When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
For an auto SC300 an upgraded torque converter is one of the best mods you can do beside going NA-T. It will dramatically increase your off the line acceleration. From what I have read an upgraded torque converter can make shifts slightly more harsh but nothing damaging.