MadMatt, i really want to give You credit for really trying to explain the basic of how to build a functional undercarriage to a 4x4. Many will only try, and make experience of errors. I like You way of understanding the physical understanding of things. I'm learning a lot from Your knowledge, therefore I'm getting smarter! Thanks!😃👍

was about to buy bushes then decided to youtube first... might save up. thank you for the added confidence and clarity.

Thank you for all your knowledge Matt

Excellent synopsis and explanation! Thank you for posting.

Great video Matt. You explained it in simple terms and gave us some good alternative solutions.

Another awesome vid Matt. Well informed. This is something a lot of people over look when doing a small lift. Keep up the good work 👍

Great explanation! Thanks very much Matt.

The all important caster correction. Fantastic video with easy to understand explanations!!

Another great informative video. I have put castor correction bushes into my radius arms, my 80 series has a 3" lift and I'm using mine mainly for touring.

Nice work matt. We were just recently having this discussion ourselves re the engineering of various components of the steering/ suspension. Caster is important for steering stability and is usually set at around 3 degrees which is a nice balance between predictable and stable handling but without the steering becoming too heavy and cumbersome. For every inch of lift you lose roughly 1.5 degrees of caster angle so you can see that pretty soon once you start going above 2 inches you're going to get into negative caster. Negative caster is not great from a handling perspective unless you correct the caster as your steering becomes over reactive and too light. Quite tiring in fact when driving all but the smoothest roads. Also one of the other lesser known benefits of rolling the diff back to its original orientation is reducing the stress on the propeller shaft and pinion bearings which really don't like operating at steeper angles and are designed to work best when the flange faces are parallel. Incidentally caster can (and should) be corrected in leaf spring vehicles as well by simply adding wedges between the leaf spring and the axle tube. I reckon a lot of people don't think about this when lifting 4wds and probably should so thanks again for raising the subject especially in such a clear and concise manner.

Great explanation and analogies👍🏽

Thanks Matt great information for someone learning about this. 👍

Thanks for this very intuative explanation.

I have 2 inch lift on my 80, no castor correction. Long been thinking of getting it and now I will, because I like good steering. Thanks for the advice Matt!

Welcome to California Matt! I've been a fan of Matt's Off Road for years. Really enjoyed you as a guest there and wanted to ck your InfoChannel..

Matt I agree, the best solution is new arms that provide the needed caster and also provide adequate tie rod clearance.

Very informative! Thanks!

Thank Matt I've put a 2" lift in my 80 & ive notice it's not quite right, even after a wheel alignment. I was told it will be ok but I'm not convinced, so I was looking at the best way as I won't be doing any hard core flexing but still want functionality when I do go wheeling cheers

Awesome Analysis

Matt very useful sir, thank you

Great vid Matt I have never seen any vids from Superior or Jmacx that explain castor correction this well. They might sell might some more radius arms now 😄

Great info 👍👍👍

Hi Matt, love your channel. It would be great if you could do the occasional Q&A video with your mechanical background and love of 4wds. I would have a few questions about my 1979 Hilux.

Loving your videos mate! I went the castor bush route but if money wasn't an issue, then I'd have some superior arms in mine for sure.

Well said! If you are going to change one part...be prepared to change a whole bunch of other ones!

Hi Matt how things I did the bush ones my 80 drive very nice I like the video spot on

thanks for education.

good vid, be good to have a follow up one on ifs vehicles

Comment below with your thoughts on correcting castor. Another video you maybe interested in is Polyurethane vs Rubber Bushes kzfaq.info/get/bejne/bpuqqtKhrJ-pZnk.html were I talk about these 2 common solutions for our 4x4s, but each are horses for courses.

Castor plates can do the same bending of the Tie Rod also. I have them in my 80 , and they touch on full flex. But not enough to do alot of damage. Still my preferred method of castor correction though 👍

I built rallycars and we set up the live axles on rose joints , u could use heavy duty rod ends and they have threaded adjustments and they move left and right and no axle wind up that u get with rubber bushings

Hi Matt. Enjoying the videos here in America. Do you have any videos comparing different types of locker/LSD systems? Or on making do with open diffs and where/how that's alright? Didn't find any but YT doesn't often give the most relevant results, thought I'd check. Would love to hear your thoughts if you have any. Keep up the good work.

Extraordinary video!!! Very informative, but I have one question. What is the factory or correct degrees of an 80 series castor, so I know how much I should drop the control arm with a drop box? I am planing to install 5” suspension so I can put some 37.

New arms are best but if you a pleb like me you got to make a plan. I really like the washer trick.

Love the vid man ... Do I need to castor a 2" lift...besides the highway will it affect off road driving ?

What about the Fortuner rear. I can feel a slight shift . Tried bushes but a new radius arm seems likely

Lovely boss

Matt, I have an OME 2inch(ish) lift on my 78 prado cruiser. Steering is at least ok, but body roll is bad. Does castor correction have any part in side-to-side body roll? I have toyota oem bushings, 'cause I've heard repeatedly that they correction bushings do not last, and I work my suspension hard here in Uganda. On the other hand, I thought the castor plates were for higher lifts, in the 4+ range? I'd rather not do the washer fix, because that locks me in to this ride height and you have to guess right the first time, unless you break out the welder all over again. Advice?

hey matt, I've just put some hyperflex arms on my car that have been set for 2-3 inch. will I have much trouble going up to a 4 inch ?

What about correcting the caster angle with relation to the new pinion angle when you lift your truck? Or what's the solution there? Double cardan?

Help please,does the four link suspension set up can be caster corrected?

Hey mate so if I do the washer mod, how do I spot it bending the tie rod ? Cheers

Great video. If I purchased the castor correct radius will I need castor correction bushing. I think not but asking anyway for a second opinion.

Thanks. I would feel more comfortable with cracked radius arms.

I have a 1998 wrx and having problems with the car veering the left and right when driving straight. Also feels like the car is on roller skates and all over the road. Ive had front lower control arms done, front struts, 3 wheel alignments and balance and still hasnt fixed the problem. Ive now been told that the left castor may be bent and because subaru castors cannot be adjusted and replacing it is so expensive so the mechanic has suggested castor correction mounts. Do you think this will fix the issue of the car terrible tracking or could there be another issue at play here. Also veering hard right when braking as well...thanks

What are the bearings called that will give you a little offset caster ?

Hey Matt my 05 105 Landcruiser wagon has a 3inch lift it hasn't got the return to center damptner only an TJM xgs gold damptner and I'm running the the GXL 8 inch STEEL rims and it drives like a 100 series with s 2inch lift would i need castor corrections or not so far I've had no issues what's your thoughts

Hi mates I need u r suggestion regarding outlander non adjustable casters. A wheel alignment place in the process of fixing crook steering wheel I think they messed up casters. Which made rider hard and bumpy, and I changed the suspension but steering is chambering left and right and and steering return is aggressive even after doing wheel alignment 8 times. Can you please give me u r suggestion. Thanks mate

Excellent video and very informative. Personally, I preferer to go with a bearing kit to correct the castor on lifts up to about 2 or 3 inches, after that I cut-out the welds holding the steering knuckle to the diff housing, then rotate the knuckle back to the desired castor, before rewelding them back in place. It's inexpensive, and eliminates any problems with the diff being out of factory alignment, like torn mounts, bent tie rods, or constantly flogged out uni joints...

Dear Mad Matt, my LC76 has a pulling towards right, I adjusted the arm and the alignment reading for caster is 4 left and 3.9 right. Still its pulling right, I am really dissatisfied and to keep always a pressure for steadiness. Any possible way to fix this issue

every method you mention affects pinion angle --- set pinion angle, then adjust castor by turning the knuckle on the axle housing...its really the only way to correctly set pinion & castor. requires welding & planning, but ultimately is worth the effort.

Hi Matt, great vid. Castor or caster? Here in the US it's caster. Not sure if it is one of those Oz things.

BTW, love your videos and am sorry about your brother. I'll be sure to meet him someday beyond the veil (you can introduce me, we'll have time...)

Greetings matt, which lift is suitable for a bundy, 2 inch or 3 inch?

What about independent suspension....

Now I know way they call him mad matt lol weld on washers weld up old holes thort I was the only one that did that

Mate caster is the last of your problems there. The biggest problem is someone stole the whole top of your car. In a patrol you can also use a spacer at the chassis end to push the arm forward without dropping it down.

First

No care for castor, just wanna see that turbo 1fz go up a mud hill 💦💦 Run drop boxes here. 3inch lift. Drives mint.

If you don't have balanced caster, the vehicle will pull to the side with more.

Thanks for the video but PLEASE stop calling it the covid 80. Im so sick of hearing that word.

Hi! Does this apply to the rear axle too?