Ishift mountain grades

I recently purchased an ishift 670. I did not envision driving mountains and preferred to stay within 300 miles off my home terminal. Now I have decided to make a run to Colorado to phoenix to San Diego. I do not have a manual mode on my truck(at least not on with gear selectors). My question is does the ishift hold gear on its own or do I have to manually do something to hold the gear? In other words if I am loaded at 65000 lbs going down a 6% grade foot off the accelerator in 7th gear will it hold itself or do I need to do something to hold the gear. On my lever control the top position has a m that I believe holds whatever gear your in at the time(i do not have gear selectors so I no this stand for manual but I think this position only holds my gear?) Do I throw the lever in the m position when going downhill then put it back to drive mode when finishing a grade? Again not very familiar with mountain driving with an ishift.

 

Thank you that's exactly what I discovered notmycbhandle as I was tinkering with my jake and downshifting on overpasses here in dallas. As you said hard to get the right gear as it likes to skip gears. Being under 65000 gross all the time I think as long as I am in 6 to 8th gear I will be ok for the grades I will be on. I used to drive a 10 speed been through the Eisenhower once and hwy 93 in arizona and did fine. It's been a few years though. I was also tinkering with the cruise control and cruise jake and I have to get used to not pushing on the gas once I put the cruise on(I think I would do the cruise method if I knew the routes better). Both these responses helped a lot thanks for taking the time to respond.