Join Date: Apr 2010
Location: Rockton, IL
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What is "normal" for a cold trans...
I'm a new owner of a '07 F350 auto with 152k miles on it. Truck runs fantastic 99% of the time but I'm not sure if this 'one thing' is normal or not after reading people's posts...
When the truck is stone cold, like sitting overnight in 50 degree weather (55-60 degrees by morning) I'll turn the key and it'll fire right up and smooth out immediately. I'll let it idle for about 30-60 secs and then put it into drive. At this point, it still feels good. I live on a quiet HWY, so when I pull out of my driveway I want to slowly accelerate out of town to 55MPH and head out to where ever I'm going.
As I lightly accelerate, the motor's power seems to platuea at 2,000RPM+. If I hold the throttle steady, the truck accelerates to about 2kRPM and then stops accelerating and doesn't shift. If I accelerate harder, the engine will grumble up to 3,200-3,400RPM and then hard shift. It'll do this cycle a second time for the next gear.
On my normal route, I'd travel 1 mile and then turn left... When I slow down and make that left turn, the truck will have full power and the transmission shifts fine (about 2k RPM) from there on out. I can drive it for hours and it runs great.
I've read that "You need to let the truck warm up..." and that the torque converter won't lock up until certain temps, etc. In my mind that would mean driving it gently for a distance under 2k RPM... In rality, if I did that I would be stuck in 1st gear for miles...
Any advise or suggestions?
Truck is stock. Engine oil was just changed by ford dealership. It's going in for a 150k mile service soon. This is my first diesel and my first Ford but I'm a competent mechanic when it comes to gas cars/trucks.