4 To 1 TRANSFER CASE GEARING

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What's so great about a 4 to 1 Transfer case?

Why not just change my Ring & Pinion ratio?

STOCK JEEP With a 4 to 1
TRANSFER CASE

First Gear 3.93:1

Axle Ratio 3.07:1

Transfer case 4.00:1

Final Drive Ratio 48.26:1

With a R&P Change to 4.10:1 = 64.45:1

With a R&P Change to 4.56:1 = 71.68:1

TYPICAL VEHICLE WITH A STOCK TRANSFER CASE

First Gear 3.93:1

Axle Ratio 3.07:1

Transfer Case Ratio 2.72:1

Final Drive Ratio 32.82:1

With a R&P Change to 4.10:1 = 43.83:1

With a R&P Change to 4.56:1 = 48.74:1

Offroad Final Gear Ratios work best from 50:1 to 80:1, depending on tire size and engine size. For a smaller engine and a larger tire size, the HIGHER ratio (80:1) is desired. Just the opposite for a larger engine and smaller tires (50:1).

With automatic transmissions the need for lower reduction is often not as great as that of vehicles with manual transmissions because the torque converter almost doubles the torque output. But on down hill trails the lower range helps the automatic transmission Jeeps need much less braking.

4 To 1 L. L. C.
8925 South Capella Way
Sandy, UT 84093
801-641-1421
E-Mail: apfagen@sisna.com

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