i was drivin around tonight layed into it right around the 3-4 shift SES light came on truck was stuck in 4th wouldn't up or down shift plugged in the efilive cable code P0777 came up i researched on here and everyone who experienced this code had stock trans...mines built i've had no problems with the trans at all until this it has maybe 2,000 miles on it since the build and i barely hammer it...what i'm gettin at is did i hurt the trans bad or is it simpply a fluid change like some have said?

Doesn't sound like a fluid change to me. Post #2 http://www.dieselplace.com/forum/showthread.php?t=355461&highlight=P0777
Post #11,13 http://www.dieselplace.com/forum/showthread.php?t=332759&highlight=P0777&page=2

Did George build the trans? If so, why haven't you called him? No one here can help you without knowing hat's done to the trans. Talk to your builder and not us.

Did George build the trans? If so, why haven't you called him? No one here can help you without knowing hat's done to the trans. Talk to your builder and not us.i did got voicemail...he called me back after this post its all figured out!

So what is figured out? I have had the same thing happen. Not built by george though.

im also curious as to what the problem was?

^