Changing gear ratio
 

I am looking at changing the gear ratio on my 2016 F150 XLT V6 Supercab 4X2 from 3.55 to 3.73. I want to increase the towing capacity so I can pull a bigger trailer. Is this something that is possible? Thank you for any advice.

Depending upon how frequently you're towing, could be a waste of time and money.

I'm looking at buying a trailer to live in. I looked and the ones I liked were in the 6-7k lb range And my Max is 5000 lb. If time/money is not a factor would changing the gear ratio make it possible to tow that weight.

No

There is no way to legally increase capacity.

However 5000# seems very low. Where did you get that number from?

Second, payload is the far more restrictive issue you need to look at.

That is what is listed for my engine/gear ratio. The payload is 1610#

Is it a 3.5 V6 non Ecoboost?

Yes

Those are limited in towing Capacity.

Actually the one rating you can increase is GCWR as its strictly based on engine, tow package and gear ratio. It is not in any way related to payload which is yellow sticker rating, hence why you often can't get to GCWR without being over GVWR. It's only a number related to making sure you don't hold up traffic by being to slow or overheating while going uphill etc. Some specs to get to absolute max numbers would require HDPP others do not.

The dealership would not do it even if I wanted to. They said it could void the warranty which I don't get since Ford lists the same engine with 3.73 at 7800#.