Rear Shock pins 2002 TJ

[low ranger]

you cannot use a bumpstop inside a coil spring when using air bags, you would have to fabricate a bump stop outside the coil spring to control bump if that was a problem. less than 5psi in the bags & they will pinch between the coils & be ruined. be careful, these experiments can be costly.

[jonesey19]

Hi Guys , can we keep this debate going? I know my rear suspension settles to 600mm when I lift the body and the tyre is just clear of ground, (this is with shock removed. The shock has an fully extended length of 640mm (40mm to spare?) When the shock is compressed fully by hand that measurement is 400mm . When fitted to the vehicle the shock measures 460mm , with the weight of the jeep on the ground. That means I only have approx 60mm of compression before things turn nasty. (broken shock pins and split bushes etc)
The bump stop is supposed to prevent the shock from doing this. My calculation for extending the standard bump stop would be another 100mm longer ( which happens to be the length of spring lift of 4" /100mm.
I still would like to know what rear spring lift people are running and what bump stop gap they have?
Cheers

[Cornelius]

It's like Mr. Wooders stated. First determine the bump stop needed that will prevent spring bind .........once you have this, then work out what shocks to use. I guess if you already have the shocks and you work out that they will bottom out with the non spring bind bump stop, then you should extend the bump stop even further .......

Originally Posted by jonesey19

Hi Guys , can we keep this debate going? I know my rear suspension settles to 600mm when I lift the body and the tyre is just clear of ground, (this is with shock removed. The shock has an fully extended length of 640mm (40mm to spare?) When the shock is compressed fully by hand that measurement is 400mm . When fitted to the vehicle the shock measures 460mm , with the weight of the jeep on the ground. That means I only have approx 60mm of compression before things turn nasty. (broken shock pins and split bushes etc)
The bump stop is supposed to prevent the shock from doing this. My calculation for extending the standard bump stop would be another 100mm longer ( which happens to be the length of spring lift of 4" /100mm.
I still would like to know what rear spring lift people are running and what bump stop gap they have?
Cheers

[low ranger]

I'm playing with mine presently & i'll let you know what I come up with. the weak link seems to be the too soft, crumbly factory bump stops. I am currently running the rear bump stops from a 200ser landcruiser modded to fit into the jeep cups instead of spacers & factory stops. the rancho 9000's I was using are 610mm long extended. they were bending the cross pin with a 50mm spacer, but that was due to the shitty factory bumps crumbling under hard use. I am using some modded efs shocks off the rear of my commander at 645mm extended with the landcruiser bump stops with great success. there is a lot of tuning left to do & i'll keep you posted with my parts list at the end

[Wooders]

Originally Posted by Redemptioner

Surely there is a "average" for this..

Keep in mind:
1. Different brands of 4" kits ideally need different lengths of bumpstop.
2. Once someone is at 4" they are talking SYE and properly setup that would also include relocated shock mounts.
3. Different shocks - with the same mid length mesurement have more & some have less, compression/extension.
4. Often people in the 4" range do more mods eg - BarPin eliminators, out board shocks or even axle trusses etc that might move the shock positioning

So if you "average" it you run the risk of the same problem.
Why I personally prefer to know the specifics.

[jonesey19]

Thanks guys , I bought the jeep with the work done already and it looks reasonably professional, it has SYE , rear shock bottom relocation extension, control arms, track bar extension etc. I checked the spring length compressed and the bumpstop length is greater (which is ok), so far so good, the shocks are procomp ES9000 with dimensions I have posted earlier. ( i have checked the shock model numbers and they seem to check out give or take 1/2" or so as per website). When back wheel is off the ground the shock has about 40mm travel left before full extension ( good?), but the compressed shock length required would be in the region of 250mm (which I cannot find in shock supplies?)
It seems that I have 50-60mm of compression and 180mm extension movement.
Is this reasonable ignoring the bump stop being too short etc?

[low ranger]

ideally, the shocks should keep the coils trapped at full droop. my coils are loose using the longer shocks so I fitted some retainers to the bottom mounts.