How do I know what size bump stops to buy?

[Hopper]

I have searched the forum over and found alot of great information. I will be learning to cycle my suspension when work slows down. My Jeep is 99 4.0 1.75 BB spacers and 265/75r16. Getting it back today after a regear, S35, lockers and Antirock install.

I need to replace the rusted bump cups and rubber stops.

Finally to the question. How do I know what size stops to buy? Can this be found without cycling the suspension since it has such a small lift?

 

[DWR]

I have searched the forum over and found alot of great information. I will be learning to cycle my suspension when work slows down. My Jeep is 99 4.0 1.75 BB spacers and 265/75r16. Getting it back today after a regear, S35, lockers and Antirock install.
I need to replace the rusted bump cups and rubber stops.
Finally to the question. How do I know what size stops to buy? Can this be found without cycling the suspension since it has such a small lift?

Subbing to this... this will be one of my next projects.

 

[Thunderhead]

I have searched the forum over and found alot of great information. I will be learning to cycle my suspension when work slows down. My Jeep is 99 4.0 1.75 BB spacers and 265/75r16. Getting it back today after a regear, S35, lockers and Antirock install.
I need to replace the rusted bump cups and rubber stops.
Finally to the question. How do I know what size stops to buy? Can this be found without cycling the suspension since it has such a small lift?

Cycling the is the only way to find out how much BS you need.
Your not going to need much, 1 inch maybe ? But you can order and grind down or go cheap hockey pucks.

 

[Chris]

Cycling is indeed the only way you'll find out exactly how much you need. However, being as though you have less than 2" of lift and 265s, I would be shocked if you needed more than 1" of bump stop.

This is all you need:

https://www.amazon.com/dp/B07Q87ZHD4/?tag=wranglerorg-20

Measure them out to the right size, stack them, drill a hole in the middle, and you've got your bump stops. This is what most everyone uses. Cheap and effective.

 

[TrueTexas]

Agreed that cycling is all you need to figure it out. There are some good write-ups in the how to section to help you do this.

With 1.5" of lift and 265/75r16 tires, I needed 1-5/8 of bumpstop extension. But that was entirely due to my choice of shock. The bumpstop height made sure my shock isn't the thing that limits uptravel.

Issue with using hockey pucks is that they are 1" tall. So as long as you only need them in increments of 1", then they are fine.

For your jounce bumpers, use the OEM style, not the polyurethane ones. They need to be able to compress properly to slow down the impact.

 

[Goatman]

I saw somewhere someone makes a jounce bumper that actually works, unlike the yellow foam ones that just compress to nothing. They might be all you need to use. And since you need to replace them anyway it might be a good upgrade. Hopefully someone knows what I'm talking about and will post a link. I'm planning on switching to them but can't seem to remember where to find them.

 

[rasband]

I saw somewhere someone makes a jounce bumper that actually works, unlike the yellow foam ones that just compress to nothing. They might be all you need to use. And since you need to replace them anyway it might be a good upgrade. Hopefully someone knows what I'm talking about and will post a link. I'm planning on switching to them but can't seem to remember where to find them.

Metalcloak has a set https://metalcloak.com/upper-front-durostop-bump-for-the-jk-and-jl-wrangler.html

I think @bobthetj03 knows how far they compress (I think it was down to around 1.8”)

 

[Goatman]

Thanks Rasband. That's the thing. I doubt I could ever have found it on my own. Figured out how to save (bookmark?) that (page?)

 

[bobthetj03]

Metal Cloak's jounces have an effective hard bump to 1.75". The rest of the jounce acts as a poor man's air bump as the accordian portion compresses similar to the factory jounce.

 

[jjvw]

I saw somewhere someone makes a jounce bumper that actually works, unlike the yellow foam ones that just compress to nothing. They might be all you need to use. And since you need to replace them anyway it might be a good upgrade. Hopefully someone knows what I'm talking about and will post a link. I'm planning on switching to them but can't seem to remember where to find them.

What's wrong with the factory jounces?

 

[bobthetj03]

What's wrong with the factory jounces?

They are too soft.

 

[jjvw]

They are too soft.

I never thought that. Since I switched to Currie bumps, mine has less cushion than stock, but I don't feel like I am missing it. Maybe it's the amount of travel.

 

[bobthetj03]

I never thought that. Since I switched to Currie bumps, mine has less cushion than stock, but I don't feel like I am missing it. Maybe it's the amount of travel.

5" of up travel seems sufficient for my tastes. I found the factory jounces so soft that they really didn't do much for harsher events. The MC jounces are a little stiffer, which feels better slowing down the harsher events thru out their compression ratio. All subjective of course, cause it's my butt dyno and no one elses.

 

[mrblaine]

5" of up travel seems sufficient for my tastes. I found the factory jounces so soft that they really didn't do much for harsher events. The MC jounces are a little stiffer, which feels better slowing down the harsher events thru out their compression ratio. All subjective of course, cause it's my butt dyno and no one elses.

Another single point solution. If you are hitting the factory jounce bumpers that hard, then you need to be rethinking your shock selection.

 

[bobthetj03]

Another single point solution. If you are hitting the factory jounce bumpers that hard, then you need to be rethinking your shock selection.

It's a single point solution that agrees with my budget, and gives me better results IMO. I suppose you have a better suggestion for my shock selection, knowing little about my suspension setup?

 

[jjvw]

Are you still using the old OME N66/N67s?

 

[mrblaine]

It's a single point solution that agrees with my budget, and gives me better results IMO. I suppose you have a better suggestion for my shock selection, knowing little about my suspension setup?

Do I need to know what your shock selection is to understand what is going on?

 

[Apparition]

 

[bobthetj03]

Are you still using the old OME N66/N67s?

No.

 

[bobthetj03]

Do I need to know what your shock selection is to understand what is going on?

Likely not.