Whats the best way to increase rear traction on the Z Truggy

Hi Guys whats the best way to increase the rear traction on the Z truggy and please remember i only have the standard pro chassis .
Also am thinking of getting the buggy and truggy extented chassis and also may upgrade my shock pistons .
so was wondering if these make much of a difference to buggy and truggy handling???????
any info would be much appreciated....
also would i need to change the setups much for the new chassis ???????
that is once i get back to NZ from Australia after our holiday
Cheers
Dave

The extended chassis on the truggy makes a world of difference. The biggest tuning factor is tires. But if you have the tires that work on the track and the truck is still loose you can change your diff fluid in the center to 10. I think you said you had 10f,15c,7r. If so try 10 in the center. This has been tested and works really well on a loose track.

Buggy ext. chassis does make a difference but not as dramatic as the truggy chassis.

Sorry it took so long to get back with you.

Thankyou for that and i discoverd that one of my rear top arms had somehow moved 2 mm and had made my camber different and i think your bang on with the tyre thing thats something i must work out but i will get there and once again thanks.
Cheers
Dave
PS thanks for the info on the chassis and i will definatly be getting the truggy one from you guys. and possibly the buggy one as well but will see how it goes as my ws7!! is buggard and need a new motor for my buggy.