JB74 40mm OR 50mm LIFT WHAT SHOULD I DO OR NOT DO ?

Hi All after being politely put in my place over free wheel hubs which perhaps i should have asked here,i have a new bunch or questions on what i should or should not do re lifting the jb74.
I have managed to get a second hand OME kit that has only done about 5k and in good condition ,as off yet i have not installed it i think the lift looks pretty good but do i need it as i will not be doing much off roading ?
1 First off all there is the issue off the jimny i call it the( mini hummer) as is reminds me off a hummer moving left and right on a windy day at speed also if you push on the roof it seems rather springy after seeing a number off videos including Martins a lift with bigger springs seems to stabilize this problem,.also re the steering damper will this help up grading to a more positive type or is this replacement more for off road use.
2 Re the brake hose extension some seem to use this, some dont, OME use a brake extension bracket to get over this problem not a brake hose extension.
3 Re Castor correction Bushes OME supply castor correction bushes to be installed with their lift where as in Matins video unless i missed something there is no mention off castor correction bushes, my lift is 40mm where as his is 50mm
4 Re Panhard Alignment Bracket kit OME supply this, some dont again referring to Martins video there is no mention off this.
5 Re wheel alignment some mention to do this some dont is this more critical when putting bigger tyres on or is it common sense
to do a wheel alignment.
Please note im not trying to have a dig at martin in fact i found his video to be very informative and at the wright pace out off most i have viewed on you tube.
Look forward to replys and have a happy new year

Martin do not have OME installed.

Aftermarket lift kits differ from manufacturer.
Some inlude caster correction bushes, others not. Some include panhard bracket others not. Some include longer brake lines others not. And so the list can go on and on.

Martins video is based on what he installed.

The following is not mandatory for a 40/50mm lift.
- caster correction bushes
- panhard adjustment bracet.

I have had 50mm lift on both gen 3 (3 years) and now on gen4 and both do not have caster correction bushes and panhard bracket. On gen4 i do intent to add them though later.

BUT

it is always best to try and have complete setup e.g. add castor correction bushes, add panhard relocation bracket etc etc dependable on how deep your pockets are, but each manufacturer decide what they include in their base lift kits that is still regarded as a safe upgrade.

Edit.
Gen4 already have steering damper std from the factory.
Gen3 did not come with steering damper.

No problem on questioning the video, thats what they are there for and you see my mistakes and issues when doing them.

As was just said, the Gen4 has a steering damper fitted as standard whilst the Gen3 didnt, this really points to it not being particularly essential on a new car, as it has one there is nothing to do there.

I installed the kit exactly as it comes to reflect what anyone else would experience. I have put a number of 50mm kits on Jimnys (both gen3 and gen4) and noted the following purely based on the kit I sell:

1. This kit does not need castor correction, the lift is not big enough to throw the castor out to an unacceptable level.
2. This kit do not need Panhard Rod correction, again because they are not big enough to throw it too far out.
3. For this kit, only the rear brake hoses need replacement.
4. For this kit, wheel alignment does not seem necessary. The two front wheels are not moving in relationship to each other as the axle is solid. The only bit that changes anything is the link from the steering bar to the front wheel, but this pulls both wheels in a similar fashion (see next point)
5. Steering wheel alignment, some people have reported the steering wheel rotated. A simple adjustment of the steering bar corrects this.

However, this varies depending on each different kit. No 50mm kit is the same as another 50mm kit. The Trailmaster that I sell is slightly below 50mm so it does not seem to need any correction. Some are slightly above 50mm and need correction and, indeed, a cross-member drop kit. At least one 50mm kit I have seen for a Gen3 is over 75mm in reality, some kits are just shocks and springs thrown together without much design thought. The same goes for why some need brake lines and others don't, different kits have different levels of flex, which may or may not need longer brake lines.

Trying to compare kits is a difficult task as they are all slightly different, the OME kit may well need these extra corrections as perhaps it is slightly higher than 50mm or creates a different geometry in the suspension. You should follow the recommendations/parts needed for the kit you have and only use my video as a general guide as to the principle behind installation.

You should find it pretty straight forward to fit. As you have a used kit make sure you have all the parts relevant to that kit.

I have a Gen.4 with Martins lift kit fitted so this is straight from the horses mouth.

I would always prefer that a lift kit is supplied with suitable extended brake hoses and a means to reset the headlamp beam adjustment by supplying a longer bracket. Martins kit does this.

Caster angle is not a definitive figure but is usually 4 degrees plus or minus 1 degree. This is to allow for variations in the construction of the vehicle. Raising the vehicle by 40-50 mm will reduce the caster by maybe 1-1.5 degrees. This figure will depend on the length of the trailing arm. The longer the arm, the less the change. As the caster angle approaches zero, so the steering becomes less precise and the vehicle will start to wonder. Go beyond zero to a positive figure and the vehicle will be uncontrollable.

If when you have fitted the kit you experience steering vagueness or a desire to change course abruptly when you hit a pothole or similar then a steering geometry check would likely be a good idea.

The standard dampers are a compromise between a soft compliant ride and a controlled one. They succeed - just - with the first, but fail with the latter. Martins kit stiffens up the ride and succeeds in controlling it at the same time. Short wheelbase allied to a tall lightweight vehicle is a proven recipe for a bouncy vehicle at the best of times. If you want to experience ride quality at it's best, try a stretch limo.

I hope this gives you an idea of what to expect when you raise your motor but one thing that is not mentioned is that you must slacken off the bolts that mount the arms to the chassis and ditto the panhard rod bolts, both ends. When the lift is complete bounce the motor a few times and then retorque the bolts. Failure to do this results in you placing the various rubber bushes in unnecessary tension and will reduce their life span.

Roger

Thanks for the feed back guys
Have a happy new year

Can anyone who has had and OME lift to their jb74 2019 onwards please reply to this posting as i would like some feed back re the rear end suspension lift especially in relation to the extended brake line bracket installation whether they had this installed or not installed or even had a extended brake hose fitted as most diiferent lifts seem to if you have photos it would help if you can post i have seen a number off video re ome lifts but nothing closly showing the brake line extension bracket install please see photos