You may want to specify what year and the mileage IMHO. I am sure you did a search and found there are guys using from 8-12 qts. When I did mine I measured what came out and because I upgraded to a Mag-Hytec pan it added 2 quarts (total was 11.5 qts) after letting it drain overnight. As far as the solenoid is concerned, I would ask the more experienced guys on here. My 16 only had 60K miles on it and was performing fine, but I am now towing a 12K lb 5th wheel more, again the reason for the Mag- Hytec and has been performing well. So I did not need a new solenoid. I did see kits for sale on Amazon which included the solenoid. Is your transmission not shifting right?