Mud & Sand Racing

Mud & Sand Racing

20 30 40 Gear Chart With Gear Ratio Calculator

FOR 20, 30. 40 SERIES

AND TWIN COUNTERSHAFT TRANSMISSIONS

RATIO

NO. TEETH

GEAR I.D. NO.

SET NO.

1 TO 1

25

51

90-0022

25

51

1.047

21

99

90-0018

22

100

1.083

24

97

90-0017

26

98

1.125 *

24

95

90-0016

27

96

1.150

20

93

90-0015

23

94

1.174 *

23

91

27

92

FINE TOOTH

1.192 *

26

89

31

90

1.217

23

87

90-0012

28

88

FINE TOOTH

1.231 *

26

85

32

86

1.263

19

83

90-0010

24

84

FINE TOOTH

1.280 *

25

81

32

82

1.300

20

264

90-0031

26

265

1.318

22

79

90-0008

29

80

1.350

20

266

90-0032

27

267

1.389

18

119

90-0023

25

120

1.421

19

133

90-0028

27

134

1.474

19

135

90-0029

28

136

1.529

17

123

90-0025

26

124

1.632

19

125

90-0026

31

126

1.777

18

127

90-0027

32

128

TO CALCULATE OVERALL GEAR RATIO
4 Wheel
SCS
Shiftable or
Rear Axle x Transfer x Head Set x Quick Change
Example: 6.20 x 2.00 x 1.389 x 1.389 = 23.92
2 Wheel SCS SCS
Planetary Head Set or Quick
Ratio x Rear End x Shiftable x Change
Example: 3.6 x 5.29 x 1.083 x 1.047 = 21.59
under under
NOTE: If any gear is in Overdrive
divide by Overdrive last
Example: 3.6 x 5.29 x 1.083 divided by 1.047 = 19.69
under over

SCS Gearbox: Manufacturer of Quick Change Transfer Cases, Countershaft Transmissions and More!

If you are into mud and sand racing and are seeking out a high performance quick change transfer case, countershaft transmission or gear chart, you have come to the right place. For more than 30 years, SCS Gearbox has been the leading manufacturer of these parts and a number of other mud and sand racing parts. To learn more about our racing parts and products, contact us today.

Feel confident knowing that here at SCS Gearbox, we possess the same level of competitiveness, dedication and drive that you do on the track or course. We realize that we aren’t successful unless you are which is why we are constantly looking for ways to improve the performance of our parts. For the best in quick change gearboxes, 3 speed transmissions and quick change transfer cases, look no further than SCS Gearbox!

Contact SCS Gearbox today for more information on our transfer cases, transmissions, gearboxes and other performance racing parts.

Thank you for visiting and for considering SCS Gearbox for your quick change transfer case, countershaft transmission and gear chart needs. Have questions about a specific product or how to order? Give us a call today at 419-483-7278 or send an email to sales@scsgearbox.com and one of our associates will be more than glad to assist you. Connect with us on Facebook, Twitter and Google+ for even more up to date news and information, promotions, customer testimonials and more.
We look forward to hearing from you!