68rfe transmission only has reverse

[Cory Stoudemayer]

07.5 2500 mega cab 4x4 h&s mini max deleted. Transmission was just rebuilt 6000 miles ago. It only has reverse and no forward gears. You can feel it catch if you put it in 1 gear and 2 gear but it will not move at all. Fluid is good and filters are new. Valve body appears to look ok. Throwing 1st gear ratio code. I replaced all the sensors on the side of Transmission. I have had enough of this truck and don't know what else to do. Please let me know if there is anything I can try! Thanks

 

[sag2]

So you only have a P0731 and no other codes? Did it fail suddenly or give indications that something was slipping? Have you got a scan tool that you can read line pressure and speed sensor values? Have you actually dropped the pan to check things, or just looked at the fluid on the stick? Any repairs immediately prior to the failure?

 

[Cory Stoudemayer]

No other codes. It was rebuilt 6000 miles ago and then the overdrive clutches went out where I had no 4 5 or 6 gear. So took it back to the shop and the clutches were scorched so put new clutches in it and he claimed he drove it for about a 100 miles and everything was good with it as long as the mini max wasn't plugged in. If it was plugged up he said it was spikes in the line pressure. So I went and picked it up on my trailer and I literally drove it 1 mile after I got back home with it and now it won't move forward only reverse. So I climbed under the truck and found that the line pressure sensor wire was unplugged so I plugged it back in but still wouldn't move.So I hooked up a snap on scanner to it and everything looks good besides the input speed. The motor is at 650 to 700 rpm but the input is only like 200 to 250 rpm so changed the speed sensors still nothing. I have dropped the pan twice now and took the valve body out, put a new solenoid pack in it and inspected it and cleaned it but still no forward gears. The ecm went out on it shortly after I got the transmission rebuilt the first time. I am about ready to burn this thing to the ground!!

 

[Ozymandias]

Let me guess....

They didn't do the relearn process to the transmission after overhaul.
That leads by default to the destruction of the Transmission.

 

[Cory Stoudemayer]

I pretty sure they relearned it after the rebuild the first time but not sure on the clutch replacement the second time

 

[Ozymandias]

The motor is at 650 to 700 rpm but the input is only like 200 to 250 rpm so changed the speed sensors still nothing.

With unlocked Converter that will be what you see idling.
If these values, engine, input, output are out of spec the Truck will go into limp mode and tell you this.

 

[Cory Stoudemayer]

Truck does not go into limp mode at all. Only throws the 1st gear ratio code. With the scanner hooked up and trying to do the each gear test with the scanner it said test denied engine not running. But the engine is running!

 

[Ozymandias]

According to this thread you probably broke a hard part.

https://www.cumminsforum.com/threads/p0731-trans-code.611636/

Thats also why you don't have limp mode, that would be 2 gear start and that it can not do in this case.

Sorry

 

[Cory Stoudemayer]

But mine won't move period 4x4 4x2 manual 1-6 clear code. Nothing will make it go forward only reverse