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  #1  
Old October 6th, 2015, 18:47
Dragonlich1961 Dragonlich1961 is offline
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Recomended bump stop length

I'm wanting to purchase new bump stops for my rig but i'm unsure of what lenght i need. i have a RC 3" lift with 30 x 9.5 tire on factory rims. i know it's usually one inch more bumpstop for one more inch of suspension. problem is my factory bumpstops are non- existent, so i don't even have a starting lenght to go by.

Any sugestiong on what i should do to get proper stops again, would be helpful Recomended lengths and brands would be helpful.

This is my first jeep and first time having to replace these on any vehicle where the originals were gone. ( my 61 still had it's stops)

Thanks
Chris
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  #2  
Old October 6th, 2015, 18:49
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SuperB60ce SuperB60ce is offline
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Re: Recomended bump stop length

Just get the factory length stops...30in tire will clear with a factory stop Crown makes decent ones and you can buy them from Amazon
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  #3  
Old October 6th, 2015, 18:58
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Johnnie Walker Johnnie Walker is offline
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Re: Recomended bump stop length

I would start with some 4 ring prothane coil inserts with some kind of hard insert so that they do not get stuck on your bump towers.
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Old October 6th, 2015, 19:38
Dragonlich1961 Dragonlich1961 is offline
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Re: Recomended bump stop length

So factory ones would be fine even with the increased height and tire?
What do you mean by 4 ring coil inserts ( could you please post a link or picture)? I'm new to jeeps and still amazed at all the little do-dads people sell.
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  #5  
Old October 6th, 2015, 22:37
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Re: Recomended bump stop length

Google prothane or go to jegs, amazon, etc.
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  #6  
Old October 7th, 2015, 07:32
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Tim_MN Tim_MN is offline
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Re: Recomended bump stop length

The UpCountry optioned XJ's have rear bumpstop that are 4.1 inches long and the stock bumps are about 3 inches long. I just bought some on Amazon. For the front, glue a hockey puck to the bumpstop pad on the top of the axle.
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  #7  
Old October 7th, 2015, 09:32
mtbxj87 mtbxj87 is offline
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Re: Recomended bump stop length

I have extended prothane front stops. Theyre really hard, youll know when you hit bump. Next time I have the spring out im putting a stock bumps and some spacers at the coil base.
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  #8  
Old October 7th, 2015, 14:14
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jrowell jrowell is offline
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Re: Recomended bump stop length

Quote:
Originally Posted by mtbxj87 View Post
I have extended prothane front stops. Theyre really hard, youll know when you hit bump. Next time I have the spring out im putting a stock bumps and some spacers at the coil base.
That does not really make any sense to me. The point of Prothanes are to soften up the bump stop. Mine are like clouds.
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  #9  
Old October 7th, 2015, 15:30
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Re: Recomended bump stop length

Quote:
Originally Posted by mtbxj87 View Post
I have extended prothane front stops. Theyre really hard, youll know when you hit bump. Next time I have the spring out im putting a stock bumps and some spacers at the coil base.

Extended prothane bumps or Prothane coil sprint inserts?

If they don't look like this, you didn't buy the product people are usually talking about.



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  #10  
Old October 7th, 2015, 15:44
mtbxj87 mtbxj87 is offline
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Re: Recomended bump stop length

Nope, I was thinking of the wrong thing sorry. I was thinking of the actual bumpstop
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  #11  
Old October 7th, 2015, 15:45
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Re: Recomended bump stop length

Yeah the extended bumpstops are rock hard. The coil spring inserts are flipping magic.
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  #12  
Old October 7th, 2015, 16:07
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Re: Recomended bump stop length

So, if I go with stock bumpstops and the coil inserts, what size would I need for a 4.5" lift ?

And what keeps the normal bumpstop from getting stuck in the center of the inserts ?
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Old October 7th, 2015, 16:10
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Re: Recomended bump stop length

You have to build a plate, and either replace the upper bumpstop with it, or weld some 1.5" tube to it (3-4" of it) and insert it downward into the bumpstop.

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Old October 7th, 2015, 16:12
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Re: Recomended bump stop length

Not sure I get it......

So you mean I use the inserts and put a plate where the stock bumpstop is now...I assume so the insert has something to 'stop' against,

Or put some tube inside it ?

second part I don't get


I see the plate in your first pic, but I also see a stock bumpstop too......


or just maybe...you meant the plate....with the tube on it.....goes in the insert to hold the plate in place ??
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  #15  
Old October 7th, 2015, 16:19
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Re: Recomended bump stop length

On my jeep we plated the upper and tap'd it, and bolt the plate there.






That plate hits the top of the insert as a contact point (sorry, no good photos).






We cut a piece of 1.5" OD delrin rod to the 'exact' hard bumpstop height and put it inside of the insert. You come down on the prothane, it DRASTICALLY softens any impact (from feet in the air even) and then hard stops when it gets down to the delrin.




Sorry that every picture is from a different iteration of build, or in the case of the last one, randomly stolen from google image search. I didnt really have a photo set of just this process. We used to kinda keep how we did it a secret, but most of the guys we compete against have worked it out by now, so its moot.
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Last edited by cal; October 7th, 2015 at 16:24.
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