Hi Matt, I'm not real good on the computer yet, so i'm not sure where to find a link etc, but the mgt is the exact same truck as the mta-4, not sure if Thunder Tiger joined up with Associated or what, but Proline make the 23mm hex adapters & are around $40 australian for 4. Not sure what that is US ? Allso , check out Tower hobbies on the net, or RCMushroom on the net, just look for 23mm hex drive adapters for either the T-Maxx or Thunder Tiger MTA-4. I've allso got them on my T-Maxx as it's running alot of hop-up stuff alloy shocks -chassis-bulk heads etc, & i put an O.S.18TM with a larger alloy pipe R.O.A.R. legal , which gave it heaps more bottom end & allso wants to wheelstand all day long, So......seeing both trucks now had 23mm hex's , i allso had to buy 40 series rims , which are a larger diameter rim but the beauty of that is being able to run a lower profile tire, which gives that edge in handling , cornering etc with no side wall flex. The rims & tires are allso pro line, hang on man, i've just found an ad for the pro line 23mm HD Hex adapter & it says thewre's 3 different types , but the one's you want are - part # 6034-00 ..........they fit - All Maxx trucks ( T&E Maxx) Revo , MGT , MTA-4, LST, TNX. if you can't find em , try www,prolineracing.com & they allso have the tires & rims you'll need. I've got 2 types of 40 series MT Truck tires on the 40series rims, one is the bow ties, theyre great for racing, very low profile, absolutely no tire roll at all, hence you'll see most MT trucks that're winning races are running them, (not sure on how long they'd last if you're driving on any surface other than dirt) & the other are the big joes i mentioned earlier, they're alot wider & a little higer profile than the bow ties, but have an indestructable tread, i've had them on all surfaces for over 3 yrs now, they're kept mainly on the MTA-4, as they just seem too big on the T-Maxx, allso you will loose a bit of top end speed as the drop in tire diameter will change you're gearing. Try going up a few teeth on you're pinion gear, & down a few teeth on the spur gear, that should even it out . But if you just get smaller spur alone you will have a killer truck on the track, as you can't get too high a speed up top end on most the tracks i've been on. The big joes are like moto x tires & the MTA-4 -MGT is a heavy truck aye, but it now drifts & wheelstands on comand, even with the stock 4.6 engine mine came with, the O.S.VG.30 isn't a race engine , but i got mine cheap $200 australian, & it hammers, very easy to tune, & is like all the os engines i own, very reliable. So i hope i've been able to help a bit Matt, i'm learning how to put photo's on attatchments etc later today hopefully, so i can show y'all what i'm talking about ok. Cheers man ,
    Happy motoring , Tony.