Determining Rear Gear Ratio Without Removing Cover

[jasonmartinez]

good video man I feel like I understand this a lot more now compared to reading forums although it's so simple

[bgh]

Turning one side exactly 2 full turns is correct, but you MUST be sure that the other side DOES NOT MOVE AT ALL. If the other side moves, even just a little, it will throw everything off.

[guyriviere]

The easiest way is to chock the other wheel if you don't have an LSD, if you do have an LSD you don't need to. Mark the wheel and shaft in the same way, then turn the WHEEL not the shaft. Turn the wheel 10 times and count the shaft revolutions. For a 3.73 diff, with a none LSD the shaft will turn just over 18.5 times (18.65). Multiply by 2 which gives you 37.3. You have turned the wheel 10 times so you need to divide by 10 giving you 3.73. If it's an LSD axle then it will turn 37.3 times, so go straight to dividing by 10.

To determine whether or not you have an LSD (Limited Slip Differential) axle, simply jack up the vehicle so that both wheels are free to turn. Grab one wheel and turn it whilst watching the opposite wheel. If the other wheel turns the opposite direction it is not an LSD and you must chock one wheel before starting the test. if it turns in the same direction you've struck gold as it is and LSD. no need to chock the wheel.

Good luck
Guy

[CrzyMav]

It’s more accurate if the cover comes off and u count the ring and pinion gears

[wls]

trying to find what this rear differential came out of A10052270

[Ryanblake]

Are we sure its 2 revolutions? I swear its only 1...could be mistaken tho

[plainview]

So with this method mine went around 7.5 times. What rear end would that translate to?

[CrzyMav]

Then u divide the highest to lowest number and that’s your exact ratio...