The SKTFSC is A SHIFT KIT. What do you mean by "if full kit needed with this shift improver? I don't understand the question. If you want firmer, more aggressive shifts then use the Transgo TF-2 shift kit, instead if the SK TFSC kit. 25 cents worth of advise, unless you're a transmission builder and fully understand the hydraulics of the transmission, or have a builder assist you, just follow the instructions in the kits. I've seen my share of valve bodies where the instructions supplied where not followed, but bad advise from someone who wasn't a builder was, resulting in a valve body that headed for the scrap heap. JMHO I'm sure that Trail Beast and Rusty have seen this happen.