[EVO8]

I notice that the 300C comes with a 3.07 rear axle ratio. Has anyone put in a 3.64 or other gear ratio? I have done this on several vehicles in the past and have yielded outstanding performance gains. The only problem I foresee is speedometer calibration. Is there something out there that can program a different gear ratio or compensate it in some way? I'm not too familiar with Chryslers so forgive the ignorance.

 

[magnuman]

I believe that the LX's with the Hemi engines, Magnum RT, 300C, and Charger RT all come with a 2.82 rear end gear. The SRT 8's come with a 3.07 ratio. The AWD Hemi's come with 3.07 also. The V-6 models of the LX's come with 3.64 (3.5 engines) or 3.90 (2.8 engines) gear ratios. Unfortunately the carriers for the Hemi equipped 2WD come with a totally different carrier than the others. I believe they go by ring gear diameter to identify them.....210RII and 198RII respectively. I think the SRT's have yet another carrier. They are all open differentials. I have also read somewhere that someone has retrofitted a completely different differential in the LX's, but don't remeber where I saw it. Also don't know if you can switch out the entire carrier....will the axles/driveshaft mate to the smaller unit? Can anyone add to this?
Personally, I'd opt for the 3.64, if it ever comes available.
Just found another thread by "maneval69" that elaborates a little more:
http://www.300cforums.com/forums/showthread.php?t=9562

 

[Dutch]

The only ring and pinion gear sets available in the right size for a 300C is the 2.82. The 3.64 and 3.90 are smaller and won't work. FWIW, all Chargers have 5-speed trannies and even the V6 version gets the 2.82 rear end.

The 3.07 in the SRT-8 is too large for the regular 300C rear.

Fow now, you are stuck with stock, but it won't be long before there are aftermarket options.