[aarcuda]

3.06 is for the autos and 3.92s for the 6 spds i believe

 

[Cuda340]

3.06 is for the autos and 3.92s for the 6 spds i believe

That's correct. The auto does need as low a ratio because of the torque multiplication of the auto trans.

 

[Thingfish]

Yup, sorry. Just noticed it was listed as auto trans spec..you're right, the manual is 3.92...I'm a dope...getting dizzy comparing models...too many good choices, I can't cope.

 

[Iron6]

3.06 vs 3.92

There is a big difference between the 3.06 vs 3.92. My 2010 AUTO Classic RT came with 3.06 (215mm axles) it just didn't have the torque and launch I wanted. 5th gear seemed to high. Changed it out for a Getrag 3.92 (226mm axles) and a lot more torque even in 5th gear. Difference is night and day. Gas mileage isn't great but I didn't buy the car to save MPG. Drive both models and gears before you buy one. Good luck

Looking on the dodge site I was surprised to see the 2010 SRT rear axle ratio was listed at 3.02 compared to the 2011 SRT 3.92 ratio. I see people going on about the RT 3.75 ratio vs the 3.92 ratio...

I'm considering both a 2010 or 2011 SRT with manual transmission. What am I going to notice between the 3.02 vs the 3.92 ratios? Why did they up it so much? Any longevity issues?

 

[Keavdog]

That's correct. The auto does need as low a ratio because of the torque multiplication of the auto trans.

Can you explain torque multiplication?

 

[LURCH]

I also agree with the other post, my 09 SRT8 with 3.06 was a dog out of the hole. I had it changed to the 3.91 and it made a unbelievable difference. My RPM's is 3050 @ 80 mph & 2750 @ 70 mph now, which is still not to bad. Most of my driving is around town. If I do want to make a 3 or 4 K trip I can just change the center section back to the 3.06 which takes about 4 hr's.