Technical question about cement mixer truck..

This answer may need to come from Gabester but how do I lock the rear axles together? I want all powered axles to be locked.

Also, how can I make the front axles powered? I assume this involves adding the front differential as a parts option.

 

Ok. Whats the process for making the front wheels drive, even if its an open diff?

 

thanks

 

Many problems. I inserted the diff text but it doesn't work. Any ideas?