Designed for Pro4- Ultra4 & trophy trucks 4x4 , 28% under Driven. You can buy gears from Weismann to make it any ratio you would like.. These underdrive drives were built by Carl Renezener race team and they utilize all Weisman internals. This unit was only used twice and is like new perfect condition has internal pump. Just add your cooler super strong and compact and O-ring design case allows you to buzz the back cover off and change gear ratios easily. Ready to bolt on the back of your turbo 400 $8500 Located in Santee, California
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