The plastic axles are crap even on 2s so you'll no doubt need Tekno's or MIP X-Duty axles along with the King Headz motor mount and slipper adapter. Diffs will be fine as long as they're still in good shape.
He's not kidding about the plastic axles. I looked at mine last night and this is what I found.....
With all the curved tabs, oval holes, and twisted half shafts my axles have at least a 1/4 turn to them. They will probably fall apart any day now. After I saw how bad they were I started researching MIP X-duty and Tekno CVDs and after a lot of deliberation I decided to go with MIP shafts. Hopefully they will get here before the old ones give out.
Update....The rear right drive shaft broke today.
(Last edited by Silly Old Boy : 7.29.14 at 1:28 pm)