Castor correction advice please

[MudRunnerTD]

Southwest Western Australia

Yeah ok, really any Suspension Specialist. Not really an ARB or alike, rather someone like Pedders?

Google search found this guy?

https://southwestauto.com.au/suspension/

but chase someone that specialises in suspension and steering.

[timbo2410]

Ok got some figures here:
Final Values:
Left = +0.22 degrees
Right = +0.53 degrees
Should be +3.5 degrees for both
So there ya have it ... Just a quick note .. the "2inch" lift by Ironman has a suggested end figure (total lift) of "BETWEEN" 50 and 75mm ..... just read it on the little note on the receipt ...

[timbo2410]

and just to give you an idea, I called our local Opposite Lock centre and to install "rubber" bush castor correction kit front and rear it will be $505 fitted. They say do NOT got for a 3 degree kit .. 2 degree will be enough. His explanation of what I have was superb .. the inability to drive with one hand on the wheel and the other resting on the window .... couldn't have put it better ..

[timbo2410]

And a few quick prices:
Local tyre and muffler centre: $400 but with polyurethane Old Man Emu that are 2 degrees
Local truck alignment centre: $375 but with polyurethane bushes that are 2.5 degrees

So the choices (if I want rubber) are from ARB but it will be 2 degree kit and get it fitted elsewhere
or a 2.5 degree kit but it will be polyurethane

Does the rear axle require any changes?

[Bidja]

Few points to consider, if you do the correction in line with your result(assuming to be accurate):

Left = +0.22 degrees
Right = +0.53 degrees
Should be +3.5 degrees for both

How old are your 2" lift coils (allow for sag over time). Is weight to remain same(bars/winch, drawes / load in back) etc.

Yes 2.5-3 deg would be correct based on result but IMO 2-2.5deg be OK, but your choice based on material selection. $375-400 looks OK, ask if it includes alignment check after fitting bushes. Maybe offer to supply the bushes to chosen installer if they do not carry them.
IMO, if she drove well before lift and you lifted 2", I would do 2 deg caster correction. Based on general rule 1 deg correction per inch of lift.

Rear axle is fine, only thing is make sure the brake lines can cope with drop of axles(front and rear). At least jack up each corner of chassis to achieve full extended shock length(whl off the ground) and make sure there is some slack in the flex brake hose/line. Most lift kits (eg: Dobinsons coils) come with spacer blocks to accommodate for lift. Ask the guys that supplied/fitted your coils.

The brake proportioning valve (lever/spring 90 deg position), might be OK. Do a search on topic.

[timbo2410]

The coils were fitted last October but I suspect that the heavier duty springs have a slightly higher lift than 2 inches and hence the more pronounced castor issue. I was advised not to go higher than 2 degrees (by ARB centre) and that coupled with the fact that they do the 2 degree kit made of rubber then I am inclined to buy the kit from them and get it fitted elsewhere like you said. The local truck alignment centre said flat out .. an hours work .. everywhere else has said 3 hours. Of course that's where the money lies in the total price. None of these prices were with any wheel alignment either. As the alignment was done in October and there doesn't appear to be anything wrong with it now, they have said not to bother doing one. If it does need to be done then put $88 on top.
I will certainly check out the brake lines along with the proportional valve. I did comment (prior to you guys mentioning it), that I had to hit the brakes recently and the wagon was very nose heavy .. probably the reason why.

[Bidja]

Spring rate refers to the amount of weight that is needed to compress a spring one inch. If the coil is rated 2" lift, be surprised if you gained more than 2" above stock within spec.
Alignment post fitting bushes was only to check the corrected caster. Sounds like U are sorted.

Did my 2" lift 5 yrs ago, did not change the Brake Positing Valve bracket to suit as had no real issues with nose diving. Maybe I just have not given the job much priority.....

[timbo2410]

that's just it though .. the heaviest 2 inch lift coils from Ironman come with the label 50 to 75mm .. so if it is on the higher side then that may be what is causing the issue. If it were just the 50mm then I might have been able to get away with it like others have. I was warned they would settle after a bit of use .. 10000 k's later and I dont think they are going to settle any more .. yeah I think the alignment is fine. Everything else is a non issue. No pulling left or right, no wobbles or vibration, steering wheel is centred ..

[timbo2410]

Well the good news is, I don't seem to have a brake proportional valve that is spring loaded or on a bracket .. mine appears to be controlled by the ABS ...

[Ben-e-boy]

and just to give you an idea, I called our local Opposite Lock centre and to install "rubber" bush castor correction kit front and rear it will be $505 fitted. They say do NOT got for a 3 degree kit .. 2 degree will be enough. His explanation of what I have was superb .. the inability to drive with one hand on the wheel and the other resting on the window .... couldn't have put it better ..

If you only have .2 and .5 degree of castor. 2 degrees will still put you out of tolerance. That is shit advice given by a 'Professional' You are still going to have adverse effects because your castor will still be out by 1 degree. Or 100% out of spec.