Crossover SUV Rear Axle Gear Ratios
Crossover transfer unit equipped vehicles are normally front wheel drive and have an optional 4WD package. Crossover transfer unit equipped vehicles are unique because the front final drive gear ratio is different from the rear axle gear ratio. This means that the propshaft rotates at a different speed than the front drive axles. Crossover transfer units are full-time 4WD/AWD systems which utilize a clutch mechanism in the Transfer Unit or the rear axle to connect the power flow from the transfer unit to the wheels. There is no 4WD Low on these types of transfer units. On crossover 4WD/AWD vehicles, the transfer unit ring gear and carrier is driven the same speed as the front axle shafts and overdrives the pinion gear and rear propshaft with the same gear ratio that the rear axle uses for gear reduction. This way the front and rear wheels rotate at the same speed regardless of transmission final drive gear ratio.
|
Transfer Unit Model |
Rear Axle Gear Ratio |
| Caravan, Town & Country, Pacifica | 3.41 |
|
Transfer Unit Model |
Rear Axle Gear Ratio |
| Ford Escape, Mercury Mariner | 2.93 |
| Ford Five-hundred, Freestyle, Mercury Montego (Haldex Axle) | ? |
|
Transfer Unit Model |
Rear Axle Gear Ratio |
| Steyr (All other GM Crossover SUV's) | 3.42 |
| MF1A (Pontiac Vibe) | 2.277 |
| NVG-900 (Chevrolet Equinox, Buick Terraza, and Pontiac Montana SV6) | 2.53 |
| Saturn VUE (Honda PTU) | 3.39 |
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