My kid has a 99 b3000.. it put out a p0500 code ,, so i replaced the vss sensor on the differential and the check engine and abs lights went out on the dash. . speedo still isnt coming on until about 20mph.. do i still have to clear the codes even thought the check engine and abs lights turned off? I read that there is another sensor on the tranny transfer case but I cant find it. If anyone has any suggestions it would be appreciated