While it may be possible to derive information about an auto’s gearbox ratio from its VIN, that depends largely on the information the manufacturer includes in
the vehicle descriptor section (VDS)
of the VIN.
How do I know what gear ratio My rear end is?
Count the number of teeth on the pinion gear and count the number of teeth on the ring gear.
Divide the ring gear teeth number by the number of teeth on the pinion
. The result is your gear ratio.
Can you tell gear ratio from VIN?
While it may be possible to derive information about an auto’s gearbox ratio from its VIN, that depends largely on the information the manufacturer includes in
the vehicle descriptor section (VDS)
of the VIN.
How do I find out what gear ratio My car has?
The large number is the ring-gear tooth count. To find the gear ratio,
divide the big number by the little number
. In the example to the left, 37 ÷ 12 = 3.083333. These are 3.08 gears.
How do I find my GM gear ratio?
Count the teeth on the small gear in the forward part of the axle housing, called the pinion gear. Count the number of the teeth in the big ring gear attached to the differential.
Divide the number of teeth on the pinion into the number of teeth on the ring gear
. This is the gear ratio.
How can I tell what gear ratio I have without pulling cover?
So an easy way to determine your actual gear ratio is
to check the tag attached to the differential cover by the cover bolts
. On the tag there should be some numbering such as 3.54 or 3.73, either of those numbers will give you the stock axle ratio.
Where is the gear ratio stamped?
If you are not sure about your results when using the wheel rotation method, the number of teeth is stamped on the ring gear. The small number is the pinion-gear tooth count. The large number is the ring-gear tooth count. To find the gear ratio,
divide the big number by the little number.
How do I tell what gear ratio my Chevy rear end has?
Identify your GMC or Chevrolet rear end gear ratio by
the RPO Codes
, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box.
How do you find the diameter of a gear ratio?
- gear ratio = (π * diameter of input gear)/(π * output gear)
- gear ratio = (diameter of input gear)/(diameter of output gear)
- gear ratio = (radius of input gear)/(radius of output gear)
How do you find the rpm of a gear ratio?
The general rule is – small to large gear means ‘
divide’ the velocity ratio(3:1) by the rpm of the first gear
. Divide 75 teeth by 25 teeth to find the velocity ratio. divide the 60rpm by the velocity ration (3). The answer is 20rpm.
How do I know if I have a limited slip differential?
The easiest way to tell if you have an open differential is to jack up the car and spin one of the rear tires. If the other wheel spins in the opposite direction, you have an open differential.
If it spins in the same direction
, you have a limited slip differential, or LSD.
How do I identify my GM differential?
Information about Differentials in GM vehicles can usually be obtained by looking at
the RPO or “Regular Production Option” codes contained in the Service Parts Identification tag in the glovebox
. Whenever possible, reference the tag numbers when ordering parts for your Differential.
What gear ratio is a GT4?
In stock configuration, the GT4’s 3rd gear is a somewhat lofty
1.41:1
, while the Sharkafied car receives a 1.65:1 ratio. This is probably the most important change internal to the gearbox.
How do I know what rear end my Jeep has?
Look at the inscription of the plug to find out the style of the rear end. In this example, Rich has a “Dana” style rear end. To determine if it is a 35 or 44 Dana,
look at the web area to the right of the plug
to locate the number.
How do you find the gear ratio on a Dodge Ram 2500?
Rotate the tire while counting the number of teeth in the large ring gear. Do the same for the small pinion gear in the front of the ring gear.
Divide the smaller number into the larger number
. This is the gear ratio.
