What exactly is needed to change the gear ratio?

[AWSOM50]

Hi guys, I have 3.23 gears (I think)  in my charger and really want to change it to a 3.91 or 4.10 ratio.  But I'm not entirely sure what this involves.

Can someone please tell me what I need to do this?  Are new parts available, and if so can u give me a link as to what I need? (preferably from summit)

Thanks a lot

[John_Kunkel]

All you really need are the ring & pinion and a new pinion seal but it's a good idea to also purchase an installation kit which includes all new bearings, seal, shims, crush sleeve (if needed).

Summit carries several brands, just use their search engine.

[uud looz]

Also if you care about the speedometer accuracy the speedo gear in trans should be changed

[AWSOM50]

OK, thanks a lot guys.  I found em.