polyair bellows

goveroo,

If you are talking about the air bags that go inside the coils, then I would say go for it. I have had them on three vehicles in a row and they work well and reliably. I have just recently sprung a leak in one so I will soon work out how good their lifetime warranty is if it is a bag problem (it has only done 260000km). Not that I'm complaining about getting those miles out of any suspension.
However if you are talking about replacing the springs with full air suspension (bellows) then I won't comment on these as I have no experience here.

Cheers Trevor.

I have polyair's in the rear springs and I think they are great when you load the old rig up

goveroo,

I am looking at the same thing.
They are nothing like the orange polyair that go into coil springs.
They are a rubber bellow that don't have a spring around them and are used to help carry a heavy load on a leaf sprung vehicle.
They can go from 5psi up to 100psi and go between the top of the axle and the chassis rail.
Cost is around the $500 mark, I have not got a set as yet but looking into it.

Wayne

Why not get new springs or if you got leaf springs get them reset,

see the polyair wedsite. they even have prices for each model
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I have the bellows you speak of, and spoke to other on here re them before purchase. Basically they work well. Do a search and you'll find some more info. Actually good for 1100kgs EACH! Totally different to the red ones. I think they improved the ride a little too. Not much change out of $700 I seem to remember. Firestone make them also. Little dearer.
Matt

Thanks all for your replies.
The ones we have looked at are around $700 plus fitting. Not sure whether it would be worth the money or whether we'd be better off to reset springs and add an extra full length helper for around $400 for the rear leaf springs.
We're going to 4wd show this weekend, so we'll see what's on offer there too before making a decision.

Thanks,
goveroo

Have been using polyair in Prado 90 for four years and 120 for one year with no problems and plenty of hard work. Six Simpson crossings, Hay River and plenty of training, Flinders Ranges and South East/Beachport sand. Not sure of correct pressures when used directly with leaf springs but the most common mistake when used with coils is that:
1. You need to pump them up before loading the car then releasing pressure to level the load, front to rear as well as side to side. In this scenario I never go beyond 30 psi and generally drop to around 15-17 psi with the car loaded to 3,200 kgs

2. Most people I have met who have complained about poor ride quaility mistakenly believe that you should run them (in coils remember) at >30 psi. This pressure makes them rock hard and prone to breaking along with other suspension bits
3. When car is unloaded I run around 8 psi to keep them inflated and to prevent rubbing and crimping by the coils.

Overall they are worth the effort and around $400 is about right fitted

Rob