It isn't realistic to think a 331 with 410 HP will propel a car like that to 150, or even 120 MPH on a drag strip, so let's say 110 MPH is a reasonable top speed for that car for either at the track or for running down the open back roads. If you can't launch and GET to your speed quickly, you won't run a good elapse time. 80% of the race is the first 80 feet! A Mustang usually has a pretty short tire diameter of like 25 inches, so we'll use 25" as our baseline. 6,400 RPM x 28" tall tires = 179200.

So 70 x let's try a gear set of 3.50's, x 336 = 82320. Input your stock and new tires sizes along with your original gear ratio. So here's the math equations again all by themselves.MPH x Axle Ratio x 336  -- Divide that number by the Tire DiameterRPM x Tire Diameter  -- Divide that number by the Axle Ratio x 336RPM x Tire Diameter -- divide that number by the MPH x 336For the best deals on your performance parts and accessories with the best service, choose where I order all of my components from... Competition Products!

This chart provides values that represent a 1:1 ratio on a manual transmission. The engine is literally only HALF of the battle. So let's first determine the base line numbers.

Now add the torque converter slippage of a couple of hundred RPM and you're up into the 6,300 RPM area which is just too high for an engine that noses-over in power at 5,700 RPM.

Designed to work with any winch models.This modular design gives your Jeep a custom look able to conquer any terrain. If you want your car to be "quick" and launch hard with a super quick 0 - 60 MPH time, you'll need low (short) gears.

That means there is a 420 RPM difference between 3.00 gears and 3.50 gears on that car.Let's say you already have an idea of how fast you want your car to be and at what RPM the engine peaks out at and you want to know what gear ratio to go with so the engine's RPM maxes out at the top speed you want to go. In retrospect though, you can't go fast down the road if you are in 1st, 2nd or 3rd gear. Rear Axle Ratio x MPH x Transmission output ratio x 336 / tire diameter. In other words, with a typical street car that has 400 - 450 HP you'll NEVER be able to get to 164 MPH in a quarter mile, let alone 1 full mile because most cars will float and lose control at that speed without suspension modifications, ground effects, etc, so that gear ratio is completely useless for drag or street racing, although it's a great ratio for running down the highway at a decent RPM for long distances.So let's take a look at running down the freeway using this same car set-up and numbers. Divide 179200 by 1092 and you get 164.10 MPH. You certainly can't do a wheelie in anything higher than 4th gear on a typical 10 speed bike because the gear ratio is just too tall, no matter how string your legs are. If you went with the 3.73's, at 110 MPH you'd be spinning 5,514 RPM, which you might think is a little low for what you want, BUT if you're running an automatic transmission with a stall converter of say 2,600 RPM it will have a little bit of slippage, even at that RPM, so figure on about another 200 - 300 RPM which would make that RPM more like 5,700 - 5,800 which is pretty much right on the money for where you want to be at.Just for giggles, if you chose to run the 4.10 gears, at 110 MPH you'd be spinning 6,061 RPM. Rear End Gear Ratio Needed :1: Speedmaster Tools. It also means you'll get your doors blown off in a street race from stop light to stop light.

The car is going to be used on the street and maybe some weekend drag racing just for some fun. Sure, LOTS of engines can rev way past where they nose-over, but it's completely counter productive to run it past that point. Enter the tire size diameter and the target vehicle speed in MPH.

Rugged Ridge's Tire Carrier maintains full mobility of the rear tailgate and eliminates the cumbersome two-stage opening process present in other designs for easy use.The receiver hitch kit from Rugged Ridge offers a sturdy attachment point for the rear of your Jeep which makes towing your toys a breeze.This aluminum alloy constructed wheel gives a sleek style to your JK Wrangler. A really tall set of gears would be something like 3.00's.Let me give you some examples: Firstly, always remember this, rear end gears are no different than the 5 sprockets you have on any given 10 speed bicycle.

If you have a slippy converter of say, 3,000 RPM, then you are definitely going to see 300 or so more RPM than what the math just gave you unless you have a lock-up converter OR you are running a manual transmission.

The Spartacus Bumper features a satin black powder-coated finish on a sturdy 11 gauge stamped steel construction. If you are only wanting to drive around town and do effortless burnouts, be "quick", and look great at the Wednesday night drags, then you'll want a set of gears that best suits that style of driving, which will be low gears.

Here at Alloy USA we have a made an easy to read chart to help you decide what is on the best gearing for your Jeep.

Optional rock rings and center caps can allow you to customize your wheels.The classic D-Window wheel is one of the most recognized wheels in the industry. Too many guys like to brag about how high their engine can rev, which just shows how much they DON'T know about cars, engines, and performance. Click on Calculate. It's a"low" gear ratio but it has a high number. You'll instead want something that'll get you better gas mileage and cruise down the highway at a decent RPM.


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