Power loss in 10th gear

I have a eaton fuller transmission and a small block Cat motor c13 i believe... for the past 2 wks my truck bogs down in 10th gear as it hits 1500rpm just as the turbo should cut on. Turbos and motor work great in all other gears. But in 10th , no dice. It goes into gear fine....

And when i say "bog" my exhaust sounds very loud and makes a sound almost like a jake brake... please help

 

Thank you brother! Thats exactly what it was... thanks again, i was nervous

 

Thanks brother it was the fuel filter... im new to the trucking biz... haven't changed the filter since last summer smh... now i know to change every 3-6 months.. thanks man cheers

 

You guessed it! Dirty filter it was... thanks man

 

It was filthy! I switched it out now she runs good as new! Thanks brother