I have a lenco st1200 behind a big block with an 871. The st1200 is the street box lenco came out with and it was made so you could down shift the trans on the street easier. It was designed to handle 1200 horsepower. Jeffco is another trans that was also designed to be downshifted easier for street use and it designed to handle 2500'horsepower. The down fall to the jeffco is there is a limited number of ratios to choose from. It definitely is alot of fun on the street. When downshifting you have to raise the rpm slowly for the trans to catch up to the motor like a high stall converter,if not you will break parts. When you shift it ,you know it, it hits pretty hard. Hopecthis helps some,good luck. Tig
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