Join Date: Dec 2010
Location: Carlton Oregon
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From what i have read about the Ford trans is its a beast. Its one of the best out there on these trucks. They even use this trans in the school busses and last time i rode one that driver was given it hell.
What raises a flag is that you said you ran the SCT tune and the tow haul mode with the truck. Are you sure these two options are syched together to work as one? Some tuners don't account and allow for the tow haul option these trucks have. I am not saying yours doesn't im just throwing it out there.
As for trans temps what i was told by a trans expert when i had my F150 towing my boat, my tuner on the F150 had a trans temp feature is that 280 is not bad. Its not great eighter. Just try not to let it run there any longer then it has too.
His measurements were this.
Always try to keep it under 200 as this will extend the trans life.
200 to 250 in towing is not bad but this is when the trans fluid starts to break down and will require more frequent changes.
250 to 300 is considered extream and requires changes at half the normal intervals as the factory recommendation. So instead of 30K its 15K
Anything over 350 and you are melting your trans and it will fail pretty fast.
Im no transmission guy this is what i was told because i was concerned when my F150 was pulling my boat up a few knarley hills and i was watching that trans temp climb above 200. I had a trans cooler on the truck as well.
As for the F350 she doesn't miss a beat with my boat but i have pulled a 13,500 bumper pull style 28FT Rinker threw Columbia Gorge with a 40 MPH headwind at 60 mph and my trans temp was steady under 200 all the time. Never was i more happy to drop a boat of at the auction just to get it off my truck. I think my truck even signed in relief.
08 F350 6.4 Lariat CC LB tows a 13 Moomba Mojo 2.5
2inch Level kit
Mini Max tuner
Diamond Eye 5inch exhaust straight pipe
HID headlights, and Fog lights
EGR delete <planned next>
Ladder bars <in the future>