Shifting a freightliner century

If the truck is shaking it's called a freightshaker for a reason. Are you lugging the engine?

What's the rpm when it's shaking?

 

Depends on the transmission. I'll assume ten speed. If I remember right and I probably don't those Detroit 60s liked a little higher rpm. Don't upshift when you're at 1300, bump it up to 17 or 18

 

Don't shift at high RPMs you will never get it in gear. You want the exact opposite. You shift at 1,000 RPMs or less, in low range. You do this because you don't have to match the gears and it stop all that shaking. You don't need 500HP to get rolling from a stop.

 

why you shifting less then 3rd anyway. you can start off higher. the jerking is from you starting off too low

 

On flat ground.....my rig likes 1,300-1,500 for gears 1-6, and 1,500-1,600 for 7th. 8th-10th aren’t as picky.