That 10° can make a difference when that engine starts to make more heat; I don't see how the 180° made a CEL appear. My 5.7 with mild mods runs at a consistent 188°-195° with a 180° stat and no issues. You will either need to swap the back half of the driveshaft with one from an R/T or get a one piece setup for four blade up front, 3 in the back. Those shims I don't know about, I don't have a one piece however if you install the Getrag and don't use a later cradle you will need to shim the differential itself just a little bit so it doesn't transmit vibration through the floor pan. Can't help you with Cali shops, I avoid CA like the liberal plague it is lol.
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05 Magnum R/T, 12 Charger SRT, 03 Hemi Ram
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