Cubs finish tied for 3rd best OPS differential since 1914 & tied for best since 1939

They had an OPS of .772 and allowed .633. So that is a .139 differential. The .633 allowed is the lowest of any team since 1988 when the Mets had .620 and the Dodgers had .626. 

The Cubs actually edge out the 1998 Braves. It only looks like a tie at first glance due to rounding. Here are their numbers to more than 3 decimal places

Cubs Braves OBP 0.343397 0.341638 SLG 0.428675 0.452772 OPS 0.772073 0.79441 OBPA 0.285158 0.303487 SLGA 0.348276 0.353226 OPSA 0.633434 0.656712 Diff 0.138639 0.137698

Here are the leaders that I had previously compiled.

Team	Year	OPS	OPSA	DIFF
NYY	1927	0.872	0.676	0.196
NYY	1939	0.825	0.667	0.158
ATL	1998	0.795	0.656	0.139
BAL	1969	0.756	0.620	0.136
NYY	1936	0.864	0.733	0.131
STL	1944	0.745	0.615	0.130
STL	1942	0.717	0.590	0.127
CLE	1948	0.792	0.665	0.127
NYY	1998	0.825	0.699	0.126
SEA	2001	0.805	0.679	0.126
PHA	1929	0.816	0.692	0.124
NYY	1937	0.825	0.704	0.121
CLE	1995	0.839	0.718	0.121
BRO	1953	0.840	0.722	0.118
CLE	1954	0.744	0.626	0.118
NYY	1932	0.830	0.714	0.116
NYY	1931	0.840	0.726	0.114
PHA	1928	0.799	0.685	0.114
ATL	1997	0.769	0.655	0.114
STL	1943	0.725	0.611	0.114
NYY	1921	0.838	0.725	0.113
BRO	1941	0.752	0.641	0.111
LAD	1974	0.743	0.633	0.110
PHA	1931	0.789	0.680	0.109
BOS	2003	0.851	0.742	0.109