Well I have driven 5&2 speeds for over 40 years. I can tell you that using the clutch will make the shift not work correctly. When you clutch the drive shaft can come to a stop or get too slow of a RPM and then the rear end can't finish the shift. The two speed part is in the rear end not the transmission.
To up shift, you pull the electric shift button up, let up on the accelerator pedal, PAUSE for just a few seconds and then accelerate the engine speed back up. The rear end will shift smoothly doing it that way.
To down shift: When the engine speed is pulled down under load or you have just decelerated, shift the electric button down to the low side, then let up the accelerator and then accelerate without any pause, I do mean floor it.
You do not "hunt" the speed like you do split shifting a transmission. IF you clutch the shift is actually harder on the rear end. The drive shaft can coast to too slow a speed and that is where you get the grinding and have to stop and start over.
The two speed rear end setups are usually very rugged. They usually don't give much mechanical problems. The electric motors and contact points where the biggest issue. They where not bad if you made sure and kept the contacts clean.
By the way it is not Truck brand that makes the difference. Most of the two speed rear ends are Eaton or Rockwell made. The Eaton's with the double reduction where the more durable ones.
Also some models shifted like this: 1st LO-HI, 2nd LO-HI, 3rd LO-HI, 4th LO, 5th LO, 4th HI, 5th HI. Notice that 4th and 5th are split differently than the normal way.
Long story short you just need to know how to shift the transmission, rear end setup correctly. Just like driving any other manual transmission.
MAKE sure your are driving a two speed rear end truck. There are some Spicer Super 10 speeds that have a shift pattern like the 5&2s but is actually all in the transmission like a normal 10 speeds.
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