RC 3.25 lift bumpstop extension for 35 tires? - JeepForum.com
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Unread 07-17-2010, 01:26 AM   #1
hoekstbj
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2004 TJ Wrangler 
 
Join Date: Jul 2009
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RC 3.25 lift bumpstop extension for 35 tires?

A month ago I installed a RC 3.25 lift and 1.25 body lift.

Currently the Jeep has 1.5 inch bumpstop extensions with 33 tires and trimmed fender flares. No rubbing

I currently have a set of 35 inch all terrain tires I run on the street but rub when flexing. I would like to run 35 inch tires on the trail. How much bumpstop would be needed? I realize I will sacrifice uptravel but want to keep the jeep low enough for off camber trails.

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2004 TJ Rubicon - 3.25 RC Suspension Lift 1.25 JKS Body Lift JKS Bar Pin Eliminators, 35x12.5x15 KM2's on black steel wheels, D44 axles, Independent Locker Mod, 8,000 lb Ramsey Winch, Safari Snorkel, home-made rear bumper that holds air for Viair 450c on board air system
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Unread 07-17-2010, 10:34 AM   #2
Piratejonh
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I would consider two things Tires and shocks.
You will need to set up your jeep with the 35's and disconnected if you do so. Jack up one end of the axle until it contacts the fender. This may be difficult and dangerous, so think first. Measure the distance between the bump stop and its pad You would need to extend the stop that much plus 1/2 an inch.
Also check the shock piston and make sure it hasn't bottomed out. If it has increase the bump extension lenght until it doesn't bottom out. Shocks are expensive!
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Last edited by Piratejonh; 07-17-2010 at 11:06 AM..
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Unread 07-17-2010, 12:10 PM   #3
TheBoogieman
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I ran the same lift with 35's and ran 2" longer bumpstops with no rubbing.
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Unread 07-17-2010, 12:16 PM   #4
emev0l
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Support your jeep by it's frame, remove your front springs, put a floor jack under your diff and raise it until your shocks bottom out or your tires make contact with the flairs whichever comes first.

Measure how far from your metal bumpstop cup to the pad on the axle. Do not measure from the bottom of the rubber bump stop because it will compress into the cup.

That is how much bump stop you need.

There are other ways to measure for bump stop but this is the most accurate.
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2001 TJ 4.6 Auto 4.5" AEV suspension 35's
2002 TJ 4.0 Manual 3" BDS suspension 33's
1987 Chevy 1 Ton 12" suspension 44's
1970 Cutlass 442 468CID TH400
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Unread 07-17-2010, 10:11 PM   #5
hoekstbj
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thanks for the answers! If I have 1.5 extensions already can I add more at the extension (top) or will it need to be at the bottom (spring perch) ? I've heard hockey pucks work well
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2004 TJ Rubicon - 3.25 RC Suspension Lift 1.25 JKS Body Lift JKS Bar Pin Eliminators, 35x12.5x15 KM2's on black steel wheels, D44 axles, Independent Locker Mod, 8,000 lb Ramsey Winch, Safari Snorkel, home-made rear bumper that holds air for Viair 450c on board air system
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Unread 07-18-2010, 10:11 AM   #6
emev0l
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Quote:
Originally Posted by hoekstbj View Post
thanks for the answers! If I have 1.5 extensions already can I add more at the extension (top) or will it need to be at the bottom (spring perch) ? I've heard hockey pucks work well
If you add to much to the top the bump stop will hit the spring and be off center when it makes contact with the axle.

The best way to do it is to split it between the top and bottom, I've never used a hockey puck but a lot of people do and seem happy with it.
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2001 TJ 4.6 Auto 4.5" AEV suspension 35's
2002 TJ 4.0 Manual 3" BDS suspension 33's
1987 Chevy 1 Ton 12" suspension 44's
1970 Cutlass 442 468CID TH400
1999 7.3 Powerstroke
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rc , rough country , bumpstop , extension , 35 , tires , lift , suspension , tj , wrangler

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