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Hi, some may remember my account. I haven't been active lately, life obligations got onto me, good ones tho. A friend (John, later in text) and I are back on the speed run thread. After a pause in this hobby, John decided to make his comeback with a Xray T2 007 and a brand-new factory built 3Racing Sakura Advance S, as I understand it is a decent entry level race car. Nothing too fancy, I don't know his final setup yet, but I want to give this challenge a try with my old FF03 that in the last speed run challenge hit 103km/h. I think it was 2020 when we had the last challenge... John drove a AE TC6.1 with a 3s setup and managed to achieve a speed of 113km/h, while my FF03 achieved 103km/h. I don't remeber the rations now, but my setup was a 3s Tamiya TBLE01 / TBLM01 8T sensorless brushless combo. This time it is similar (I unfortunately sold the tble01 combo) with a Carson Dragster 10T motor, it is actually a rebranded TBLM01 10T. I can guarantee this, as the ESC Dragster Carson is identical to a TBLM01. I can not use the TBLE01 esc, it burnt out and haven't found somebody experienced enough to reroute the connection and restore the board. (picture below) https://imgur.com/Xxq94ZH Anyways, the setup China ESC 120A 2-4S (4s will be eventually used, chaos mode ) Carson Dragster 10T 4300kv 2-3S (4s will probably work also but once ) Savox 1252MG (low profile servo, mounted with @wtcc5's technique) GEAR RATION: Spur 64P 72T //// Pinion 64P 60T /// FDR 1.20 diff Spur 52T /// Pinion 20T /// FDR 2.60 FDR: 3.80 (this should on 3s run 103MPH /// 172km/h) There is a Yeah Racing diff set with a 50T diff spur, that would bring the FDR down to 3.70. I already have the tamiya 54471 steel gear diff. My question where I need advice is, what kind of gear diff putty should I use or only oil? if oil? what kind of oil? I obviously will not be racing through corners, I need something that will hold stable under load in straight runs. and please share thoughts and ideas about this setup. 72T 64P vs 35T 48P (for reference) The Chassis Since this will be a 100MPH run, I have put a bit of thermal paste on the heat sink for MAX efficiency The motor The ESC ( ) funny how it can be the same price for 45A 60A 80A and 120A, this is a hit-and-miss Other parts on order This is what racing on a budget looks like if this thing hits anything near 100kmh I will be more than happy. Taking suggestions for body choice!! Tire recommendations are also welcome!