# How do I know what gear ratio My rear end is?

## How do I know what gear ratio My rear end is?

Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it’s a 3.50:1 ratio. If it turned 4 and a quarter times, it’s a 4.25:1 ratio.

## Is 3.55 or 3.73 gears better?

A numerically higher axle ratio provides a mechanical advantage to send more of the engine’s available torque to the rear tires (and front tires, in a four-wheel drive vehicle), but you pay the price at the fuel pump. So, a truck with optional 3.73 gears will tow a heavier trailer than one with 3.55 or 3.21.

**How do I know what Toyota axle I have?**

You will also need to check the first few digits of you VIN #. The first position of the Axle Code is a letter which identifies the diameter of the ring gear. Toyota trucks and 4Runners have always used the 7.5″ and 8″ diameters, but the others are listed here for completeness.

**What is the difference between 3.73 and 4.10 axle ratio?**

That 3.73 vs. a 4.10 has a huge impact on engine rpm because you are selecting second gear with a 3.73 to pull the grade, but you can hit third gear with a 4.10. Your engine speed is about 1,000 rpm lower, so temperatures under hood are going to be significantly lower.

### How do I know what gear ratio My truck has?

To find the gear ratio, divide the big number by the little number. In the example to the left, 37 รท 12 = 3.083333. These are 3.08 gears. If you can’t find a stamping or it is unreadable.

### Is a 3.55 rear end good for towing?

It’s pure mechanics. BEST TOWING RATIO: In general, the best towing axle ratio for most of the post-2010 pickups is in 3.55 or 3.73. Those ratios provide very good acceleration with gas V-8s and diesels.

**What trucks have a 3.73 rear end?**

Now available from GM is a new 3.73 rear axle option for Silverado and Sierra half-ton pickup trucks, which will effectively increase towing capacities by 1000 lbs. for either truck in both 2WD and 4WD configurations.

**How do I know what rear differential I have?**

Without an ID tag, differentials are identified by the number of cover bolts, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter. They can also be identified by whether the center section is an integral or dropout design.

#### How can you tell if you have 3.73 gears?

Rotate the marked tire one revolution while counting how many times the driveshaft rotates. eg, If your driveshaft made 3 3/4 revolutions, that would determine a 3.73 gear ratio. If you get approximately 2 3/4 revolutions, you have a 2.76 gear ratio.

#### How do I find my diff ratio?

**What axle ratio do I have?**

Method 1: Count the number of teeth on the ring gear and the pinion. Divide the number of the ring gear’s teeth by the number of the pinion’s teeth. This will give you the axle ratio.

**What is the best gear ratio for a pickup truck?**

The higher the ratio, the more revolutions per minute. Towing: For pickup trucks released after 2010, the best axle ratio for towing falls somewhere between 3.55 and 3.73. This range provides good acceleration for V8 gas and diesel engines.

## How much weight can a 3.55 axle tow?

In 2WD models with the standard non-hybrid 3.5-liter EcoBoost, the F-150 Limited’s maximum tow rating is 11,300 pounds, and in 4WD models the maximum tow rating is 11,200 pounds with either the standard 3.31 axle ratio or optional 3.55 axle ratio.

## Is a 3.73 axle ratio good for towing?

FACT: A 3.73 axle ratio is ideal for towing heavy loads on flat terrain and will produce increased fuel economy during steady-state, long-distance highway driving.

**What is a 3.73 rear axle ratio?**

The number is expressed in a ratio, which represents the number of teeth on the ring gear divided by the number of teeth on the pinion. For example, a truck with a 3.73:1 gear ratio means that the driveshaft will turn 3.73 times for each complete wheel spin.

**What is the difference between 410 and 411 gears?**

4.10 will have 41/10 teeth so more, but smaller for the same diameter ring. 4.11 will have 37/9 teeth which will be larger. The 4.10 is a stronger pinion.

### What gear ratio is best for street racing?

If we have a daily driver, 2.55 to 3.25 gear ratios typically work best, whereas a street/strip application we would usually use a 3.42 to a 3.90 gear ratio, and race applications most commonly use a 4.10 and above gear ratios.