There are four ways to find a ratio.
1 A dealer can normally tell from the vin number.
2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement
info.
3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.
4 You can divide the number of teeth on the ring gear and divide by number of teeth on the pinion.
The 72 Challenger had 3 different gear ratios depending on the motor the car came with. If the car came with the 225 or 318 cu. in. motor it had 2.76 or 3.23 gears in the rear end. If it was a Rallye Car with the 340 cu.in. motor it had the 3.23 or 3.55 gears. The approximate ratio can be determined by marking both the a wheel and the driveshaft; turn the wheel one complete turn and the number of times the driveshaft rotates is the ratio of gears in the rear end.
Differential gears don't measure anything. When you talk about "gear ratio", you are talking about the gears (ring and pinion), in the rear end. A 4.11 gear ratio for example, allow the engine to turn 4.11 times for every one revolution of the vehicle rear end. Other ratios could be 3.07, 3.50, 3.70 and etc.Differential gears on the other hand, are the gears in the differential case (located next to the ring gear), that allow a truck or car to turn a corner. They are a set of 4 gears that allow the axles to rotate independently in the rear end when turning. They also allow the axle to pull equally on the straight road.In common language, the term "Differential" is usually used in reference to the "Rear End", which is actually incorrect. IE "I have a 4.11 differential ratio in my truck".The proper statement would be "I have a 4.11 rear end ratio in my truck".
For a faster top speed, you'd want shorter rear end gears. For quicker acceleration, you'd want taller rear end gears.
Yes, they will affect your speedometer, unless you have it recalibrated (changing internal gears in mechanical models, or reprogramming for ECM controlled units). Same holds true for changing rear end ratios.
373
3.73
3.08
4.08
2.73 gears
The available ratios include 3.21:1, 3.55:1, 3.92:1, 4.10:1The available ratios include 3.21:1, 3.55:1, 3.92:1, 4.10:1
Same thing it does in any other vehicle. "Rear end", "rears", etc. is commonly used in reference to the rear end gear ratio. If a truck has, for example, 3.58 rear end gears, it means the driveshaft turns 3.58 times for every one turn of the rear end gear. The rear end gears are what makes the tires of the drive axle turn, thus propelling the vehicle.
you could get 2.92, 3.23, and 3.55, and 3.90 gears in the darts