How fast MPH can you shift into 4L?

[powershift]

The owners manual implies that you can shift into 4L between 24 MPH and 2 MPH. I've just been rolling and dropping down to 4L, not sure exactly how fast but its been a smooth transition. Today I tried shifting down while rolling faster (less than 10 MPH probably) and the transmission doesn't pick the right gear to drop into and slowed the vehicle a bit much rather than picking the right gear.

I felt like trying the shift again but the next time give it gas to bring the RPM's up after actuating the transfer case to 4L and on the transmission change from N to D in normal terrain mode. The t-case and gearbox is advance and new so I didn't want to risk a stupid, expensive and potentially disabling mistake and try it. But it does make sense to bring the R's up so that the shift would be smoother if it always drops into 2nd from N while in D?

If it were a manual then I could make the t-case shift in 4L, but have the transmission in 3rd or 4th. Maybe that is what is intended, to drop into 4L then from N into command mode, bump a shift up all in one motion while traveling 15 MPH? lol

How is it possible to drive 15 MPH or even 20 MPH and drop down to 4L smoothly?

 

[djkaosone]

I'm typically in 2nd gear or going less than 10 mph dropping down to 4L. D to N, 4L, and back to D. Now I'm wondering if it's possible to do it while going faster.

 

[powershift]

Next week I'm going to try giving the engine some RPM's after engaging 4L and before going from N to D to see if that will allow driving faster than 5-10MPH and be smooth.

 

[Jimmy Brooks]

I think it’s under 25 or 30 for H-L and if I remember correctly I think you can switch from L-H up to 50 or 70 mph. Think they have this for towing usages so you can start in low and switch to high to put less stress on the transmission when towing heavy loads.

If you want the most accurate answer go into the owners manual and look under low range section, I remember reading it in there.

 

[powershift]

The owners manual doesn't say how to make a smooth shift when at speed from 4H to 4L. But this morning I tried shifting from 4H to 4L at 15-20 MPH and this time brought the RPM's up to ~2,200 after engaging 4L, then while maintaining that RPM shifted from N to D and it was smooth. It needs rev matching is what the problem was. The engine RPM's need to match the rotation speed of the transmission input shaft at the given speed for it to be like buttah. Its my first advanced electronic transfer case.