Toyota tray back 79 series 2006 suspension

I have a VDJ79 with a 600kg upgrade. I have a few tools etc on board most of the time, but it is a fairly hard ride without a bit of weight on it. Depending how much tow ball weight you have you may be better off with polyairs or just extended shakles to account for the drop in height, with the standard springs.

The towball weight of a big van may only be 100 to 200kgs? Maybe you have other stuff on the tray to allow for?

Cheers, Wooly

I have a VJD79 with the suspension upgrade of 600kg.

I also have BOSS air bags to keep the ride height level when towing our offroad 6.2m 'van

The ride is firm but not harsh when not towing but I am around 3700GVM when not towing....

Basicaly ugrading the suspension will give a firmer ride but not necessarily more comfortable than the present ride you have...

It is about a trade off between a safe load on a suspension upgrade designed for that load as against a softer and perhaps less safe ride if you are overloaded or approaching full load pre upgrade

I have the Boss airbags and ARB 600kg leaf rear suspension.
I'd leave yours alone and see how it is. If you find its too hard with no weight on board, then reduce your tyre pressures to say 28 psi and see if that's better. With no weight, you don't need higher pressures.

the standard springs really are quite woefull Ive driven plenty of new ones and they dont keep the factory springs for long before replacing them

that generally adds about 2 inches or so of lift because it seems the factory ones come out factory sagged
the first thing i noticed when going from a 75 to a 79 for work was with the same load the 79 sagged like a coil sprung patrol
they may well be comfortable enough but upgraded springs will improve things alot