Most gearheads reach for their toolbox when they need to work on their car, whether it’s changing out a carburetor, replacing the brakes, or just a general tune up. But there’s one tool that you can always carry with you, and it’s free from Tremec Transmissions. It may not help you change a carburetor, but it will help you get some answers about your vehicle.

The Tremec Mobile Toolbox App is a free download from Tremec that gives you tools that help you track down driveline vibrations, calculate your speed based on tire size and gear ratios, configure engine RPM, and even determine tire sizes.

The quick and easy way to determine if your driveline angle is correct.

The Driveline Angle Finder is perfect for finding out if your driveline angle is correct, or if you have an incorrect angle that could cause vibrations and driveline issues.

We’ve shared a video before that shows how the driveshaft angle can affect vehicle performance, and this tool at the top of the Toolbox App can help you determine if the pinion angle is off. The three-step process will give you the green light if everything checks out, or a warning if the u-joint working angles are incorrect.

The Vehicle Speed Calculator will help you determine your speed no matter what gear you’re in at any engine RPM. If you want to know how your vehicle speed will be affected by changing gear ratios or tire sizes, just enter the information to get the results and change the gear ratio or tire size to see the differences.

The RPM Calculator will help you determine what RPM your engine is turning when information is entered into the app. You can check this against your tachometer to see if it’s reading correctly, or to determine what your engine RPM is if you don’t have a tach.

Want to know what your tire diameter is? The app will calculate it for you.

The Tire Size Calculator is probably the one that you’ll use with your friends to help determine what tire sizes might work best for your car. Many gearheads want to put the largest tire they can on their car, and this app will convert the P-metric sizes to inches so you can tell just how big of a tire you can fit on your car. It makes sizing your tires easy, and is accurate to hundredths of an inch.

The Vehicle Speed Calculator and RPM Calculators are pre-loaded with popular transmissions from Tremec, Ford, GM, and Chrysler. These apps help you get the data you don’t know by entering the data you already know, and it’s available for iPhone and Android. Best of all, it’s a free download – and what gearhead doesn’t want free tools?

Download the free Tremec Mobile Toolbox App, you can only get it from Tremec Transmissions. Once you have it, reach for your mobile toolbox and show your friends that you’ve got the ultimate set of tools in the palm or your hand.