Dual Range Auxiliary Transmission Gear Ratio Chart

U.S. Gear Corporation, 9420 Stony Island Ave., Chicago, IL 60617 -- Phone 888-874-3275

Dual Range Auxiliary Transmission Gear Ratio Chart

Use the instructions below to calculate Dual Range gear ratios
or click on your desired application.

GM T350 3 Speed Automatic Underdrive T350 3 Speed Automatic Overdrive T400/475 3 Speed Automatic Underdrive T400/475 3 Speed Automatic Overdrive T700R4 4 Speed Automatic Underdrive T4L80E 4 Speed Automatic Underdrive T4L80E 4 Speed Automatic Overdrive SM465 4 Speed Manual Underdrive SM465 4 Speed Manual Overdrive	Ford C6/C6B 3 Speed Automatic Underdrive C6/C6B 3 Speed Automatic Overdrive E40D/4R100 4 Speed Automatic Underdrive E40D/4R100 4 Speed Automatic Overdrive ZF 5 Speed (Gas) Manual Underdrive ZF 5 Speed (Diesel) Manual Underdrive ZF 6-Speed Underdrive ZF 6-Speed Overdrive T19 4 Speed Manual Underdrive T19 4 Speed Manual Overdrive
Dodge/Chrysler 518 4 Speed Automatic Underdrive 518 4 Speed Automatic Overdrive NV4500 5 Speed Manual Underdrive NV4500 5 Speed Manual Overdrive NV5600 6 Speed Manual Underdrive NV5600 6 Speed Manual Overdrive

Ratios	Typical Automatic Transmission		Typical Manual Transmission		Dual Range Auxiliary Transmission
	1st Gear	2.48:1	1st Gear	6.56:1	Underdrive	1.25:1
	2nd Gear	1.48:1	2nd Gear	3.58:1	Overdrive	0.80:1
	3rd Gear	1.00:1	3rd Gear	1.70.1
			4th Gear	1.00:1

How to Calculate

Drive Ratio = Primary Trans. Ratio x Vehicle Differential (Ring & Pinion) Ratio x Dual Range Ratio

Example:
Vehicle equipped with a 4.10 differential AND Dual Range Overdrive Transmission would have the following final drive ratio in Overdrive:

Final Drive Ratio = 1.00 (3rd Gear) x 4.10 (differential) x 0.80 (Dual Range)
= 3.28

Common Automatic Transmission Ratios
Make	Transmission	1st Gear	2nd Gear	3rd Gear	O/D
Ford	C6	2.46	1.46	1.00	N/A
	E40D	2.71	1.54	1.00	0.71
GM	T350	2.52	1.52	1.00	N/A
	T400/475B	2.48	1.48	1.00	N/A
	T700R4	3.06	1.63	1.00	0.70
	T4L80E	2.48	1.48	1.00	0.75

Common Manual Transmission Ratios
Make	Transmission	1st Gear	2nd Gear	3rd Gear	4th Gear	O/D
Ford	T18/19 (diesel)	4.02	2.41	1.41	1.00	N/A
	T18/19 (gas)	5.11	3.03	1.79	1.00	N/A
	ZF5 (diesel)	4.14	2.37	1.42	1.00	0.76
	ZF5 (gas)	5.72	2.94	1.26	1.00	0.76
GM	SM465	6.56	3.58	1.70	1.00	N/A
	NV4500	6.34	3.44	1.71	1.00	0.73

	T350 3 Speed Automatic Underdrive					T350 3 Speed Automatic Overdrive
Axle Ratio	3.08	3.42	3.73	4.10	Axle Ratio	3.08	3.42	3.73	4.10
Under	9.70	10.76	11.75	12.91	First	7.76	8.62	9.40	10.33
First	7.76	8.62	9.40	10.33	Over	6.20	6.89	7.52	8.26
Under	5.85	6.50	7.08	7.78	Second	4.68	5.20	5.67	6.23
Second	4.68	5.20	5.67	6.23	Over	3.74	4.16	4.53	4.98
Under	3.85	4.28	4.66	5.13	Third	3.08	3.42	3.73	4.10
Third	3.08	3.42	3.73	4.10	Over	2.46	2.73	2.98	3.27

	T400/475 3 Speed Automatic Underdrive					T400/475 3 Speed Automatic Overdrive
Axle Ratio	3.42	3.73	4.10	4.56	Axle Ratio	3.42	3.73	4.10	4.56
Under	10.60	11.56	12.71	14.14	First	8.48	9.25	10.17	11.31
First	8.48	9.25	10.17	11.31	Over	6.78	7.40	8.13	9.05
Under	6.33	6.90	7.58	8.44	Second	5.06	5.52	6.07	6.75
Second	5.06	5.52	6.07	6.75	Over	4.04	4.42	4.85	5.40
Under	4.28	4.66	5.13	5.70	Third	3.42	3.73	4.10	4.56
Third	3.42	3.73	4.10	4.56	Over	2.73	2.98	3.28	3.65

	T700R4 4 Speed Automatic Underdrive
Axle Ratio	3.42	3.73	4.10	4.56
Under	13.08	14.26	15.68	17.63
First	10.47	11.41	12.55	13.95
Under	6.96	7.60	8.35	9.28
Second	5.57	6.08	6.68	7.43
Under	4.28	4.66	5.13	5.70
Third	3.42	3.73	4.10	4.56
Under	2.98	3.26	3.58	3.98
Fourth	2.39	2.61	2.87	3.19

	T4L80E 4 Speed Automatic Underdrive					T4L80E 4 Speed Automatic Overdrive
Axle Ratio	3.42	3.73	4.10	4.56	Axle Ratio	3.42	3.73	4.10	4.56
Under	11.22	11.56	12.71	14.13	First	8.48	9.25	10.17	11.31
First	8.48	9.25	10.17	11.31	Over	6.78	7.40	8.14	9.05
Under	6.33	6.90	7.58	8.43	Second	5.06	5.52	6.07	6.75
Second	5.06	5.52	6.07	6.75	Over	4.05	4.42	4.86	5.40
Under	4.28	4.66	5.13	5.70	Third	3.42	3.73	4.10	4.56
Third	3.42	3.73	4.10	4.56	Over	2.74	2.98	3.28	3.65
Under	3.21	3.50	3.85	4.28	Fourth	2.57	2.80	3.08	3.42
Fourth	2.57	2.80	3.08	3.42	Over	2.06	2.24	2.46	2.74

	SM465 4 Speed Manual Underdrive					SM465 4 Speed Manual Overdrive
Axle Ratio	3.42	3.73	4.10	4.56	Axle Ratio	3.42	3.73	4.10	4.56
Under	28.00	30.54	33.58	37.34	First	22.40	24.43	26.86	29.87
First	22.40	24.43	26.86	29.87	Over	17.92	19.54	21.49	23.90
Under	15.30	16.69	18.35	20.40	Second	12.24	13.35	14.68	16.32
Second	12.24	13.35	14.68	16.32	Over	9.79	10.68	11.74	13.06
Under	7.26	7.93	8.71	9.69	Third	5.81	6.34	6.97	7.75
Third	5.81	6.34	6.97	7.75	Over	4.65	5.07	5.58	6.20
Under	4.28	4.66	5.13	5.70	Fourth	3.42	3.73	4.10	4.56
Fourth	3.42	3.73	4.10	4.56	Over	2.74	2.98	3.28	3.86

	C6/C6B 3 Speed Automatic Underdrive
Axle Ratio	3.55	3.73	4.10	4.56	4.88
Under	10.91	11.48	12.61	14.03	15.00
First	8.73	9.48	10.09	11.22	12.00
Under	6.48	6.81	7.49	8.33	8.90
Second	5.18	5.45	5.99	6.66	7.12
Under	4.44	4.66	5.13	5.70	6.10
Third	3.55	3.73	4.10	4.56	4.88

	C6/C6B 3 Speed Automatic Overdrive
Axle Ratio	3.55	3.73	4.10	4.56	4.88
First	8.73	9.18	10.09	11.22	12.00
Over	6.98	7.34	8.07	8.98	9.60
Second	5.18	5.45	5.99	6.66	7.12
Over	4.14	4.36	4.79	5.33	5.70
Third	3.55	3.73	4.10	4.56	4.88
Over	2.84	2.98	3.28	3.65	3.90

	E40D/4R100 4 Speed Automatic Underdrive							E40D/4R100 4 Speed Automatic Overdrive
Axle Ratio	3.55	3.73	4.10	4.63	4.88	5.13	5.38	Axle Ratio	3.55	3.73	4.10	4.63	4.88	5.13	5.38
Under	12.02	12.64	13.88	15.68	16.54	17.38	18.23	First	9.62	10.11	11.11	12.55	13.23	13.90	14.58
First	9.62	10.11	11.11	12.55	13.23	13.90	14.58	Over	7.69	8.09	8.88	10.04	10.58	11.12	11.66
Under	6.83	7.19	7.88	8.91	9.40	9.87	10.36	Second	5.47	5.75	6.31	7.13	7.52	7.90	8.29
Second	5.47	5.75	6.31	7.13	7.52	7.90	8.29	Over	4.38	4.60	5.04	5.70	6.02	6.32	6.63
Under	4.43	4.66	5.13	5.78	6.10	6.41	6.73	Third	3.55	3.73	4.10	4.63	4.88	5.13	5.38
Third	3.55	3.73	4.10	4.63	4.88	5.13	5.38	Over	2.84	2.98	3.28	3.70	3.90	4.10	4.30
Under	3.15	3.31	3.63	4.11	4.33	4.56	4.78	Fourth	2.52	2.65	2.91	3.29	3.46	3.64	3.82
Fourth	2.52	2.65	2.91	3.29	3.46	3.64	3.82	Over	2.01	2.12	2.32	2.63	2.77	2.91	3.06

ZF 5 Speed (Gas) Manual Underdrive					ZF 5 Speed (Diesel) Manual Underdrive
Axle Ratio	3.55	3.73	4.10	5.13	Axle Ratio	3.55	3.73	4.10	5.13
Under	25.38	26.67	29.31	36.67	Under	18.37	19.30	21.21	26.55
First	20.31	21.34	23.45	29.34	First	14.70	15.44	16.97	21.24
Under	13.05	13.71	15.06	18.85	Under	10.51	11.55	12.15	15.20
Second	10.44	10.97	12.05	15.08	Second	8.41	8.84	9.72	12.16
Under	7.15	7.51	8.25	10.32	Under	6.30	6.63	7.28	9.10
Third	5.72	6.01	6.60	8.26	Third	5.04	5.30	5.82	7.28
Under	4.43	4.66	5.13	6.41	Under	4.44	4.66	5.13	6.41
Fourth	3.55	3.73	4.10	5.13	Fourth	3.55	3.73	4.10	5.13
Under	3.38	3.53	3.90	4.88	Under	3.38	3.53	3.90	4.88
Fifth	2.70	2.83	3.12	3.9	Fifth	2.70	2.83	3.12	3.90

ZF 6-Speed Manual Underdrive				ZF 6-Speed Manual Overdrive
Axle Ratio	3.73	4.10	4.88	Axle Ratio	3.73	4.10	4.88
Under	26.99	29.67	35.31	Low	21.59	23.73	28.25
Low	21.59	23.73	28.25	Over	17.27	18.98	22.60
Under	15.43	16.96	20.19	First	12.34	13.57	16.15
First	12.34	13.57	16.15	Over	9.87	10.85	12.92
Under	9.79	10.76	12.81	Second	7.83	8.61	10.24
Second	7.83	8.61	10.24	Over	6.26	6.88	8.19
Under	6.10	6.71	7.98	Third	4.88	5.37	6.39
Third	4.88	5.37	6.39	Over	3.90	4.29	5.11
Under	4.66	5.12	6.10	Fourth	3.73	4.10	4.88
Fourth	3.73	4.10	4.88	Over	2.98	3.28	3.90
Under	3.35	3.69	4.39	Fifth	2.68	2.95	3.51
Fifth	2.68	2.95	3.51	Over	2.14	2.36	2.80
Under	24.38	26.80	31.90	Reverse	19.50	21.44	25.52
Reverse	19.50	21.44	25.52	Over	15.60	17.15	20.41

	T19 4 Speed Manual Underdrive			T19 4 Speed Manual Overdrive
Axle Ratio	3.55	3.73	4.10	Axle Ratio	3.55	3.73	4.10
Under	22.68	23.83	26.19	First	18.14	19.06	20.95
First	18.14	19.06	20.95	Over	14.51	15.25	16.76
Under	13.45	14.13	15.53	Second	10.76	11.30	12.42
Second	10.76	11.30	12.42	Over	8.61	9.04	9.94
Under	7.94	8.35	9.18	Third	6.35	6.68	7.34
Third	6.35	6.68	7.34	Over	5.08	5.34	5.87
Under	4.44	4.66	5.13	Fourth	3.55	3.73	4.10
Fourth	3.55	3.73	4.10	Over	2.84	2.98	3.28

518 4 Speed Automatic Underdrive			518 4 Speed Automatic Overdrive
Axle Ratio	3.55	4.10	Axle Ratio	3.55	4.10
Under	10.88	12.56	First	8.70	10.05
First	8.70	10.05	Over	6.96	8.05
Under	6.43	7.44	Second	5.14	5.95
Second	5.14	5.95	Over	4.11	4.76
Under	4.44	5.13	Third	3.55	4.10
Third	3.55	4.10	Over	2.84	3.28
Under	3.13	3.54	Fouth	2.50	2.83
Fourth	2.50	2.83	Over	2.00	2.26

NV4500 5 Speed Manual Underdrive			NV4500 5 Speed Manual Overdrive
Axle Ratio	3.55	4.10	Axle Ratio	3.55	4.10
Under	24.90	28.75	First	19.92	23.00
First	19.92	23.00	Over	15.94	18.40
Under	13.49	15.58	Second	10.79	12.46
Second	10.79	12.46	Over	8.63	9.96
Under	7.41	8.56	Third	5.93	6.85
Third	5.93	6.85	Over	4.74	5.48
Under	4.44	5.13	Fouth	3.55	4.10
Fourth	3.55	4.10	Over	2.84	3.28
Under	3.29	3.79	Fifth	2.63	3.03
Fifth	2.63	3.03	Over	2.10	2.42

Under	24.90	28.75	Reverse	19.92	23.00
Reverse	19.92	23.00	Over	15.94	18.40

NV5600 6 Speed Manual Underdrive			NV5600 6 Speed Manual Overdrive
Axle Ratio	3.54	4.10	Axle Ratio	3.54	4.10
Under	24.91	28.85	First	19.93	23.08
First	19.93	23.08	Over	15.94	18.46
Under	14.96	17.32	Second	11.97	13.86
Second	11.97	13.86	Over	9.58	11.09
Under	9.03	10.45	Third	7.22	8.36
Third	7.22	8.36	Over	5.78	6.69
Under	6.15	7.13	Fourth	4.92	5.70
Fourth	4.92	5.70	Over	3.94	4.56
Under	4.43	5.13	Fifth	3.54	4.10
Fifth	3.54	4.10	Over	2.83	3.28
Under	3.23	3.74	Sixth	2.58	2.99
Sixth	2.58	2.99	Over	2.06	2.39

Under	24.91	28.85	Reverse	19.93	23.08
Reverse	19.93	23.08	Over	15.94	18.46

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