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These heavier coil springs replace the stock governor coil springs to safely allow the engine to reach higher RPMs, so there is no momentum loss when shifting gears while towing up a hill. These are especially a useful upgrade for manual transmission trucks to reduce power lost between gears. They are perfect for those who tow heavy loads and want more responsive power.
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Any recommended parts for these on a 12v that is has all the stock parts but some are tuned up a little?
In order for a 4k spring set to work properly, we would recommend various things in the engine. Push rods, valve springs, balanced, etc. If you are mostly stock I would recommend a 3k kit. - AW