2013 F150 5.0 4x4

So long story short, I was pulling my travel trailer and couple weekends ago and about 30 mins in I had terrible shifting issues. Well after paying attention to what it was doing, it was basically avoiding 5th gear altogether. Either direction from 4th to 5th or 6th to 5th. As soon as it tried to go into 5th, it would drop down to 1st gear until it re-established the correct gear, usually 6th. But bottom line is it would not go into 5th.

All this was accompanied by the wrench light with code p0735 which is this infamous “gear 5 incorrect ratio”. It would also do it without pulling the travel trailer. Just normal driving, mainly after coming to operating temp.

So after getting back home, I took it into the shop and they had it pretty much all day and came to the conclusion that it needs a new transmission for a pretty penny. I told them to hold off and I would go pick the truck up and baby it back home.

I had a thought on the way there, my last ditch effort was to put my truck back into the factory tune. Instead of the 87 octane tune with firmer shifts.

Well that was 2 weeks ago and it hasn’t acted up once or gave me any codes, lights etc.

So my main question is, is my transmission fine now? Or am I just masking the problem of needing a new tranny? I’m not 100% convinced that it was the tuner because I’ve been running it with a tuner for the last 6 months without issue.

But it’s just almost too much of a coincidence that I quit having issues directly after taking the aggressive tune off.

Any insight to this would be very much appreciated! I really like my truck still, but I’m not paying $8k for a transmission when it has 180k miles on it lol

 

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Also... There are year specific forums which better serve non-general F-150 issues/topics..

 

Hello, any news on that? I have same issue

 

Dropping to 1st gear sounds like the classic lead frame issues in the 12th gen that didn’t get the dealer programming to fix that (still requires a new lead frame).