X0202 4 2006-10-06 0000075362 PACCAR INC PCAR 0001185321 ANDERSON DAVID C 777 106TH AVENUE NE BELLEVUE WA 98004 0 1 0 0 Vice President/General Counsel COMMON STOCK (SIP) 2006-10-06 4 J 0 .7 55.53 A 208.4 D STOCK OPTION 48.17 2008-01-01 2015-01-20 COMMON STOCK 5661 5661 D STOCK OPTION 48.34 2009-01-01 2016-01-26 COMMON STOCK 5784 5784 D September 5, 2006 dividend on PACCAR Savings Investment Plan (SIP) shares reinvested pursuant to SIP. (SIP information based on most recent report from SIP Trustee - received October 6, 2006.) On July 11, 2006 PACCAR declared a stock dividend of one additional share of common stock for every two shares of common stock payable August 10, 2006 to all holders of record of common stock on July 27, 2006. As a result of the stock dividend the reporting person received 69.2 additional shares of PACCAR common stock. Total also includes interest on funds held in SIP pending investment in shares reinvested in shares September 11 (0.006 shares) pursuant to SIP. Option to buy awarded under PACCAR Long Term Incentive Plan. Number of derivative securities, underlying securities and price adjusted to reflect 50% stock dividend. Fractional shares rounded to nearest 1/10. David C. Anderson 2006-10-09