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A higher number will give you higher revs (and consequently better acceleration). The drawback is that your engine will rev higher at cruising speed. So you're fuel economy will decrease, and your engine will be louder at a given speed. Additionally, your speedometer will be inaccurate if you change from your original gearing.
In the case of a differential with a gear ration of 3.69/1 ("3.69 to 1"), what the numbers are actually telling you is that the wheels will turn 3.69 revolutions for every 1 revolution that the driveshaft turns. So a differential with a "higher" number is said to be geared "lower".
Hope that helps.
Jeff Pierce
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Jeff Pierce
Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
Gravely 8120
Previous Vehicles:
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F
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