Agree, do not do gears if you are in hilly area.
Yes, do a high performance/voltage battery. Don’t take my word for it, but I believe Bolt is on the lower voltage side. Ie. Less than 24s lfp.
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I am just seeing the comments. I live in indiana. Not many hills here. What ill use it for I dont think itll ever see any type of hills. Gears are being installed after all the new bearings and seals come in. I also have a 160ah Bolt energy 48v coming to install with 0g wires. My next question is what controller and motor work best for thr 2016 Gem. I read it is a 19 spline shaft and I believe a club car or ezgo motor will bolt up no issue? Just wondering whats a user friendly plug and play unit that has been used and reliable.
Gem motor is capable of more, however is limited by the speed controller to save battery and reliability, @Inwo controller is a High voltage one so Paired to a HV battery (he runs it up to 100v) will get you torque and speed up hill. at some point he was also selling some 8kw motors but I think they are gone now. all this potential won’t be unlocked with a single 48v battery, it has to be 72v and over. Dave will be able to answer your questions properly
The oem motor of course! 
The Sevcon is also a good choice and is infinitely programable.
So moreless everything i have tried to do or bought to do has been wrong and I wont expect much out of it. Was hoping since I went with the bolt 48v 160ah and the gearing it would boost the speed a little or atleast get me in the 45-50mph range reliably and not slow getting there. I am lost in all of this.
You were following advice from R$F right?
No, I originally bought just budget DC house 48v 100ah thinking that would work. Another person said well, that 100ah isnt going to be enough your range is going to suck. Directed me to something 160ah or more then threw out the name Bolt Energy. Paying for that was salty for sure. And I know some cost even more.
I have absolutely no clue what I need. I went with the r4f gears because at that point I had not even heard of this forum and outside of this forum there is not much information. I was trying to do it right the first time. Figured gears gave me the speed while keeping rpm down. A good battery would help provide the power and a motor/controller would possibly add to the speed and reliability. If a reprogrammed stock controller is possible while keeping the stock motor im game. I just do not know who to talk to to make it happen.
@Inwo if you can reprogram my stock controller or sell a reprogrammed one or whatever way it happens just let me know.
The oem controller can’t be programmed. I can sell you a high voltage, bolt in controller, but gains may be minimal with the Bolt battery.
I’ll look it up to see what voltage it is.
I onow it’s too late now, but this is where the Gem gurus hang our.
Why don’t you see where the gears get you. R4f should have given you a good estimate. 40mph or so, I think. If that works for you, then you are done.
I haven’t done any controller kits for a while, so it will take a bit to get up to speed again.
There are two others on here that may still be waiting for kits. Or maybe the got tired of waiting. Im not sure.
I got busy with new projects, and it seems that I can only concentrate on one at a time.
I had a partner when I was actively marketing last time. I need to set aside a big block of time now that I will be going it alone.
Good news. Well sort of. It looks like the bolt battery is 16s. Normal voltage for a 48v standard performance battery.
My controller will work with that.
Can I assume that ship has sailed?