Thanks for the tip about the air filter. I probably would've remembered the filter after having a closer inspection of the car, or going to the hobby shop with a list of stuff to buy then realizing when I get home I forgot to buy a new one. I was thinking about the diff gears today & I have a couple tubes of Tamiya's Molybdenum grease which comes with a skinny nozzle to put grease in the right places. I was going to use the reference pics of the Rustler at the Traxxas site, & I think I'll take photos of my used rustler before & after assembly for my own benefit. I hope that I don't have to replace the engine as the engines specificaly for Traxxas nitro vehicles are over $300 & out of stock, although there are replacement engines I could buy. I just noticed I can buy complete front & rear differentials, but I'll check out the ones on the car before forking over $100. I also found a parts car with the engine which is nice, as most traxxas cars I've looked at don't have one. I started looking at Kyosho cars to repair & T-Maxx's, then I asked myself how many projects do I want.

Thanks for the reply
https://www.ebay.ca/itm/226849326284. This is the deal I wanted to buy except I was being outbid & chose to buy something else
https://www.rcscrapyard.net/ca/ I found this website when searching for more information about radio control models.