P0777

2004LB7

Super Moderator
Staff member
Dec 15, 2010
7,125
2,221
113
Norcal
Well my trans threw a P0777 code today. 2nd time I've seen it on my truck. First time i was racing it on some back roads about 6 months ago. Thought it was a fluke.

Today i was just accelerating from a stop, a little bit aggressive, and then the truck seem to just slow down. No odd noises, banging, or harsh shifting. Then it popped up the CEL and stayed in 4th. Stopped on the side of the road, pulled the code and cleared it. Ran fin after that

I guess i need to step up my savings for a built transmission

Because of my 4:56 gears, i am in 5th & 6th gears a lot. I know my last Mike L built trans had pritty stout 5th gear and never skipped a beat. But... i want to turn this one up a bit more then my LB7. Is there any specific upgrades that i could get on a built transmission to beef up 5th and 6th more then the standard build?

Also. How long did any of you last on a P0777 coded transmission before it got bad enough that you had to get it fixed? Just so i know how much to put aside monthly. Or perhaps weekly :woott:
 

2004LB7

Super Moderator
Staff member
Dec 15, 2010
7,125
2,221
113
Norcal
Its just a stock trans with a transgo jr and pression converter. (I stole my converter out of the built 5 speed)