The Detroit Tigers had the highest run differential by a team in 1984, with a differential of 186 runs.

	TEAM	DIFF	SEASON	G	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Tigers	186	1984	162	.642	104	58	5,644	829	1,529	254	46	187	788	602	34	941	106	68	6,373	2,436	487	48	45	51	102	.271	.342	.432	.774
2	Cubs	104	1984	161	.596	96	65	5,437	762	1,415	240	47	136	703	567	29	967	154	66	6,143	2,157	423	59	51	69	102	.260	.331	.397	.727
3	Yankees	79	1984	162	.537	87	75	5,661	758	1,560	275	32	130	725	534	38	673	62	38	6,356	2,289	437	64	59	41	147	.276	.339	.404	.743
4	Astros	63	1984	162	.494	80	82	5,548	693	1,465	222	67	79	640	494	17	837	105	61	6,201	2,058	368	87	55	57	88	.264	.323	.371	.694
5	Blue Jays	54	1984	163	.549	89	73	5,687	750	1,555	275	68	143	702	460	52	816	193	67	6,283	2,395	486	35	49	46	91	.273	.331	.421	.752
6	Padres	52	1984	162	.568	92	70	5,504	686	1,425	207	42	109	629	472	24	810	152	68	6,119	2,043	358	64	55	70	132	.259	.317	.371	.688
7	Pirates	48	1984	162	.463	75	87	5,537	615	1,412	237	33	98	586	438	19	841	96	62	6,119	2,009	368	81	44	47	131	.255	.310	.363	.672
8	Red Sox	46	1984	162	.531	86	76	5,648	810	1,598	259	45	181	767	500	20	842	38	25	6,250	2,490	485	36	46	48	148	.283	.341	.441	.782
9	Phillies	30	1984	162	.500	81	81	5,614	720	1,494	248	51	147	673	555	29	1,084	186	60	6,283	2,285	446	39	46	60	140	.266	.333	.407	.740
10	Orioles	14	1984	162	.525	85	77	5,456	681	1,374	234	23	160	647	620	22	884	51	36	6,186	2,134	417	45	43	48	133	.252	.328	.391	.719
11	Expos	8	1984	161	.484	78	83	5,439	593	1,367	242	36	96	553	470	25	782	131	38	6,042	1,969	374	74	34	50	101	.251	.312	.362	.674
12	Cardinals	7	1984	162	.519	84	78	5,433	652	1,369	225	44	75	610	516	23	924	220	71	6,086	1,907	344	68	46	49	120	.252	.317	.351	.668
13	Angels	-1	1984	162	.500	81	81	5,470	696	1,363	211	30	150	649	556	29	928	80	51	6,166	2,084	391	65	46	33	140	.249	.319	.381	.700
14	Twins	-2	1984	162	.500	81	81	5,562	673	1,473	259	33	114	636	437	24	735	39	30	6,107	2,140	406	26	58	45	138	.265	.318	.385	.703
15	Indians	-5	1984	163	.463	75	87	5,643	761	1,498	222	39	123	704	600	27	815	126	77	6,374	2,167	384	37	67	34	137	.265	.335	.384	.719
16	Royals	-13	1984	162	.519	84	78	5,543	673	1,487	269	52	117	639	400	24	832	106	64	6,063	2,211	438	41	55	39	128	.268	.317	.399	.716
17	Dodgers	-20	1984	162	.488	79	83	5,399	580	1,316	213	23	102	530	488	14	829	109	69	6,041	1,881	338	92	48	56	120	.244	.306	.348	.654
18	Braves	-23	1984	162	.494	80	82	5,422	632	1,338	234	27	111	578	555	20	896	140	85	6,106	1,959	372	64	45	70	113	.247	.317	.361	.678
19	Mets	-24	1984	162	.556	90	72	5,438	652	1,400	235	25	107	607	500	20	1,001	149	54	6,066	2,006	367	59	49	73	132	.257	.320	.369	.689
20	White Sox	-57	1984	162	.457	74	88	5,513	679	1,360	225	38	172	640	523	39	883	109	49	6,156	2,177	435	37	44	43	111	.247	.314	.395	.709
21	Athletics	-58	1984	162	.475	77	85	5,457	738	1,415	257	29	158	697	568	22	871	145	64	6,161	2,204	444	37	77	29	116	.259	.327	.404	.731
22	Rangers	-58	1984	161	.429	69	92	5,569	656	1,452	227	29	120	618	420	20	807	81	50	6,099	2,097	376	47	43	36	130	.261	.313	.377	.689
23	Mariners	-92	1984	162	.457	74	88	5,546	682	1,429	244	34	129	635	519	42	871	116	62	6,211	2,128	407	66	38	35	101	.258	.324	.384	.708
24	Brewers	-93	1984	161	.416	67	94	5,511	641	1,446	232	36	96	598	432	26	673	52	57	6,057	2,038	364	42	46	35	152	.262	.317	.370	.686
25	Reds	-120	1984	162	.432	70	92	5,498	627	1,342	238	30	106	578	566	12	978	160	63	6,200	1,958	374	71	53	62	99	.244	.313	.356	.669