5th Gen Mods, Install, Off-Road

Body Mount Chop (BMC) Kit for 5th Gen 4Runner

Updated 5/17/20 / Read Time: 6 mins

Body Mount Chop 5th Gen 4Runner

Metal Tech BMC Kit – Step by Step overview on Cutting Body Mounts for the 5th Gen 4Runner

When you make the move to larger tires, you are likely going to need a body mount chop (BMC). There are other areas you need to trim as well, but your body mounts are one of the most important.

Making the jump to 33″ – 34″ tires, or even larger, will mean rubbing throughout your wheel well. After you have trimmed fender liners (also push back), rocker panel caps (valance caps), splash guards, and your actual body, you will need to take your 4Runner in for a body mount chop or do it yourself.

You have a few options for chopping your body mounts. You can do it yourself or take it a shop. You can also use a model-specific kit or use scrap metal to connect your mounts after you chop the ends off. I would recommend using a kit that is specific to your 4Runner, unless you can cut and design your own plate.

The body mounts are awkward to cut so having the right tools for the job will make a big difference. Using a 5″ angle grinder will work, but be prepared to make quite a few cuts before you get a decent amount of the body mount cut off. A plasma cutter might be a better option as you have a little more flexibility in the angle of cut.

Not everyone has a plasma torch sitting around so just know, a grinder will work. I used a 5″ cutting wheel with a battery-powered Milwaukee grinder and was able to cut the mount off just fine.

What Are Body Mounts?

Body Mounts on 5th Gen 4Runner

Body mounts are exactly as they sound; they mount the body to the frame. You often hear the term “body on frame” construction. Our 4Runner has a body and a frame.

The body sits on top of the frame and is mounted in place using these “body mounts”. Inside the body mount is a rubber bushing that helps dampen vibrations which makes the ride for you and your passengers more comfortable.

Body mounts protrude into the wheel well often causing problems for larger tires. Cutting off the tip of the body mount and welding on a new plate is not going to comprise the strength of your frame.

Where to Purchase:

Parts in the Kit

  • 1 Left Body Mount chop plate
  • 1 Right Body Mount chop plate

Recommended Tools:

  • Plasma Cutter
  • Grinder with 5″ cutting disk
  • Grinder with flap disk for blending and sanding
  • Welder
  • Bucket of water and towels
  • Light-colored paint pen or red sharpie
  • Basic hand tools

DIY Body Mount Chop Vs. 4×4 Shop

DIY Body Mount Chop Vs. 4x4 Shop

If you do not weld, use a plasma cutter, or have general experience with a grinder, I would strongly recommend taking your 4Runner to a shop. We have cut off our body mounts, and it’s not difficult. Like everything, it just takes time. Just make sure you are taking the necessary safety precautions; glasses, gloves, facemask, ear protection, etc. After we cut off our mounts, we usually head straight into our local shop and have them weld on new plates. If you cut off your mounts, weld on a new plate as soon as possible. The front body mounts handle the most weight of the 4Runner so you want to make sure you restrengthen the body mounts by welding on a new plate.

Only perform the steps below if you are an experienced fabricator/welder or have enough experience with the tools to accomplish this task. At your local off-road shop or fabrication shop, they will have all the tools you need to get this job done right. The cost for a shop to do a BMC is relatively inexpensive ($100-$250).

Looking for a good shop? 

Stellar Built is a very reputable 4×4 fabrication shop in Greater Sacramento. If you are looking for a good off-road shop, give Stellar Built a call. They are much more of a Toyota shop as opposed to a Jeep shop. Stellar Built has now become our go-to fabrication shop in Sacramento. You can find them on Yelp and Instagram.

Step 1: Jack up Truck & Locate Body Mounts

Step #1: Jack up Truck & Locate Body Mounts

Initial Steps Recommended by Metal Tech 4×4:

  1. Remove battery ground cable from the battery
  2. Remove the front wheels
  3. Remove any installed sliders or aftermarket parts that may be in your way. Allow yourself as much room as possible to work with.

Start by cleaning off your body mounts and then let dry. Lay your body mount chop pieces out and notice the radius corners on the plates. These plates are specific to the driver and passenger side. The side with the radius corner is the top. The flat edge of the plate is the bottom.

Step 2: Remove Rubber Bushing from Mount Housing

Step #2: Remove Rubber Bushing from Mount HousingRubber Bushings

Remove your body mount nut, washer, and bushing. This is to prevent the bushing from catching on fire when you are cutting or welding your body mounts.

Step 3: Mark Cut Lines on Body Mount

Using a light paint pen or sharpie, hold up your BMC kit plates and mark your cut lines.

Step 4: Using Plasma Cutter, make initial Cuts

Step 4: Using Plasma Cutter, make initial Cuts

Using your plasma cutter or tool of choice, make your initial cuts on the body mount.

Step 5: Using Angle Grinder, Grind Ends on Body Mounts

Using your paint pen or sharpie again, mark your locations to grind down to. Using your angle grinder or tool of choice, grind down your body mounts so you have a flat edge.

Step 6: Weld Plates to 4Runner Mounts

Step 6: Weld Body Mount Kit to 4Runner Mounts

Weld the driver/ passenger-specific plates to your body mounts. Make sure your radius corners are facing up and the flat edge is facing towards the ground.

Step 7: Flat Black Spray your Body Mounts

Step 7: Flat Black Spray your Body Mounts

You can use flat black spray paint to paint your body mounts. This will give the end result a cleaner, more factory appearance.

Body Mount – Driver

Body Mount Chop - Driver

Body Mount – Passenger

Body Mount - Passenger

If you are looking for more clearance around your tires, this a great kit that is specifically made for our 4Runner. To sum up the install, it is fairly straight-forward. Metal Tech 4×4 provides a detailed step by step installation sheet that you can refer to if you have any questions.

Your options here are simple, do it yourself or grab a kit and have someone else do it. It may sound crazy to pay someone else to cut metal off your truck, but if you don’t know what you’re doing, you can make mistakes.

After owning three 5th gens, I have cut the body mounts off and paid to have it done as well. Sometimes I think its easier to just pay someone to do it but it depends on your skill level, time and budget.

I personally recommend having a professional get it done but to each their own.

Questions or Comments? Leave them below!

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Ian Sioux
Ian Sioux
September 9, 2020 7:35 pm

I went with the Limited 5th gen, 2020 to be exact. Will this same BMC work on it as well? I do plan to remove the XREAS for my 6112/5160.

—@Kirby, voiding a warranty in full to my knowledge is unlikely in most scenarios. Whatever your warranty covers, it should cover everything it does not effect. For instance, removing my XREAS only voids the warranty for the XREAS & anything that it is connected to. & I am still researching what it could be touching (if anyone has any experience with that).

May 4, 2020 1:30 pm

think it’s pretty weird that you’re posting guides to do something you didn’t actually do yourself and dont have the skills to do. Kind of the tone on this whole site, I’ve noticed. “here’s how to do something. I didn’t actually do it and have no experience with it, but here’s a step by step guide I wrote anyway!” “Here’s some tires I think you should buy. I’ve never actually driven offroad on them, but they’re great offroad, I swear!”

Troy Carter
Troy Carter
February 17, 2020 7:31 pm

Will this kit allow to fit 35s? I have a 3 inch suspension + 1 inch body lift. Thank y’all.

October 8, 2019 6:39 pm

Will this void my warranty?

March 18, 2019 2:54 pm

I searched for the kit that was linked in the readings and opted to go with this one from the same company. https://www.metaltech4x4.com/metal-tech-2014-4runner-body-mount-chop-kit/ Check it out. It leaves the body mount looking as close to stock as can be but also removes the the rubbing for the bigger tires. Just trace it on paper. Take the paper cut out and and trace it onto the body mount then with a grinder cut along the trace. Put the mod component and check fitment. Make any more modifications and then tack weld. I read that a lot of people prefer the staple… Read more »

December 27, 2018 5:05 am

Oh and with 2.5” Bilstein 5100 lift with Wheelers T1/T13 springs front and back and JBA ucas, on 285/70/17 Falken Wildpeaks and SCS Ray 10 wheels, 17×8.5 -10 mm offset I’m rubbing the bmc on full reverse lock out. Looking at just doing the kit instead of chasing around castor and alignment.

December 27, 2018 5:33 am
Reply to  Ty

I just checked again, there is a kit for 2014-current available so make sure you order the correct kit. I didn’t know the body mount changed on the Gen 5 after 2014?

October 8, 2019 6:49 pm

I ordered the wrong ones as well and have my chop scheduled for tomorrow….do they work? I have a 19. I can get rid of th ones I ordered and reschedule if not

December 27, 2018 5:02 am

The metal tech kit says it fits 2010-13 4Runners, but I’m assuming this same kit will fit newer models as well? Your link to the kit is the 10-13 model.

Blake purcell
Blake purcell
November 16, 2018 12:38 pm

General red letter grabbers the old school ones. On 17 inch methods. Still rub a little at full lock. I didn’t know I could cut that longer part back. Great advice.

Blake Purcell
Blake Purcell
November 15, 2018 7:29 pm

Great idea. I cut mine but still need to trim more. I will follow your guide to trim the remainder off. I was still able to stuff 35s under there

October 16, 2018 3:37 pm

Thank you Brenan! I live near you so that will be no problem. I’m in Cameron Park.

October 15, 2018 11:31 pm

Hi Brenan,
Who did the cut and weld for your kit? I got my kit but need it installed.

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