Cold Stalling on any incline, ok when warm, please help

From : hwsw49

Q: maybe on the ford they give one rating based on non-synthetic and a higher rating if you use synthetic. well the owners manual for both my 2002 ram 1500 and my 2004 dakota qc both state that if i tow i should replace the diff fluid with synthetic. guess that means i shouldnt tow anything without synthetic and if i replace it with synthetic then it bumps my tow rating up to the published tow rating. jph greg surratt wrote found in the ford group i am towing a 17000# fifth wheel with my 2000 f-550 psd 4.88 rear. the rear differential has full synthetic i understand this bumps up the f-550 gcwr to 30000#. gosh. instead of worrying about being overweight maybe we should all just go to synthetic lubricants to increase the tow capacity .