converting Durango DEX210 RTR to mid motor

[Wilfnsam]

Hi can any of you helpful people please give me some advice on the parts I need to order to change my sons DEX210 RTR Rear Motor to a mid motor model.

If you could let me know the parts and numbers I would be very grateful. I also notice there are 3 and 4 gear options, which will the RTR have and which is best.

Thanks for helping.

regards

simon R