How to find the ratio for my rearend - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
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post #1 of 6 Old 07-08-2019, 05:13 AM Thread Starter
TheNerd
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How to find the ratio for my rearend

2003 dodge ram 1500 4x4 I dont see a plate or anything on it it has a clicking noise and a vibration I changed the fluid but was told it probably needs to be replaced. After changing the fluid the vibration is better but still there so I would like to prices another one.
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post #2 of 6 Old 07-08-2019, 09:16 AM
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There might be a sticker in the glove box that has the differential ratio.

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post #3 of 6 Old 07-09-2019, 05:31 PM
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Try this link. SHOULD give the build sheet that shows the rear as originally equipt.
https://fcacommunity.force.com/RAM/s/equipment-listing
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post #4 of 6 Old 07-09-2019, 09:05 PM
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Could be stamped on the differential cover or next to it if so equipped. Not always shown as a ratio but number of teeth on each gear like 41 10. You could jack it up and count turns but sometimes difficult, if one wheel off the ground will allow you to turn the driveshaft then it is not limited slip and you count the number of turns of the driveshaft that it takes to make one wheel revolution then divide by two.
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post #5 of 6 Old 07-09-2019, 10:40 PM
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Originally Posted by mikec041 View Post
Try this link. SHOULD give the build sheet that shows the rear as originally equipt.
https://fcacommunity.force.com/RAM/s/equipment-listing
You may have a metal tag under one of the diff cover bolts, but most times they end up missing. As long as it has the original rear that link is your best bet.

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post #6 of 6 Old 07-10-2019, 11:05 AM
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From the internet... (google "How to find the ratio for my rear end")

Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it's a 3.50:1 ratio. If it turned 4 and a quarter times, it's a 4.25:1 ratio.
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