Outer Limits 4x4 Board

Just picked up some dobinson 4" coils for me lwb GQ today.
At the moment i have been running 2" coils and 2" coil spacers and 2 or 3 degree castor bushes - with no vibrations.

The 4" coils go in on the weekend and was wondering, if i get vibrations what is everybody else running to get rid of them and why?

Castor corection plates?

Drop arms?

Drop boxes?

if you have 2" coil n 2" spacer you have 4" lift already so should be the same

have the feeling the old springs might have saged a tad. I do expect to gain at least 1" of the setup thats in now.

drop boxes

For the front. Drop boxes best. Castor correction plates 2nd best.
For the rear. Adjustable lower trailing arms. Make sure your brake lines are long enough and that you have spaced out your bumps stops. You will also need longer sway bar link pins. If you want prices just ask.

Shane

in lwb only vibration should be in front shaft at 80km or higherm in 4H, if you have one in rear shaft replace the uni's. Drop boxes do not fix vibrations. You dont need adjusable lowwers either for lwb

even with my 7 inch coils i had, i never once got any driveline vibes even at 100 in 4h on the beach.

that was with 4 inch drop boxes and no other castor correction

i now run 5 inch coils with drop boxes and 20mm longer rear arms and it drives beautiful.
the rear arms are well worth it

If you can explain how drop boxes fix vibration n not just caster I'm listening, cos any caster correction will do the same thing for vibration as th diff orientation is the same they just drive better

If you fix the castor you fix the vibes on the front. Drop boxes are best because they keep the arms as level as possible reducing bump steer. They also give you more flex. Another point is castor plates are really a bit too much castor correction for a 4 inch lift but it does the job. Castor plates are heaps cheaper though. The drop boxes do drop down giving a possible place to get hung up.

The Dobinsons coils are usually a big 4 inch lift. Even if there isn't vibes coming from the rear your uni's would be wearing quicker. There are other reasons for adjustable lower trailing arms.
If you keep your original arms then the diff is pulled vertically upwards. In doing this your coils also bow a bit putting more pressure on one side of the coil and the chances are you could get premature spring sag and it doesn't sag evenly.
Also if you do go wheeling the higher your lift is the more your lower trailing arms are exposed. Most aftermarket lower trailing arms are heaps tougher then original.

I would suggest some adjustable panhard rods front and rear also. Again you can get coil bow to the side plus all your bushes in the suspension are pulled to one side giving premature wear.

Don't forget there are heaps of other reasons for vibrations and it can be very hard to track it down. Changing the suspension geometry often exagerates an existing problem. There are threads about this.

When doing your lift. One way to test vibes is to remove front tail shaft and go for a drive and then do the same for the rear.


Shane

2 - 3 degree castor bushes will be fine for a 4 inch lift.

LudaCris

have decided if i run into any vibe problems to go the drop boxes. Can anyone give us some prices?

$379 including freight for the drop boxes.

Do they do these for a 2 " lift ?

Cheers

No, just stick with offset bushes. Can get rubber ones these days.

Hey 4wd stuff, where can i find rubber castor correction bushes?, cheers, I like the sound of that...

what about a 3" ??

already got my castor corrected, im just curious thats all

ludacris wrote:2 - 3 degree castor bushes will be fine for a 4 inch lift.

Would you use these things on your own vehicle?

Yes you can get drop boxes for the 3" lift also but I would have to confirm the price as I have never sold them before but I can get them.

Rubber castor correction bushes are $179 including freight and you can get them from me. They are a 2 degree correction. You can get 3 degree in the poly for $105.

I know peddars have rubber castor correction bushes but I have not seen them. I think I heard they wern't very good but I'm not 100% sure on that.

pm sent 4wd Stuff

I have never had vibrations from my 4"lift, but i fitted dropped radius arms at the time.

New product that is just out is dropped trailing arms, they are lengthen by 300mm so you need to cut some brackets off a wreck or you can get new ones from me and weld them on, you will need an oxy also.

They will improve on and off road performance by heaps. You will start seeing the comp guys using them as it catches on.

They will suit standard suspension to 8" plus lift.

Rough Price for now, (I will edit this if I need to) is $385 for the pair of arms with Nissan bushes and $395 for the new brackets if you can't or won't cut some off a wreck.

What do you think Buddha?

Shane

ps 3" drop boxes that are weld and bolt on are $250. Disclaimer here is that I personally haven't tried these to know if the castor is better set up for the 3" lift than the bolt on kits.
Bolt on boxes would do however the castor would be out by nearly an inch so it would be like driving a standard rig with 1" sagged coils.

by dropped trial arms do you mean banana rear arm, will it be a full kit or lowwers only, pics would be good.
Cheers Steve

My Drop arms are only $550 and I build the arms to suit 3", 4" 5" and 6" lifts.

cheers

OONDY

I think he just means they would just be 300mm longer lower arms and the lower trailing arm brackets welded on further down the chassis ?

Theres some differences in SWB/LWB though....?!?!?!11

or im talking trash and he means 300 mm longer front arms.

JemmyBubbles you have it right.
Dropping the place where your arms attatch to the chassis is the biggest benefit in my opinion then the longer arms by 300mm top it off. The reason why the lifted GQ doesn't ride as nice as stock is because the trailing and leading arms and panhard rods are all on an angle. Straighten or level them up (as much as practical) and you get your good ride except for the effect of the larger tyres and higher centre of gravity.

pics will come soon.

4wd stuff are your talking about a superior engineering long arm kit?

Yes

i was down there chatting to mick about this the other day.
looks great and works awesome.
id so be there if i haddnt just built my 20mm longer rear arms and modded a few other bits to suit my setup

I run 4" springs and added 30mm spacers and have never had vibration in 2wd. If i leave hubs in it has a bit of vibration along highway. I have fitted castor bushes and they're crap as they crack and spin if you play off road. looking at drop boxes heaps better and helps to space diff forward a bit too.