4X4 Transfer Cases & Gear Charts

Gear Chart For 1 To 1 Lower Gear Set - Click To View

UPPER SETS

GEAR

TOOTH

YOUR TRANSFER

RATIO

COUNT

CASE RATIO IS

1 TO 1

32/32

1 TO 1

1 TO 1

1.032

31/32

1.032

1.032 over

1.065

31/33

1.065

1.065 over

1.100

30/33

1.100

1.100 over

1.133

30/34

1.133

1.133 over

1.172

29/34

1.172

1.172 over

1.207

29/35

1.207

1.207 over

1.250

28/35

1.250

1.250 over

1.286

28/36

1.286

1.286 over

1.333

27/36

1.333

1.333 over

1.370

27/37

1.370

1.370 over

1.420

26/37

1.420

1.420 over

1.462

26/38

1.462

1.520

25/38

1.520

1.560

25/39

1.560

1.625

24/39

1.625

1.667

24/40

1.667

UNDERDRIVE

OVERDRIVE

LOWER SETS

RATIO

TOOTH COUNT

RATIO

TOOTH COUNT

1 TO 1

33/33

2.421

19/46

1.640

25/41

2.824

17/48

Upper Set x Lower Set x Rear Ends ( x Any Transmission Ratio) = Overall Ratio

Gear Chart For 1.64 Lower Gear Set - Click To View

UPPER SETS

GEAR

TOOTH

WITHOUT REARS

RATIO

COUNT

YOUR O.A. RATIO IS

1 TO 1

32/32

1.640

1.640

1.032

31/32

1.692

1.589

1.065

31/33

1.747

1.540

1.100

30/33

1.804

1.491

1.133

30/34

1.858

1.447

1.172

29/34

1.922

1.399

1.207

29/35

1.979

1.359

1.250

28/35

2.050

1.312

1.286

28/36

2.109

1.275

1.333

27/36

2.186

1.370

27/37

2.247

1.420

26/37

2.329

1.462

26/38

2.398

1.520

25/38

2.493

1.560

25/39

2.558

1.625

24/39

2.665

1.667

24/40

2.734

UNDERDRIVE

OVERDRIVE

LOWER SETS

RATIO

TOOTH COUNT

RATIO

TOOTH COUNT

1 TO 1

33/33

2.421

19/46

1.640

25/41

2.824

17/48

Upper Set x Lower Set x Rear Ends ( x Any Transmission Ratio) = Overall Ratio

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gear Chart For 2.421 Lower Gear Set - Click To View

UPPER SETS

GEAR

TOOTH

YOUR TRANSFER

RATIO

COUNT

CASE RATIO IS

1 TO 1

32/32

2.42

2.42

1.032

31/32

2.50

2.35

1.065

31/33

2.58

2.27

1.100

30/33

2.66

2.20

1.133

30/34

2.74

2.14

1.172

29/34

2.84

2.07

1.207

29/35

2.92

2.01

1.250

28/35

3.03

1.94

1.286

28/36

3.11

1.88

1.333

27/36

3.23

1.82

1.370

27/37

3.32

1.77

1.420

26/37

3.44

1.70

1.462

26/38

3.54

1.520

25/38

3.68

1.560

25/39

3.78

1.625

24/39

3.93

1.667

24/40

4.04

UNDERDRIVE

OVERDRIVE

LOWER SETS

RATIO

TOOTH COUNT

RATIO

TOOTH COUNT

1 TO 1

33/33

2.421

19/46

1.640

25/41

2.824

17/48

Upper Set x Lower Set x Rear Ends ( x Any Transmission Ratio) = Overall Ratio

Gear Chart For 2.824 Lower Gear Set - Click To View

UPPER SETS

GEAR

TOOTH

WITH-OUT REARS

RATIO

COUNT

YOUR TRANSFER RATIO IS

1 TO 1

32/32

2.824

1.032

31/32

2.91

2.74

1.065

31/33

3.01

2.65

1.100

30/33

3.11

2.57

1.133

30/34

3.20

2.49

1.172

29/34

3.31

2.41

1.207

29/35

3.41

2.34

1.250

28/35

3.53

2.26

1.286

28/36

3.63

2.20

1.333

27/36

3.76

2.12

1.370

27/37

3.87

2.06

1.420

26/37

4.01

1.99

1.462

26/38

4.13

1.520

25/38

4.29

1.560

25/39

4.41

1.625

24/39

4.59

1.667

24/40

4.71

UNDERDRIVE

OVERDRIVE

LOWER SETS

RATIO

TOOTH COUNT

RATIO

TOOTH COUNT

1 TO 1

33/33

2.421

19/46

1.640

25/41

2.824

17/48

Upper Set x Lower Set x Rear Ends ( x Any Transmission Ratio) = Overall Ratio

COMPLETE LINE OF THE MOST INDESTRUCTIBLE 4X4 TRANSFER CASES ON THE MARKET

12.66 CL DROP
QUICK CHANGE GEARING
GEARS FROM 1.3 OVERDRIVE to 4.7 UNDERDRIVE
1 3/4-10 SPLINE IN AND OUT
NO GEARING OR SHAFT FAILURE 15 YEARS
Click the links below to view images, parts drawings, dimensions, and exploded views.
12.66 CL DROP
COUNTER ROTATING
EASY SHIFT FROM TWO TO FOUR WHEEL
DRIVE W/INDICATOR SWITCH
QUICK CHANGE GEARING
GEARS FROM 1.3 OVERDRIVE to 4.7 UNDERDRIVE
1 3/4-10 SPLINE IN AND OUT
Click the links below to view images, parts drawings, dimensions, and exploded views.
18” CL DROP COUNTER ROTATION FOR REAR ENGINE TRUCKS
AVAILABLE WITH OR WITHOUT NEUTRAL QUICK CHANGE GEARING
GEARS FROM 1.3 OVERDRIVE to 4.7 UNDERDRIVE
1 3/4-10 SPLINE IN AND OUT
1 3/4-10 SPLINE COMPANION FLANGES ARE AVAILABLE FOR 1350/1410 or 1480/1550 JOINTS
Click the links below to view images, parts drawings, dimensions, and exploded views.
23.33″ CL DROP
QUICK CHANGE GEARING
GEARS FROM 1.3 OVERDRIVE to 4.7 UNDERDRIVE
1 3/4-10 SPLINE IN AND OUT
NO GEARING OR SHAFT FAILURE 15 YEARS
Click the links below to view images, parts drawings, dimensions, and exploded views.

When you are in need of high performance 4×4 parts, we have you covered.

What sets SCS Gearbox apart from other performance parts manufacturers? A combination of experience, dedication and a proven track record is just the beginning. Since 1979, we have been perfecting the manufacturing of our parts.

If you have questions about a specific product, how to order or have a general inquiry, we welcome you to give us a call at 419-483-7278. You can also reach our sales team via email at sales@scsgearbox.com. In the meantime, continue browsing through the rest of our website for more of our products and company information.