Originally Posted by Boulevard
5.0's with the 3.73 gear set are fairly common so keep on looking. I myself tow 6000lbs with the 5.0 and the 3.55 gear set. I would feel very comfortable pulling 7500lbs with this truck.
The only difference between the 2 trucks is the gear set and nothing else. They are both 100% identical in every other respect. If you were to buy the 3.55 truck and than try to have it 'upgraded' to the 3.73 the shop would probably take your money and then laugh your face. The 3.73 is virtually identical to the 3.55 and does not offer any sort of effective change. 4.10's as mentioned, is another story.
Please realize that every FORD dealer in of north America must have been instructed to upsell their product. If they aren't pushing the ecoboost than they are pushing the 3.73 in an upscale model like the FX4. Stick to your guns and buy what you want.
I don't think most Ford dealers got the instructions to upsell their F150's in the performance part of the options. Here in the Mountain West dealer's stock 3.55 axles. 3.73 if you special order mainly the work truck types. If they were upselling there would be a lot more Max tows and HD package trucks on the lot.
What they upsell are all the bling options which turn the F150 into a high profit margin unit but at the same time make it a Extra Large car not a truck.