Quick Intro to BMW Gear Ratios

What is a BMW gear ratio? A modern day transmission consists of multiple gears, with different gear ratios, inside the gearbox and the primary purpose is to maximize the energy produced by the engine. If there was no transmission and the power being delivered to the crankshaft was directly connected to the driveshaft to spin the wheels, your maximum speed is only as great as what the engine can provide. However with multiple BMW gear ratio inside a transmission, the engine’s power can be harvested to allow greater top speed without the engine spinning faster, thus being efficient as well.

An S54 E46 M3 engine can produce a maximum of 8,000 RPM to the crankshaft. You can have no transmission and have a top speed of 60 mph at 8,000 RPM or you can add a transmission with different BMW gear ratio to go 155 mph, while still being at 8,000 RPM.

How Do BMW Gear Ratio Work?

You have 2 RC car tires. Tire A has a circumference of 1 inch. Tire B has a circumference of 2 inches. If you roll both tires equally on the ground starting at the same point, Tire A will need to roll two full rotations to cover the same distance as tire B. What does that mean? Tire A has to rotate faster. Take this concept over to gears and you have a gearbox with a 2:1 gear ratio.

Transmission gears have teeth on them to prevent slippage. A BMW gear ratio of 2:1 can have a gear with 60 teeth and 30 teeth. You can also calculate the gear ratio, such as one found in a differential, by dividing the two.

BMW Gear Ratio Table

Below is a compilation of BMW gear ratio found on BMW transmissions and also the final drive ratios on the differential. This is a work in progress and I will continue to spend hours manually scavenging through official BMW brochures to compile. Baseline guides are already out there, but mostly scattered all over the internet so I took the time to compile in one list and also adding new data points for the newer cars such as the 7-speed DCT transmission, etc. If you see any corrections, please comment below.

Differential final drive, separate from transmission gearing, ratios are also listed. A lot of people talk about changing their diff ratio e.g. upgrading to 3.91 or 4.10 on the Getrag 420G 6-speed transmission for E46 M3. Without getting into too much detail, the differential has significant impact on the overall gearing of the transmission and can improve drivability on the streets or track.

wdt_IDModelChassisTypeTransmissionIIIIIIIVVVIVIIReverseFinal DriveRedline
1E30M3CoupeManual 3.83 2.20 1.40 1.00 0.81-- 3.464.10:1 7,250
2E30M3 (EU)CoupeManual 3.72 2.40 1.77 1.26 1.00-- 4.233.25:1 7,250
3E30M3 Evo ICoupeManual 3.72 2.40 1.77 1.26 1.00-- 4.233.25:1 7,250
4E30M3 Evo IICoupeManual 3.72 2.40 1.77 1.26 1.00-- 4.233.15:1 7,250
5E30M3 Sport EvoCoupeManual 3.72 2.40 1.77 1.26 1.00-- 4.233.15:1 7,250
6E36318iSedanManual 4.23 2.52 1.66 1.22 1.00-- 4.043.45:1 6,300
7E36318isCoupeManual 4.23 2.52 1.66 1.22 1.00-- 4.043.45:1 6,300
8E36318ciConvertibleManual 4.23 2.52 1.66 1.22 1.00-- 4.043.45:1 6,300
9E36318tiCompactManual 4.23 2.52 1.66 1.22 1.00-- 4.043.45:1 6,300
10E36323iSedanManual 4.23 2.52 1.66 1.22 1.00-- 4.042.93:1 6,500
11E36323isCoupeManual 4.23 2.52 1.66 1.22 1.00-- 4.042.93:1 6,500
12E36323ciConvertibleManual 4.23 2.52 1.66 1.22 1.00-- 4.042.93:1 6,500
13E36325iSedanManual 4.23 2.52 1.66 1.22 1.00-- 4.043.15:1 6,500
14E36325isCoupeManual 4.23 2.52 1.66 1.22 1.00-- 4.043.15:1 6,500
15E36325ciConvertibleManual 4.23 2.52 1.66 1.22 1.00-- 4.043.15:1 6,500
16E36328iSedanManual 4.20 2.49 1.66 1.24 1.00-- 3.892.93:1 6,500
17E36328isCoupeManual 4.20 2.49 1.66 1.24 1.00-- 3.892.93:1 6,500
18E36328ciConvertibleManual 4.20 2.49 1.66 1.24 1.00-- 3.892.93:1 6,500
19E36M3 (1995)CoupeManual 4.20 2.49 1.66 1.24 1.00-- 3.893.15:1 6,500
20E36M3CoupeManual 4.20 2.49 1.66 1.24 1.00-- 3.893.23:1 6,500
21E36M3SedanManual 4.20 2.49 1.66 1.24 1.00-- 3.893.23:1 6,500
22E36M3ConvertibleManual 4.20 2.49 1.66 1.24 1.00-- 3.893.23:1 6,500
23E36318iSedanAuto 2.86 1.62 1.00 0.72--- 2.004.44:1 6,300
24E36318isCoupeAuto 2.86 1.62 1.00 0.72--- 2.004.44:1 6,300
25E36318ciConvertibleAuto 2.86 1.62 1.00 0.72--- 2.004.44:1 6,300
26E36318tiCompactAuto 2.86 1.62 1.00 0.72--- 2.004.44:1 6,300
27E36323iSedanAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
28E36323isCoupeAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
29E36323ciConvertibleAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
30E36325iSedanAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
31E36325isCoupeAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
32E36325ciConvertibleAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
33E36328iSedanAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
34E36328isCoupeAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
35E36328ciConvertibleAuto 2.86 1.62 1.00 0.72--- 2.003.91:1 6,500
36E36M3CoupeAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.38:1 6,500
37E36M3SedanAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.38:1 6,500
38E36M3ConvertibleAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.38:1 6,500
39E46323iSedanManual 4.23 2.52 1.66 1.22 1.00-- 4.043.07:1 6,500
40E46323ciCoupeManual 4.23 2.52 1.66 1.22 1.00-- 4.043.07:1 6,500
41E46323cicConvertibleManual 4.23 2.52 1.66 1.22 1.00-- 4.043.46:1 6,500
42E46323iTWagonManual 4.23 2.52 1.66 1.22 1.00-- 4.043.46:1 6,500
43E46328iSedanManual 4.21 2.49 1.66 1.24 1.00-- 3.852.93:1 6,500
44E46328ciCoupeManual 4.21 2.49 1.66 1.24 1.00-- 3.852.93:1 6,500
45E46325iSedanManual 4.23 2.52 1.66 1.22 1.00-- 4.043.15:1 6,500
46E46325ciCoupeManual 4.23 2.52 1.66 1.22 1.00-- 4.043.15:1 6,500
47E46325cicConvertibleManual 4.23 2.52 1.66 1.22 1.00-- 4.043.46:1 6,500
48E46325iTWagonManual 4.23 2.52 1.66 1.22 1.00-- 4.043.46:1 6,500
49E46325xiSedan AWDManual 4.21 2.49 1.66 1.24 1.00-- 3.853.23:1 6,500
50E46325xiTWagon AWDManual 4.21 2.49 1.66 1.24 1.00-- 3.853.23:1 6,500
51E46330iSedanManual 4.21 2.49 1.66 1.24 1.00-- 3.852.93:1 6,500
52E46330ciCoupeManual 4.21 2.49 1.66 1.24 1.00-- 3.852.93:1 6,500
53E46330cicConvertibleManual 4.21 2.49 1.66 1.24 1.00-- 3.853.07:1 6,500
54E46330xiSedan AWDManual 4.21 2.49 1.66 1.24 1.00-- 3.853.07:1 6,500
55E46330iSedanManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.932.93:1 6,500
56E46330ciCoupeManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.932.93:1 6,500
57E46330cicConvertibleManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.07:1 6,500
58E46330xiSedan AWDManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.07:1 6,500
59E46330i ZHPSedanManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.07:1 6,800
60E46330ci ZHPCoupeManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.07:1 6,800
61E46330cic ZHPConvertibleManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.07:1 6,800
62E46M3CoupeManual 4.23 2.53 1.67 1.23 1.00 0.83- 3.753.62:1 8,000
63E46M3ConvertibleManual 4.23 2.53 1.67 1.23 1.00 0.83- 3.753.62:1 8,000
64E46M3CoupeAuto (SMG II) 4.23 2.53 1.67 1.23 1.00 0.83- 3.753.62:1 8,000
65E46M3ConvertibleAuto (SMG II) 4.23 2.53 1.67 1.23 1.00 0.83- 3.753.62:1 8,000
66E46323iSedanAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
67E46323ciCoupeAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
68E46323cicConvertibleAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
69E46323iTWagonAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
70E46328iSedanAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
71E46328ciCoupeAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
72E46325iSedanAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
73E46325ciCoupeAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
74E46325cicConvertibleAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
75E46325iTWagonAuto 3.67 2.00 1.41 1.00 0.74-- 4.103.46:1 6,500
76E46325xiSedan AWDAuto 3.45 2.21 1.59 1.00 0.76-- 3.173.46:1 6,500
77E46325xiTWagon AWDAuto 3.45 2.21 1.59 1.00 0.76-- 3.173.46:1 6,500
78E46330iSedanAuto 3.45 2.21 1.23 1.00 0.76-- 3.173.38:1 6,500
79E46330ciCoupeAuto 3.45 2.21 1.23 1.00 0.76-- 3.173.38:1 6,500
80E46330cicConvertibleAuto 3.45 2.21 1.23 1.00 0.76-- 3.173.38:1 6,500
81E46330xiSedan AWDAuto 3.42 2.22 1.60 1.00 0.75-- 3.033.46:1 6,500
82E46330i ZHPSedanAuto 3.45 2.21 1.23 1.00 0.76-- 3.173.64:1 6,800
83E46330ci ZHPCoupeAuto 3.45 2.21 1.23 1.00 0.76-- 3.173.64:1 6,800
84E46330cic ZHPConvertibleAuto 3.45 2.21 1.23 1.00 0.76-- 3.173.64:1 6,800
85E82128iCoupeManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.943.23:1 7,000
86E82135iCoupeManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.08:1 7,000
87E82128iCoupeAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.73:1 7,000
88E82135iCoupeAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.46:1 7,000
89E85Z4 2.5iRoadsterManual 4.23 2.52 1.66 1.22 1.00-- 4.043.46:1 6,500
90E85Z4 3.0iRoadsterManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.07:1 6,500
91E85Z4 3.0siRoadsterManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.23:1 7,000
92E85Z4 3.0i N52RoadsterManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.943.38:1 7,000
93E85Z4 M3.2RoadsterManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.62:1 8,000
94E85Z4 2.5iRoadsterManual 4.23 2.52 1.66 1.22 1.00-- 4.043.64:1 6,500
95E85Z4 3.0iRoadsterManual 4.23 2.52 1.66 1.22 1.00-- 4.043.46:1 6,500
96E85Z4 3.0siRoadsterManual 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.64:1 7,000
97E85Z4 3.0i N52RoadsterManual 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.73:1 7,000
98E86Z4 3.0siCoupeManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.46:1 7,000
99E86Z4 M3.2CoupeManual 4.35 2.50 1.66 1.23 1.00 0.85- 3.933.62:1 8,000
100E86Z4 3.0siCoupeAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.64:1 7,000
101E88128iConvertibleManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.943.23:1 7,000
102E88135iConvertibleManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.08:1 7,000
103E88128iConvertibleAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.73:1 7,000
104E88135iConvertibleAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.46:1 7,000
105E90325iSedanManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.943.23:1 7,000
106E90325ixDrive SedanManual 4.35 2.50 1.67 1.23 1.00 0.85- 3.933.38:1 7,000
107E90330iSedanManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.933.15:1 7,000
108E90330ixDrive SedanManual 4.35 2.50 1.67 1.23 1.00 0.85- 3.933.15:1 7,000
109E90328iSedanManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.943.23:1 7,000
110E90328ixDrive SedanManual 4.35 2.50 1.67 1.23 1.00 0.85- 3.933.38:1 7,000
111E90335iSedanManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.08:1 7,000
112E90335ixDrive SedanManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.08:1 7,000
113E90M3SedanManual 4.06 2.37 1.58 1.19 1.00 0.87- 3.683.85:1 8,300
114E90M3SedanAuto (DCT) 4.78 2.93 2.15 1.68 1.39 1.20 1.00 4.453.15:1 8,300
115E90325iSedanAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.73:1 7,000
116E90325ixDrive SedanAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.91:1 7,000
117E90330iSedanAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.64:1 7,000
118E90330ixDrive SedanAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.64:1 7,000
119E90328iSedanAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.73:1 7,000
120E90328ixDrive SedanAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.91:1 7,000
121E90335iSedanAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.46:1 7,000
122E90335ixDrive SedanAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.46:1 7,000
123E90335dSedanAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.402.81:1 7,000
124E91325ixDrive WagonManual 4.35 2.50 1.67 1.23 1.00 0.85- 3.933.38:1 7,000
125E91328iWagonManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.943.23:1 7,000
126E91328ixDrive WagonManual 4.35 2.50 1.67 1.23 1.00 0.85- 3.933.38:1 7,000
127E91325ixDrive WagonAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.91:1 7,000
128E91328iWagonAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.73:1 7,000
129E91328ixDrive WagonAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.91:1 7,000
130E92328iCoupeManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.943.23:1 7,000
131E92328ixDrive CoupeManual 4.35 2.50 1.67 1.23 1.00 0.85- 3.933.38:1 7,000
132E92335iCoupeManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.08:1 7,000
133E92335ixDrive CoupeManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.08:1 7,000
134E92M3CoupeManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.85:1 8,300
135E92M3CoupeAuto (DCT) 4.78 2.93 2.15 1.68 1.39 1.20 1.00 4.453.15:1 8,300
136E92328iCoupeAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.73:1 7,000
137E92328ixDrive CoupeAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.91:1 7,000
138E92335iCoupeAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.46:1 7,000
139E92335ixDrive CoupeAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.46:1 7,000
140E93328iConvertibleManual 4.32 2.46 1.66 1.23 1.00 0.85- 3.943.38:1 7,000
141E93335iConvertibleManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.08:1 7,000
142E93M3ConvertibleManual 4.06 2.40 1.58 1.19 1.00 0.87- 3.683.85:1 8,300
143E93M3ConvertibleAuto (DCT) 4.78 2.93 2.15 1.68 1.39 1.20 1.00 4.453.15:1 8,300
144E93328iConvertibleAuto 4.07 2.37 1.55 1.16 0.85 0.67- 3.203.91:1 7,000
145E93335iConvertibleAuto 4.17 2.34 1.52 1.14 0.87 0.69- 3.403.46:1 7,000

Should I Upgrade My Differential Final Drive?

A higher ratio final drive will provide more torque at the wheels and faster acceleration, but a lower top speed – and vice versa for lower final drive. The final drive itself is usually cheaper than the install. Installation requires you to drop your differential and open up the case so that’s where a lot of the money is spent. I would estimate around $2,200 for parts and labor for final drive swap on an E46 M3.

Is it worth it? I don’t think it’s worth it unless you feel like you maximized your potential on track. On track, the final drive is more about shifting and power band optimization more than it is for quicker acceleration. Another thing you can try before a final drive swap is to get shorter profile or smaller diameter tires. That allows a full rotation to happen faster on the car, so same principles as getting a shorter final drive. We list the differential/gearing upgrade for hardcore track enthusiasts in our Essential E46 M3 Track Day Mods.