How to make a working AWD in LeGran?

I want to make a working 4WD but I don't know how. I'm doing 2 setups for LeGran, one is Handbrake drift box (FWD)
and the other is a sport-touring off-road car, which is about to have an AWD.
I hope someone will also write what parts to replace because I replaced the gearbox and transfer case.

 

You must replace:
The gearbox, the transfer case, add a rear differential, and put on the AWD exhaust.

 

and the awd fuel tank

 

how to add rear differential lol

 

might want to change the rear suspension to the one that supports it, afaik, rear independent suspension should have the option,

 

it works, thanks for help

 

lol how does that even work?

 

Different shape fo fuel tank that lets the rear driveshaft pass through I think

 

Just like the exhaust.