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Old 11-13-2012, 01:11 PM
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Question 2013 Dodge SXT rear end ratio

Which ratio would you get and why? The 3.06 or the standard 2.56 rear end?
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Old 11-16-2012, 04:54 AM
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I have 3.06 on my 2011 so I guess I'm a little biased. It was already on the car otherwise I would not have added it BUT I am glad it's there now...

I haven't driven one without it so I can't compare.. but others have said it's a significant difference..


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Old 11-16-2012, 09:31 AM
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Are you looking for performance or gas saving, I have the standard and it does fine for me, I hate to be at high Rpm just cruising as this is my daily driver


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Old 11-16-2012, 10:31 AM
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I have 3.06's for now. They do good,if your looking for that extra pick up
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Old 11-17-2012, 01:40 PM
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Go with the 3.06's. My 2011 is the higher 2.65 gearing. Way too high. I wish I would have gotten the 3.06's. Don't even consider anything else. The cruising RPM will not be that much different and you will drop about a 1/2 second in your 0 to 60 times. In my opinion the 3.06's should be the highest gearing you can get with the 3.6l engine. I don't know what they were thinking!
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Old 11-18-2012, 10:06 AM
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This is going to be a dumb question, but I am new to muscle cars. Does anyone care to explain what is meant by the 2.65 vs 3.06? How do you know what you have, and how would you go about changing it if you wanted?
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Old 11-18-2012, 01:09 PM
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Originally Posted by crrowley12 View Post
This is going to be a dumb question, but I am new to muscle cars. Does anyone care to explain what is meant by the 2.65 vs 3.06? How do you know what you have, and how would you go about changing it if you wanted?
It refers to the gearing in the final drive (differential).

For each 2.65 rotations in the driveshaft there's 1 rotation at the wheel.

A 3.06 would increase the gearing ~ 15.5%. This would give some faster acceleration rate, with some decrease in fuel economy.

It would be similar to going from 5th gear (.83:1) to 4th gear (1:1) with the 5 speed automatic.

Or being on a 10-speed bike - lower gears allow you to climb hills and grades with less effort expended. At downhill or level conditions, you shift up to to higher (numerically lower gear).

Its not cheap to change ring and pinion gears after the fact, as there are clearances (lash and pre-load) that must be set precisely to avoid gear noise and wear. Plus the cost of the near R&P gear sets.

The $100 option from the factory is about the starting price for a R&P set alonge would run (probably more like $175-185), then the labor to have a driveline shop set up the new R&P gears...

Another way is to swap the center section (aka 'pumpkin') if a good used one can be found and its a bolt-in operation. Not sure if the 215mm (3.06) uses different axles/half-shaft from the 198mm (2.65) unit or not...

Most of the V8 automatic cars (300, Magnum, Chargers) may have the 215mm 3.06 rear ends, but there were a few out there with the other 198mm with the 2.65, 2.54 gearing. There's likely the ID label on these units that indicate the gearing they're equipped with.
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Old 11-18-2012, 01:19 PM
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Wow, thank you for the information. Always nice to have someone clear those things up.
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Old 11-19-2012, 06:01 PM
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the 11's on up base v6 cars now use the new 200mm rear end with the 2:65 not the 198mm, dont know if any other lower gears are available for the 200mm
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Old 11-20-2012, 07:53 AM
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As opposed to many (most?) here, I purposely got the 2.65 over the 3.06 and both were available on the lot. I knew I'd be doing a lot of distance everyday and wanted the V6/2.65 combo. I felt for my driving needs, I wanted it as 'leggy' as possible and I'm glad I did. The car really gets on it after 60 mph, for a V6 and I like the 1500+ r's at open road cruise.....smooth and quiet.....and I'm averaging 28+ mpg, each tankful. (unless Mrs 2LZ does some time behind the wheel!)

Even with the tall rear-end on the tight, steep mountain roads I navigate, the auto-stick does the trick on that. Let's you really pick and choose your RPM's without having to bury your foot.

I could see if I was going to be doing mostly city or 'burb driving, the 3.06 would add a bit of off-the-line spunk.
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