Four Wheeling Calculators

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This calculator will sort through all the Rancho RS5000 and RS9000 shocks and return the closest matches. Use this to maximize your articulation.

Calculate your ramp travel index with this handy calcualtor.
Just enter the wheelbase of your vehicle and the appropriate measurement and then press Compute.
You can use a ramp of any angle and the distance ALONG the ramp your vehicle achieves or...
You can use the height of your wheel when lifted by any other means (forklift, stairway, etc.).
Do yourself a favor and use the reset button...

These calculators provided by Mark Medina.

Now that you have your truck lifted, you want bigger meats. They look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. This calculator will get you back to a ratio that's closer to your original. Enter the values on the left and press Compute.

Ever wonder what your low-low-low gear ratio is, your "crawl ratio"? You'll need to do a little research by finding out the transfer case and transmission ratios first. Enter your values on the left side, press Compute and your answer will be on the right.

I've spend a bunch of time trying to WAG (wild ass guess) my actual MPH when going down the road. By knowing your gear ratios and tire size you'll get a more accurate idea here. Enter the value on the left, press Compute.

I suppose if you don't have a tachometer you could use this form, otherwise it's only useful to find out how accurate your Tach is. Enter the values on the left, press Compute.