Help with gears

What gear are you in, how much weight you pulling, what rpm are you at and how steep a grade are you pulling?

 

if the truck wont pull with 373 rears it will be a real turd with 342 sounds like you need a 13spd or more power or both

 

If you can not pull a hill in 6th gear why would you try 7th gear? You need to down shift to gain power. If the truck has 3.73 gears going to 3.42 will be worse.

Better question is, was the truck able to pull the hills before it was worked on? Why did you change the turbo? Did someone tell you that would fix your problems? It might be to your advantage to have an experienced shop check the engine. How many miles are on the truck? How long have you owned it? Do you have maintenance records?

 

How was the truck pulling before? Leave the 3.73s right where they are you'll just be throwing $$$ out the window. 3.73s are the best balance between pulling power and still get good mpg if your not constantly running 70+ which in cali you ain't