Spring lift basics

[GATORB8]

This is confusing to me. If you're only lifting the body, or anything for that matter, how could the COG possibly be lower. You're moving weight higher which would necessitate the COG moving upwards as well. Also, axle rotation...how would that be 2" higher at full stiff? None of these methods of lifting increase the height of the axle from the ground, only the body off of the axle. The only way to do that is with larger tires. When you talk about axle rotation, it may go up if the driver side tire stays at the same surface height and the passenger side travels up over a log/bump/rock/hill. But even then, the full travel would be less than the entire lift as the center wouldn't move as much as the extreme ends. Please help me out here...

A bit theoretical since it assumes the spring bind doesn't bump stop. At full articulation, without modified bump stops, the shocks are in the same place and same stroke. So the stuffed tire is in the same locationas stock at full compression and the drooped tire is in the same location as stock at full extension.

With the stops + extensions, the stuffed one is 2" further from the frame, and the drooped one is 2" further from the frame.

Since the axle is basically a line between those two points, it's 2" further from the frame along the whole axle.

Axle ground clearance doesn't change, so the only change would be the frame/body being closer to the axle/ground in the first example. As such, the COG would be lower and the clearance from the ground to the frame mounted components would be closer when fully articulated.

COG and frame clearance would gain the 2" in both lift situations at flat ride height.

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[flanders]

Another option, because you don't need to increase bump, you could find a replacement shock that has a compressed length that works with the factory stop, but gets you more extension. The only real net effect would be increased articulation and added room for droop to keep your shocks from "topping" out.

I just ordered Bilstein 5100s, so I've been looking closely at those, I'll include Fox since it's the go to. Both are IFP monotubes around 2" diameter. Both are available in multiple lengths.

Here's the chart with 2" lift, no bump stop extension.

Both the Bilstein 0-1.5 and Fox 0-1.5 have compressed lengths that work with the factory bumps, but both allow for additional droop due to the stroke being longer. Net gain in front axle articulation angle would be 18% and 33% respectively. The Fox 1.5 with no bump will actually give you more articulation than the Fox 2-3 with the min .5" bump extension you would need.

I keep thinking I'm done adding things to the jeep... then I keep coming back for more.

I'm looking to upgrade my shocks, exactly as GATORB8 suggested. To be clear, 2021 3.6 JLUR, 2" spacer in front 1.5" in back. Winch in front, so basically a 1.5" all around from stock.

I want some Fox 2.0s. I would think I should get the 2-3". But GATORB8 is saying 0-1.5" would give better articulation? It isn't clear to me why I would need a bump stop from the spreadsheet.

Thanks for your help. Basically want to be confident I'm getting the correct size.

 

[dchemphill1]

Don't forget sway bar extensions if you have electric sway bar disengage. Without them they may not work correctly. Considering a spacer lift myself and the research I did said that was a must. This has been an interesting thread...thanks

 

[GATORB8]

I keep thinking I'm done adding things to the jeep... then I keep coming back for more.

I'm looking to upgrade my shocks, exactly as GATORB8 suggested. To be clear, 2021 3.6 JLUR, 2" spacer in front 1.5" in back. Winch in front, so basically a 1.5" all around from stock.

I want some Fox 2.0s. I would think I should get the 2-3". But GATORB8 is saying 0-1.5" would give better articulation? It isn't clear to me why I would need a bump stop from the spreadsheet.

Thanks for your help. Basically want to be confident I'm getting the correct size.

Bump is for tire clearance. If you don’t use the bump, then that reduces your minimum compressed shock length.

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