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I had the same symptoms and it turned out to be my planetary gear set. Below is an excerpt from an old post of mine.
The dealer wanted $3700 for a re-man with 3 year warranty or $3000 for a rebuild with a 1 year warranty. I opted to take it to a shop here in town that was recommended by a few coworkers. The owner seemed knowledgeable and honest on the phone. He would rebuild for $2000 to $2500 and include a 3 year/50k warranty and some upgrades. He explained that the gas engine version of the 4R100 came with an aluminum 4 pinion planetary gear set while the diesel version came with a steel 6 pinion planetary gear set and that he would install the steel version when rebuilding my tranny. He was also aware of the sonnax/tricumulator mod and based on my light towing said he would recommend what he called his mild kit which firmed up the 1-2 shift but left the others closer to stock. $2350 later and the tranny does shift much better than stock.
Sorry to be the bearer of bad news....
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2011 F350 Lariat, SC, SWB, 6.7L, 4x4, 3.55ELD, FX4, Lariat Int Pkg, 20's
Ordered 10/27/2010
Delivered 12/13
2003 Mustang SVT Cobra, black convertible. - 6/2007
2002 F250 Lariat, V10, 4x4, auto, 3.73LS, SC/SB, camper & off-road pkg. 12/2001 - 12/2010 - SOLD
Link: Differential Cover Spreadsheet
Link: Fuel Mileage Spreadsheet
Link: Rapid-Heat Sup Cab Heater Test Graphs
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