Vehicle transmission group Torotrak is providing a lift to the automobiles and parts sector, with shares climbing 17%.The firm revealed Wednesday that it has signed a licensing agreement totalling £8m with its largest shareholder, US-based peer Allison Transmission.Engineering giant GKN is among the best performers on the FTSE 100.The industrial transportation sector is the worst performing sector with aviation services provider BBA Aviation seeing shares fall.Shipping services specialist Clarkson is also edging lower.---bcTop performing sectors so far todayAutomobiles & Parts 4,776.67 +3.92%Technology Hardware & Equipment 767.78 +3.55%Household Goods & Home Construction 6,395.55 +2.73%Banks 4,889.53 +1.94%Food & Drug Retailers 4,751.90 +1.90%Bottom performing sectors so far todayIndustrial Transportation 2,541.20 -1.72%Forestry & Paper 6,317.40 -1.51%Industrial Engineering 6,791.80 -0.66%Alternative Energy null 0.00%Leisure Goods null 0.00%