Just Installed Drop boxes

[shorty92]

Hi all i have a 92 gq shorty with 35's and 2inch springs i recently installed some drop boxes and it has made a big improvment in the steering and handling but i now have a wobble have had wheels balanced several times now but it still comes and goes around the 80ks would it be that i have 2'' springs and drop boxes since there only for 3'' lift? all bushes have been replaced but before the drop boxes were installed i also noticed that i need to do a wheel alingment would that be causing it?

Any info would be much appreciated

cheers paul

[aidannorris]

mate

i have done much the same, i have put a 3 inch suspension lift on with 33's, i am putting the drop boxes on this weekend and also a heavy duty steering damper. i have been told that with the lift they do get the wobbles a bit, but a new steering damper will fix the problem

i picked up an EFS extreme for $140ish

give it a go and see what happens

[Hoppy11]

How is your draglink, tierods and caster.
My wobble disapeared as soon as new drag link end went on
Hoppy

[lay80n]

Putting on a steering dampener doesnt not fix any problems, it just masks the problem. Get your caster checked, as well checking over all the bushs in the front end for wear.

Layto....

[Hoonz]

check your all your bushes in the front end .. if u put the old ones back in you'll get the wobbles ...

tie rod ends
drag link ends
panhard bushes F+R
radius arm bushes chassis and diff end
also check your king pin bearings ... (take shims out to stiffen them up) will cause more wear but hey its a 4wd and u want to mod it and to drive nice you'll keep the maintence on it i'm sure

and also your wheel bearings ...


that should keep you busy for a while hahaha

[rvh96]

You dont need drop boxs with 2inch lift ,you will have way to much caster especially with 35 inch tyres

[Sandy Rut]

You dont need drop boxs with 2inch lift ,you will have way to much caster especially with 35 inch tyres

X2

[CWBYUP]

You dont need drop boxs with 2inch lift ,you will have way to much caster especially with 35 inch tyres

X2

What differance does 35" tyres make from 33" ?

This is a serious question.

Nick

[JBE]

My understanding of the castor is that it actually not a straight angle measurment, but the distance between the point where the tyre touches the ground and projection point of the kingpin axis on the ground. So, by changing the tyresize, you also change the castor (i.e. bigger tyres increse castor, smaller ones decrease). If you put a 2" lift in, castor decreases which could be almost offset by going from 33" to 35" tyres.

I agree with the above that a 2" lift shouldn't reqire drop boxes.

Hope this makes sense.
Cheers
Joachim

[oondy]

Drop boxes and 2" lift and death wobble.....too much caster angle dude.

Mine did the same thing when I was trying some 60mm coils in the front of my GQ LWB with 3" Drop arms, went back to my 3" coils and wobble gone.

get some spacers or longer coils.

cheers

OONDY

[SuperiorEngineering]

As a manufacturer of drop boxes we do the smallests of any drop box on the market and we recommend that 3 inch be the very lowest lift they go on.
As some of the other replies have stated the larger the tyres the less caster needed ,so you have way to much caster .
if you bought the drop boxes from a shop whatever brand you should take it up with them about a refund as they were incorrectly supplied if you explained what lift you have.
For 2 - 3 inch lifts we use rubber caster bushes as they last longer and flex better than the poly types and they do have a press steel sleeve so they wont rotate.
As a general rule to much caster creates headshake and to little will make the truck wander. Shimmer is different usually a worn bush or tie rod end.

[bushy555]

Whats up with http://www.superiorengineering.com.au/ ?
(it no worky..., for me anyway.)

PM'd...

[bogged]

Whats up with http://www.superiorengineering.com.au/ ?
(it no worky..., for me anyway.)

PM'd...

works for me

[shorty92]

Thanks mate there actually superior boxes lol but i didnt mention the lift i had i know that the castor is over corrcted, every thing else seems ok just wanted to know if castor is over corrected would it cause a wobble ill soon find out cause i just picked up some 3'' springs so ill soon find out being SWB i will now have to sort out the drive line but its all fun and games

cheers paul

As a manufacturer of drop boxes we do the smallests of any drop box on the market and we recommend that 3 inch be the very lowest lift they go on.
As some of the other replies have stated the larger the tyres the less caster needed ,so you have way to much caster .
if you bought the drop boxes from a shop whatever brand you should take it up with them about a refund as they were incorrectly supplied if you explained what lift you have.
For 2 - 3 inch lifts we use rubber caster bushes as they last longer and flex better than the poly types and they do have a press steel sleeve so they wont rotate.
As a general rule to much caster creates headshake and to little will make the truck wander. Shimmer is different usually a worn bush or tie rod end.

[Best1]

Question about how tyre size would affect caster angle, wouldnt the tyre size make no difference at all? Larger tyres would not change the angle between the chassis and diff which seems to be the reason for correcting caster angle, i.e the taller the spring the more caster correction required. Tyre size would not change this?

[fatassgq]

I don't think it is really a matter of "changing the castor angle" with bigger tyres, but more so that the bigger the tyre the less positive castor you need to do the same job. If that makes sense.

[rvh96]

My understanding of the castor is that it actually not a straight angle measurment, but the distance between the point where the tyre touches the ground and projection point of the kingpin axis on the ground. So, by changing the tyresize, you also change the castor (i.e. bigger tyres increse castor, smaller ones decrease). If you put a 2" lift in, castor decreases which could be almost offset by going from 33" to 35" tyres.

I agree with the above that a 2" lift shouldn't reqire drop boxes.

Hope this makes sense.
Cheers
Joachim

this is correct the larger the tyre diameter the greater the projection angle distance this distance needs to be kept the same reguardless of tyre size so fitting a taller tyre you need to reduce caster angle to keep this distance the same this is why passenger cars with smaller wheels run up to 7 deg caster and trucks and 4x4s run as little as 1-2 deg

[shorty92]

Ok so i just installed 3'' springs all good drives much better but wobble still there the onlt thing i havnt done is a wheel alinment hopfully that will fix it if not ill replace pan hard bushes infact i may need an adjustable one tie rod ends are pretty solid same with toe in toe out thingy (steering arm too left wheel

cheers paul

[badger]

mate

i have done much the same, i have put a 3 inch suspension lift on with 33's, i am putting the drop boxes on this weekend and also a heavy duty steering damper. i have been told that with the lift they do get the wobbles a bit, but a new steering damper will fix the problem

i picked up an EFS extreme for $140ish

give it a go and see what happens

if a suspension shop told you this i suggest you go back and jam the dampner is there butts and go see some professionals.

a dampner does not fix anything it just maskes the problem

[oondy]

mate

i have done much the same, i have put a 3 inch suspension lift on with 33's, i am putting the drop boxes on this weekend and also a heavy duty steering damper. i have been told that with the lift they do get the wobbles a bit, but a new steering damper will fix the problem

i picked up an EFS extreme for $140ish

give it a go and see what happens

if a suspension shop told you this i suggest you go back and jam the dampner is there butts and go see some professionals.

a dampner does not fix anything it just maskes the problem

exactly.

Its probly been said before but tiny bits of wear along the whole line of steering components can cause the death wobbles

steering dampers are a good way to mask them, I'm sure thats why 90% of people that run RTC Dampers put them on, apart from the bling factor of course.

best bet is to check and or replace wheel bearings, swivel hub bearings, tie rod ends, new drag link, tighten up the steering box a bees d1ck, panhard bushes blah blah blah. anything and everything can cause them and its usually a combination of everything that fixes them.

have fun

cheers

OONDY

[shorty92]

new pan hard rod with new bushes still the same decided to rotate the wheels then started to do my king pins but heard a clunk and stoped the wobble is now worse what the hell have i done oil is now leaking from the ball joint

cheers paul

[ShaneGQ]

I got my SWB lifted by Superior and she drives like a dream with a 5" lift and 35 MTR's.

[shorty92]

Good on ya mate glad to hear

I got my SWB lifted by Superior and she drives like a dream with a 5" lift and 35 MTR's.

[ShaneGQ]

Good on ya mate glad to hear

No worries Champ. Just thought you might give superior engineering a call and they may help considering I have a bit more of a lift and have had no drama's with the way it drives, thats all. Sorry i did not spell it out.

[shorty92]

Good on ya mate glad to hear

No worries Champ. Just thought you might give superior engineering a call and they may help considering I have a bit more of a lift and have had no drama's with the way it drives, thats all. Sorry i did not spell it out.

Sorry mate just took it as if you were taking the piss but seriously im glad to hear you have 5'' spring and its all sweet you still running the standard shaft?

[shorty92]

ok just finished installing swivel repair kit new bearing i left the shims in for now but so far its all sweet i would have never of thought of those bearing could cause such a wobble

Thanks for all the comments

cheers paul