wanting to change out my auto out of my 06 4x4 qcsb to a manual, What the truck has in it now stock 48re shifts great no problems only 65000 miles on the truck always serviced according to manual, electric transfer case, truck is stock other than exhaust. could someone give me some basis to go off of to start sourcing parts not sure how easy it will be to just find a parts truck, I see alot of references to getrag 56's why is this arent they an older transmission I had a 56 in my 1st gen, any help is appreciated