120mphRS4buggy

Desperately need this part can't find one anywhere and I've called all over I manage my local hobby shop and I've even call people in the warehouse at my distributers and search online for hours

54t mod-1 center diff/spur gear
Part# 60231 from ofna originally

I got this ts4 recently brand new kit in box for a steal and built it to make speed passes put 17mm buggy wheel conversation already has all metal axles and drive shafts,made a slash buggy conv. Wing mod to go on it and made a custom 8in wheelie bar wit a 1.5in wide foam wheel and put castle mix match 12s 1/8scale motor and ESC on it fans on both, align digital (fast asf) servo from a heli modded some strc steering arms to make all that aluminum and it runs 2 6s 4500mah 45c-75c burst R/C evo batterys with spectrum receiver and dx4r pro radio I've clocked it with the GPS unit a few times before I stripped the f*** out of the center diff highest pass without blowing the tires apart or the foams blown out.10 sets of old buggy wheels later we got a pass of 106mph and I never even got more then 75% throttle so I'm hoping new gear or a new metal gear and some gearing adjustment and program the ESC a little wit castle link and some solid wheels or street foams it could 100% do 150mph+ just sucks not one place has any parts for this chassis if anyone's got this center gear or other part for the ts4 hit my messages even if u got an idea where I could find the part or parts plz help