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.
Do front and rear axle ratios have to match?
As long as there’s less than a 1% difference between the ratios, they’re considered “close enough”. If your front axle only has 4.11 gears (37 ring gear teeth and 9 pinion teeth) but your rear axle has 4.09 gears (45 ring gear teeth and 11 pinion teeth) the ratios don’t match exactly.
What gear ratio is the best?
Good and Bad Gearing Ratios
- A gearing ratio higher than 50% is typically considered highly levered or geared.
- A gearing ratio lower than 25% is typically considered low-risk by both investors and lenders.
- A gearing ratio between 25% and 50% is typically considered optimal or normal for well-established companies.
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. This is known as the final drive, differential gear, Crown Wheel Pinion (CWP) or ring and pinion.
What is the difference between 3.21 and 3.92 axle ratio?
From the speed 31-38 MPH, 3.21 has higher final drive ratio over 3.92 (15.12 vs 12.31) until it has to shift to 2nd gear at 38MPH. From the speed 39-47 MPH, 3.92 has higher final drive ratio over 3.21 (12.31 vs 10.10) until it has to shift to 3rd gear at 47 MPH.
What rear end ratio should I use?
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 gears good for 35 tires?
You will be fine. Just gonna lose mpg and slow your truck down. I have run 35s with 3.73s and no issues at all. In fact, my recent Plat had a 4-inch lift, heavy 34.5 inch Nitto Trails, and 3.55 gears, and ran great!
How do you find the rpm of a gear ratio?
The general rule is – large to small gear means ‘multiply’ the velocity ratio by the rpm of the first gear. Divide 60 teeth by 30 teeth to find the velocity ratio. Multiply this number (2) by the rpm (120). This gives an answer of 240rpm.
Is a 3.92 gear ratio good?
4) 3.92 has 3 unique lower gears for towing. 5) Speed range that 3.21 is better at towing: 31-38 MPH, 48-57 MPH. 6) Speed range that 3.92 is better at towing: 0-30 MPH, 39-47MPH, 58-70 MPH.
Are 3.21 gears good?
In fact, the 3.92 1st gear is so low,you’ll be well into 3rd before you hit 60. The 3.21 hits 60 right after shifting into 3rd. – towing: for trailers at or under 8k, the 3.21 is fine. Yes it will operate one one gear lower pretty much the whole time, and be a little slower from a stop, but easily plenty of power.
Can you run 35s on 373 gears?
You can do it but it’s definitely not ideal. The ratios with a 5.13 first on a 3.73 rear end and 35’s (your proposed setup) is very slightly taller than what a stock 6MT Tacoma is in first gear so it’s not like you’re going to be causing massive wear getting started.