Hi,

Thanks to all of you for your answers and opinions.
I don't know if I have really well explained because you are talking about having the rear axles swept back or forward, but my question was with the same rear arms positions, so with the same rear axles positions. I'm talking about move forward the gearboxes only. I agree with the angle of the rear drive shafts. The angle depends of the system you use (CVD - CVA...), but all the systems have an angle limit. If you take a look at the maximum angle you can drive with yours (on EB48 or NB48), you will see that this angle is not reached even if you move the gearboxes about 15mm.
I know we can't compare CVD and CVA angle limits, even if they are closed.
The situation I'm talking about is the same with the actual front drive trains.
On the front drive trains, because of the steering, this angle limit is reached on many chassis brands, and it doesn't seem to be a problem. But I agree it's with the CVD system. I just think that CVA system can drive with a diff swept forward, because the angle is the same with the shock travel. If you can have a angle about 25-30°(between the outdrives and the shafts) because of the maximum shocks travel on the rear train, whatever it's for shock or a diff swept forward, the result is the same for the CVA system.
(I hope you will understand me, my English is not fluent, I don't really know if I use the right words).
Thanks,
Bye !