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If you just want more acceleration from a start, go with the 3.73 or 3.92 rear. The 3.06 will not make a major difference. I would not recommend the change with the 8 speed but it will definitely make a huge difference with the 5 speed.
 

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Just like GMAC I have 3:73’s plus a 2880 stall speed converter in my supercharged Challenger. I have to be honest going to a long distance car show is tasking. At 75 MPH I am turning 2900 rpms and I get 17.5 MPG. The flip side is this car leaves with a vengeance.
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that's because you're driving a 4000+ pound sedan with a measly little six cylinder that only makes 260 lb-ft of torque all the way up at 4800 rpm. Having driven multiple 3.6 vehicles, I can confirm what you're feeling; that is literally you just getting into the engine's actual powerband at 3000 rpm and climbing.
^ This. As a former 2014 3.6 8spd owner I can confirm this. 0-30mph is a slog but passing is a breeze and decently satisfying. Here’s a few 0-60’s with my 2014 3.6 and you can clearly see and hear how painful 0-30 is. I will say the lack of any wheel spin on my factory 245/45/20’s was great. Instant grip.



 
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