I have a jato with new 3.3 in it and it rocks! I don't get what you mean by receiver mounted in back? Stock location for it is the box in front of the engine on the left side of fuel tank. As for your servo, change batteries if using aa still, charge it if using 5 cell pack, if it is moving slow it is usually low batteries. My throttle servo crapped out on mine after I ran it in snow and ice without enough waterproofing, so replaced it with futaba S3003 I had laying around. Otherwise it has been very very durable and now with 3.3, VERY fast indeed! Also tried battery pack both rear and front location and so far prefer back location. I get better traction this way and the rear end doesn't get so squirrely around corners. As for strength, yesterday went to a empty park and set up a ramp about 18" high and jumped abou 8 tanks of fuel on pavement at pretty high speeds and many landings sucked pretty bad and only damage was body scuffing and ground down body mount posts This thing rocks!