 gears for a little while on a stock stroke 360 with 8" convertor. It was spinning to 67-6800. We later put a 30" tire on it and dropped the rpm down to 62-6300.