2006 gmc lbz trans limp at 108k miles

[Lbzplowtruck]

Ok so I need some help before I start throwing random parts at my truck. It's a 2006 gmc lbz with the 6 speed. Only has 108k miles on the truck. It all started after a night of plowing. I sprayed it off at the local self serve. Went to pick a buddy up for a bite to eat and the trans limped into 4th gear on our way. I stopped turn the truck off and back on. It will shift through all the gears now but it feels like there is flaring during shifts. Like it hesitates and minute and slips into gear. Also when ot shifts down into first something clunks a little bit. Is it possible something shorted out from spraying off the underbody of the truck. It's throwing a couple codes
P0700
P0757
P0777
U1026

Any suggestions as far of what parts to throw at it?
Might start with a transgo jr install, clean the valve body, and replace the spin on filter and transmisson fluid.

Any help is appreciated, thanks!!

 

[Lbzplowtruck]

Anybody expience this? It's back to shifting somewhat normal, but it's still hesitating when shifting occasionally. And the transfer case seems to clunk when I go to reverse. I'm beginning to think it's something with the transfer case due to the p0777 and u1026 codes. I replaced the spin on filter and fluid is clean, no metal shavings, fluid is full as well with no leaks.
Any help is appreciated, thanks

 

[Lbzplowtruck]

Fyi my codes are as follows
P0757 solenoid b stuck on
P0777 solenoid b stuck on, clutch not fully disengaging, slip between 2 gears
U1026 loss of communication with transfer case control module

 

[Hot COCOAL]

Fyi my codes are as follows
P0757 solenoid b stuck on
P0777 solenoid b stuck on, clutch not fully disengaging, slip between 2 gears
U1026 loss of communication with transfer case control module

Is your truck tuned?
Have you cleared the codes?
Do you have a CEL/engine light on in your dash cluster?

Research the codes...
As far as if you did something by spraying it down, I can't say, you could check and clean all the connection's

I will say that the triple 7 code is known as the code of death and its typically new trans time

 

[Lbzplowtruck]

My truck is bone stock with 108k miles it's tough to just say my trans is toast. Yeah people say the triple 777 code is bad but I also read it could be caused from transfer case issues. Which makes sense since I am throwing a code related to the transfer case. I've done a lot of research but still can't pin point a paticular problem. Might bring the truck to ryans diesel service in Wisconny and have them look into it. But I'd rather do the work myself if it doesn't envolve opening up the tranny.

 

[mattracing169]

I was receiving the U1026 code on my 06 LBZ this morning. However, my truck would only start for 3 seconds and die. Also, all of my electronics went out, as in no PL, PW, or radio.

I know you are having different issues, but you have the same code. What I ended up doing was unplugging my Transfer Case Control Module and plugging it back in. Everything seems to be back to normal with no more code. I would say give it a shot. Only takes a few minutes.

FYI, it is located behind the parking brake assembly underneath the dash.