The Top Tigers positions players of all-time in terms of WAR are listed in Table 1. For example, Ty Cobb was 159.3 WAR lifetime which is the third best total in the history of the game. You can find the Top 500 in all of baseball at Baseball Projection. The top two were Babe Ruth (172.0) and Barry Bonds (171.4).
Before we go any further, keep in mind that WAR estimates become somewhat less reliable as we go back in time due the less detailed fielding data available. Smith uses his Total Zone fielding system to evaluate fielders for the retrosheet years starting in 1956 and Adjusted Range Factor prior to that. The most reliable data are for 2003 and forward. Data between 1956 and 2001 are a little less reliable and data prior to 1956 are the least accurate in terms of fielding contribution.