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# How do I know what ratio my diff is?

## How do I know what ratio my diff 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.

How wide is Jaguar rear end?

Original applications

Model Track
E-Type Series 1 & 2 50 in (1,270 mm)
E-Type Series 3 54 in (1,372 mm)
S-Type 54 in (1,372 mm)
420 54 in (1,372 mm)

What diff ratio is faster?

A lower (taller) gear ratio provides a higher top speed, and a higher (shorter) gear ratio provides faster acceleration. . Besides the gears in the transmission, there is also a gear in the rear differential.

### What does a 4.10 gear ratio mean?

Gear Ratio: the ratio of the ring and pinion gears in the rear axle. So, if you have a 4.10:1 (sometimes 4.10) rear axle, the pinion will turn 4.10 times for every single turn of the ring gear or in other words, for every 4.10 turns of the driveshaft, the rear wheel will spin once.

What is the best rear end gear ratio?

The most popular rear-end ratio in trucks today is the 3:55, which sort of averages towing power and fuel economy. This is a good ratio for the occasional towing or hauling individual. For a person who tows more often, and heavier loads, the 3:73 or 4:10 may be more appropriate.

How can I tell what gear ratio I have without pulling cover?

With the transmission in neutral, rotate the rear driveshaft by hand. Count the number of driveshaft revolutions required for one revolution of the tire. If the driveshaft turns approximately 3-1/2 times, you have a 3.54 ratio, etc.

#### What was the first American car with independent rear suspension?

the XKE
It’s hard to believe, but independent rear suspension has been with us for more than 45 years, as it was back in 1961 that Jaguar introduced the XKE, the first automobile to employ such a suspension design.

What rear end ratio should I use?

What is the best differential ratio?

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.

## Are 3.73 or 4.10 gears better?

4.10s are going to accelerate faster and decelerate faster on lift. However the trade off is greater fuel consumption per mile driven and higher engine speed per given road speed. In basic terms the 4.10s will feel quicker and 3.73 will feel faster.

What are 4/10 gears good for?

This equates to a greater amount of power transferred to the wheels. Installing 4.10 gears improves the car’s performance on the track but with negligible effects to the highway driving. If your car is equipped with an overdrive, you may not even notice a difference in gas mileage with the new higher gearing.

How to identify a JAG rear end?

Hey Cal, The width measurements are not an ideal way to ID a jag rear. The width changes drastically when they are removed from the vehicle and they are quite difficult to measure while in the car. A removed Jag IRS will be about an inch shorter, so allow your measurements to have a little wiggle room when you are identifying.

### What kind of suspension does a jaguar have?

Jaguar’s independent rear suspension (IRS) unit has been a common component of a number of Jaguar production cars since 1961, passing through two major changes of configuration up to 2006 and last used in the Jaguar XK8 and Aston Martin DB7.

What is the standard rear axle ratio?

The ratios were then compared as follows: Standard: Close ratio 1. 3.375 2.98 2. 1.982 1.74 3. 1.367 1.21 4. Direct Direct Rear axle ratios were variable, but usual were 3.64 and 3.54 I think (3.77 was initially said to be “standard” on OTS). You can jack up a rear wheel and start turning and counting to see what you have.

What is the diff ratio on a Mk 11?

The 3.54 was the ratio mostly used in overdrive MK 11s. Radials or crossplies? From memory, the standard diff in an early E Type was 3.07:1. The 3.54 was the ratio mostly used in overdrive MK 11s.