iPhone Screenshots


The TREMEC Toolbox will help you simplify driveline setup, predict the effects of changing gear ratios and tire size, and calculate vehicle speed and RPM variables. This Toolbox is great for planning your rig, allowing you to see what kind of performance to expect from different combinations!

The TREMEC Toolbox contains:

• Driveline Angle Finder: Take the guesswork out of your chassis setup with this handy 3-step tool! By using your smartphone as a measuring device, the app will calculate each u-joint angle and provide an overall driveline operating angle with a Pass/Fail response. Designed for RWD vehicles equipped with a one-piece driveshaft.

• Vehicle Speed Calculator: Interactively determine your vehicle’s speed in any gear and any engine RPM for best performance. You can alter the axle gear ratio, the transmission gear ratio and tire size to see the impact in real-time.

• RPM Calculator: Determine what RPM your engine will run based on gear ratio, tire size, transmission and MPH. Try various combinations to come up with the best combination of gear ratio and tire size for your vehicle.

• Tire Size Calculator: Convert the funky P-Metric tire size (Example: 265/75R16) on the side of your tires to inches to simplify these drivetrain calculators!

What’s New

Version 2.0

New transmissions, better adaptation to screen sizes, and various bug fixes.

Ratings and Reviews

2.9 out of 5
17 Ratings

17 Ratings

CaptWargamer ,

Great but

Great app from TREMEC but needs a few more manual transmissions added to the library. Also, please add a “saved transmission” option. Otherwise we have to re input all the custom ratios all over again. 2 simple fixes!! Thanks guys.

68customtruck ,

Originally worked

My original version worked great but somewhere the angle calculator stopped. Great program until that.

Lee Fogel ,

Works terrific

Nice and useful app. I can see Trenec expand this as it's simple but handy stuff to have at your fingertips.

App Privacy

The developer, Michael Kvicala, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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