I'm currently looking at doing just that to my XXX4 also.
What I think should be possible is to push the front wishbones further forward to straighten the driveshafts. You'll need longer hinge pins and you'll need to space the front hinge pin brace further forward but I reckon it can be done.
I also tend to run mine with the rear hubs spaced as far back as possible but stretching the front seems to be the easiest option I can think of.
I think you'll need to be ingenious with regard to fixing the front bumper because you'll lose the two screws that bolt through from the front gearbox housing but I'm sure that can be overcome.
Sorry but I've not got any pix yet - but I have got myself a set of the longest Losi Ti hinge pins I could find (LOSA6094) which are 2.125inch long as opposed to the standard car's 1.90inch front pins - so I should be able to achieve about 5mm I reckon.
Stering ackermann will change though which could create further problems to solve.
HTH
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