how to float gears in a semi


How To Float Gears in a Semi

Floating gears in a semi truck can be a bit of a process, it’s important to note that this is not a job for a novice or someone without the right tools. Overlooking any of the steps listed below can lead to serious safety and mechanical issues later down the line. Any gear job should be done with attention to detail and should be done by an experienced mechanic.


  • Engine hoist
  • Socket set
  • Gear puller
  • Gasket material
  • Transmission jack
  • RTV sealant


  • First, you will need to separate the engine from the transmission. This can be done using an engine hoist, then disconnect the clutch linkage, shifting levers and other components.
  • Once the engine is out of the way you can remove the pan and drain the transmission fluid. It is important to remember to properly dispose of the old transmission fluid.
  • Next, you will need to remove the shift control lever and disconnect any wiring that is plugged into the transmission.
  • Now, you will need to remove the bell housing mounting bolts and unbolt the bell housing from the transmission. This is where a gear puller can come in handy.
  • Carefully lift off the bell housing after it is freed from the transmission and set it aside.
  • Once the bell housing is off, you can now access the input shaft, clutch and flywheel.
  • It is now time to lift off the transmission, this can often be a tricky process so it’s best to use a transmission jack.
  • Now that you have access to the gears, you will need to remove them and install whatever new gears you are wanting to use.
  • Once the new gears are installed, it is important to carefully reassemble the components of the transmission.
  • Don’t forget to use the appropriate gasket material and RTV sealant to ensure a tight fit.
  • Finally, you will need to fill the transmission with new transmission oil before going for a test drive.

Floating gears takes time and patience, but it is a necessary step for any semi truck after a significant amount of miles has been put on it. This is an important job and should only be attempted by an experienced professional.