I had the RTR ZX5 and i put a 4.5t brushless in it. Neil is right you will need to upgrade the driveshafts and diff halves. After one race weekend my front driveshafts were trashed and the diff halves were also worn. I would also recommend you re-shim the diffs front and back so there is no play.
I have just had to get all the parts for mine so will list them for you.
2 x Steel diff halves LA201 (for front & back) about £10 per set
1 x Universal front driveshafts - 68mm LA231 about £30
1 x Rear wheel axles LA233 about £6.00
1 x Dogbone rear driveshafts LA234 abiut £6.00
To be honest it is not a cheap list and if i had my time again i would not of got the RTR, but in my opinion without these upgrades you may struggle.
Cheers
Dave
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