Wanna know how to find out what the gear ratio in your classic car or truck's rear end is. Or any vehicle for that matter that has a differential. This will work for front differentials as well.

This is actually two tests in 1. The first part will let you know if you have a open, or limited-slip differential. The 2nd part, will tell you your gear ratio.

This test is easy, only takes about 10 minutes, you don't have to take anything apart, and best of all its free! Costs you no money.

Want to know if your hot rod has a 4.10, 3.73, or a highway 2.56 ring and pinion gear? This is how you do it. Im going to demonstrate the test on my 1962 Pontiac Catalina Safari with its Oldmobile-Pontiac 9.3 rear axle.

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Video Section Information
00:00 Introduction
00:26 Open or Limited Slip Test
01:24 IMPORTANT! Test Differences & Instructions
02:38 Background on the Car
03:40 The Test, and Results Explained
04:30 Outro



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