FLM ext arms on Elec Stampede

[sack]

I recently got the full FLM chasis kit with extended arms and some other stuff. It didn't say in the description that I need to replace the driveline but do I need to? I got the stock length chasis. If I do, can you please tell me what parts I need to order? Sorry don't know all the technical names but it seems like I need a longer driveline to the rear drive wheels.