Rear bumpstop options with LT setup (1 Viewer)

[joabmc]

Looking for some advice. Those that are running a LT rear, have you swapped your bumpstops? I currently have Metaltech dual-rate medium coils, OME 6007 1L, Metaltech bumpstop drop, Metaltech RLLs and extended brake lines. I've noticed that the GX OE bumpstop are much bigger (longer) than what was on my FJC. Almost to the point that I want to remove the drop all together.
I'm a little confused by this as the kit is sold the same for both models. There is at least a 2" difference between the FJC and GX style. I'm definitely loosing uptravel with my current setup. Haven't had a chance to really test it on the trail but feel that I have to be catching the bumpstop before I should.

Looking to see what others have done or if switched to an aftermarket bumpstop?

 

[danthemanx07]

Double check me please, but I believe the MetalTech bump stop extensions are designed to be used with 4runner/FJC bumpstops. That is what I am using.

 

[joabmc]

Double check me please, but I believe the MetalTech bump stop extensions are designed to be used with 4runner/FJC bumpstops. That is what I am using.

Yep, you are correct. That's why I'm confused. There is a very noticeable difference between the FJC and GX Bumpstops. I'll try to dig up some pics of them. Has to be at least a 2" difference in length if they were placed side by side.

 

[joabmc]

FJC Bumpstop

GX Bumpstop

The GX IMO is just about as long as the MT extension and FJC bumpstop combined.

 

[joabmc]

Just got a pic of my extensions with OE bumpstops. Almost no room for any uptravel.

 

[GXMac]

I haven't installed my LT kit yet, but I have a set of Wheeler's superbumps to go in the rear. A little pricey at full price, but I bought them in a group buy a while ago and they did not come with brackets so you may be able to get a discount if you don't get brackets.

 

[MGordo]

I used Wheelers bumps and the MT drop bracket. You can order the bumps without their metal bracket if you call which makes them a bit cheaper..

 

[ArBrnSnpr]

I'm dealing with the same issue right now.

I just installed the LT kit from Metaltech with the matching Icon shocks.

I had less than 2" of up travel with the Metaltech drops installed on GX bump stops.

I was hitting my bump stops going over speed bumps at parking lot speeds which was really uncomfortable and sure to perform like a turd on the trail.

I ended up cutting my factory bump stops at the first air pocket (makes the bumps like the FJ bump stops) and I have about 2.5" of up travel now.

It's much better, but still not a sufficient solution.

I plan to measure the compressed length of the shock and make my own extension. I'll probably use Derlin or square tube steel depending on the need.

Installing FJ bump stops might be a solution though.

 

[NMBruce]

with the MetalTech HD LT rear springs, I had about an inch of up travel, but it looks like my shocks couldnt handle much more. I have since gone to Dobisons HD springs and now have about 2-3" of up travel, but I dont bottom out at every speed bump or expansion joint. Also, I estimate I have about 500-600lbs in the back with fridge, bumper, tires and more

 

[joabmc]

Thanks for the replies. Had a good conversation with MT yesterday. Ultimately, regardless of setup, if moving to a LT setup, we should switch bumpstops.
The GX bumpstop was designed to work w/ airbags. That’s why it’s much softer and longer. Designed to rest on the axle when ride is lowered.

I’m going to try and source FJC bumpstops, 4Runner or Prado 120 bumpstops and swap them out.

 

[GXO]

I got the coil jounce and out them in the stock location and welded to frame. Measured it all out and flex tested. Work great.

 

[HomersCanyonero]

@joabmc If I get a 2" bump stop drop bracket like from Apache Offroad, will that work with my stock oem GX470 bump stops? Or am I better off with the 3" bump stop drop bracket from MetalTech and new FJC bump stops?

I'm basically going to run Icon 56550 extended travel rear shocks (17" compressed; 28.5" extended; 11.5" travel) with Dobinson C59-675V rear coils (about 18.5" free height that should give me about a 1.75" lift in the rear) on a MetalTech conversion kit. Extended brake lines and Resz Fab rear offset non-adjustable lower links.

Maybe a better question is for @ArBrnSnpr or @Vlad on how I figure out what's the right distance between the bottom of my bumpstop and the axle?

 

[joabmc]

@HomersCanyonero do you have measurements on the OE? I threw mine out. Only true way to know IMO is to cycle and measure the suspension. We are both compressed at just about the same length so as long as the Apache kit and bumpstop “equal” out to the same length, you should fine. Just don’t want your rear shock bottoming out before the bumpstop catches.
I did take a pic of the FJC bumpstop for reference.

 

[HomersCanyonero]

Thanks for the reply. I still have the OEM bumpstops on, so I’ll measure them soon when I get to the GX470. Most of my long travel parts haven’t arrived yet, so I haven’t installed them.

 

[HomersCanyonero]

If the stock oem bumstops are 4.25” long, then I don’t need drop brackets? Or still need them because of the downward angle being off due to lift?

 

[joabmc]

If the stock oem bumstops are 5” long, then I don’t need drop brackets? Or still need them because of the downward angle being off due to lift?

There is an offset created with the drop system to compensate for geometry changes. Folks have made their own spacers and offsets as well. I’ll dig through my stuff. I know I had pics when I ran this setup on the FJ

 

[HomersCanyonero]

Interesting option to research and see if they work well...

GX470 Off Road Bump Stops 4.25 Inch Tall (2003-2009) DBR425

Durobumps Premium Off Road Bump Stops Proudly Made in the USA for your Lexus GX470 Rear Bump Stop 4.25 inch tall 2010-2023 Rubber Aftermarket DBR425

toyotabumpstops.com

 

[co4wheel]

You don't use the OEM GX bumps. Period. You use the shorter FJ/4R style. I used a Wheeler Superbump. No Superbump extension (cheaper to buy with out it) and a 3.5" extension. Radflo LT. Thats the important specs. I tried 4" (what my measurements said), 3" (too short) 3.5 was just right.

 

[HomersCanyonero]

Thanks for the information. I was under the impression that the rear shocks compression length plus the rear coils height play a role in figuring out what’s the length of the bumpstops (including all brackets and rubber).

Also, an offset may be needed if the lift changes the down-travel arc of the bump stop on full compression and causes the bumpstop to not be centered when hitting the axle.

How did you figure out that 3.5” bumpstop with bracket was the right length for your setup? How did you test it? I want to make sure I get it right

 

[HomersCanyonero]

I went out to measure my stock oem gx470 bumpstops and they measure 4.25” to the tall edge of the bumpstop.

I’m 7.25” from bumpstop bracket on frame to axle. So, the bumpstop rubber is 3” from the axle. This is prior to my long travel rear suspension. Measurements were with tricked air springs that had me at 1.5" rear lift.