Possbile Transmission Issue.

Unloaded last night and drove back to the shop in Louisville for a another load. I didn't book a load yet due to the truck needing a service and a coolant leak inspected.

Our mechanic did the oil change, serviced the A/C system, and adjusted the brakes. As soon as I tried to back the truck out of the shop, it didn't feel right. The auto would lunge slightly backwards, auto would go into neutral, repeat until I got out the door. Hooked to the trailer and went for the interstate. I couldn't get the truck over 35 mph. Transmission shifted as it should, but had no power. Owner was afraid the turbo went kaput. The truck is a '07 386 with a ISX ifyanknowwhaddamean

Mechanic suspected the new fuel filter was at fault. He replaced it, but nothing changed.

Then, as I reved up the engine, we heard a clunk. As I revved the engine up and down, the cluck would always happen at 1100 rpms. We couldn't identify where the clunk was coming from.

Off to the Peterbilt dealer. On the way, the truck would downshift on every slight hill and keeping 60 was pushing it. Got off the ramp, went to take off from the light and the transmission wouldn't shift out of second. But it would shift manually. Then I get a code "F" on the display. The transmission wouldn't shift nor would the engine rev. Shut it off for 2 minutes. Restart and it shifted normally to the Peterbilt dealer.

I don't know the transmission designation, but it's a auto 10 speed with a clutch. Clutch was replaced 6 months ago.

What do you think the outcome will be?

 

It's a 2 pedal. It all started like there wasn't enough power hence the 2nd fuel filter change.
I doubt if it's a tranny issue as I never go to the pickle parks

 

Wow..19 speeds

This is my first 2 pedal 10 speed. For the most part, I like it. It's much easier to talk on my hand held cell phone while driving surface streets.

 

I can run across an intersection faster then this bobtail, but I like it when the truck is loaded. I would love to be able to program the transmission to engage the clutch sooner, downshift sooner when climbing a hill loaded, and to be able to start out in a higher gear when unloaded. It always wants to start out in 2nd gear in D or manual.

 

The dealer said the idle was 750, but is supposed to be 600 and downloaded a new Eaton program into the ECM.

They couldn't tell me why the transmission wouldn't shift nor why the ECM derated the engine power.

"Something to do with the electronic engine control"

I had better bring some motel money on my next trip.