Re: Transmission Question...
The Pentastar powered WK2s have the Mercedes W5A580 while the Hemi powered WK2s use the Chrysler 545RFE.
The 545RFE tranny has been used in V8 Grand Cherokees since 1999, while the W5A580 has been used in V6/Diesel Grand Cherokees since 2005 and SRT8 Grand Cherokees since 2006.
So to answer your question, your 2008 V8 Grand Cherokee Limited has the Chrysler 545RFE, while your V6 WK2 Overland has the Mercedes W5A580
2014 Grand Cherokee Limited V6 4x4