Originally Posted by monkeyracing

32819toon the axles you'll need if you're making a wider mini are the same as you'd need for a TL01/FF02/etc. You can get CVDs or just replace the stock dog bones with these 39mm ones.

If you find the axles are loose and falling out of the out drives from the TA03 diff (on your mini or larger cars) you can put an o-ring in the out drive to take up the slack space. For some reason, the TA03 diff allows a little extra play.

If the driveshafts are still too short, then you're on your own. Tamiya makes one size of drive axles for m-chassis cars as far as I know. There are a few lengths when you get up into the touring scale stuff, but when doing a basic conversion as you appear to be, the items listed should work. If you order the extra wide arms (TL01-L or B or somethings?) I have no clue.