TRD Skid Plate problem - Toyota FJ Cruiser Forum
4x4 / Off-Road Tech This section contains all discussion related to taking the FJ Cruiser in Off-Road situations, 4x4 applications and any armor modifications.

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post #1 of 18 (permalink) Old 08-31-2019, 07:20 PM Thread Starter
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TRD Skid Plate problem

I don't like making these newbie posts but I need help with the TRD skid plate(PTR60-89190) install. I searched around and found some folks having problems with the rear bolts which they solved by tapping the threads. However, I am having a problem with the passenger rear bolt going in at an angle(see pic). I've tried for a few hours uninstalling and reinstalling with the same issue. I had to use two jack stands to help prop the skid plate up..was afraid of it falling on my face. Am I doing something wrong? Has anyone experienced this? I do have a 3" lift with diff drop kit (shop installed). I don't know if the lift/diff drop kit is causing the issue?

Attached picture of the passenger rear bolt. The two front bolts seem to go on just fine. The driver side rear bolt seems to have some resistance, but it is flush. Any guidance is appreciated!
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Last edited by Prius2FJ; 08-31-2019 at 07:25 PM.
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post #2 of 18 (permalink) Old 08-31-2019, 07:28 PM
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Re: TRD Skid Plate problem

That does look askew. I had an issue installing mine as the supplied rear bolts were too long. Had to reuse the rear bolts from the stock plate. They fit fine. I have never seen this before. Keep us posted on your solution.

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post #3 of 18 (permalink) Old 08-31-2019, 08:41 PM
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Re: TRD Skid Plate problem

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Prius2FJ previously said: View Post
I don't like making these newbie posts but I need help with the TRD skid plate(PTR60-89190) install. I searched around and found some folks having problems with the rear bolts which they solved by tapping the threads. However, I am having a problem with the passenger rear bolt going in at an angle(see pic). I've tried for a few hours uninstalling and reinstalling with the same issue. I had to use two jack stands to help prop the skid plate up..was afraid of it falling on my face. Am I doing something wrong? Has anyone experienced this? I do have a 3" lift with diff drop kit (shop installed). I don't know if the lift/diff drop kit is causing the issue?

Attached picture of the passenger rear bolt. The two front bolts seem to go on just fine. The driver side rear bolt seems to have some resistance, but it is flush. Any guidance is appreciated!


Are you using the spacers in the rear?


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post #4 of 18 (permalink) Old 08-31-2019, 09:00 PM Thread Starter
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Re: TRD Skid Plate problem

I don't have any spacers for them.
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post #5 of 18 (permalink) Old 08-31-2019, 10:00 PM
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Re: TRD Skid Plate problem

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I don't have any spacers for them.


Mine (stock) has spacers for the rear bolts (between the skid and the undercarriage).


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post #6 of 18 (permalink) Old 09-01-2019, 12:14 AM
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Re: TRD Skid Plate problem

Regarding the bolt "going in at an angle", there are several possible causes.

First, pull the skid plate off and look at the frame material around the weld nut location. Is it deformed at all, which would put the nut at an angle, and therefore cause the bolt to be at a slight angle when it is properly threaded into the nut (e.g. not cross-threaded)? If the previous skid plate took a solid hit close to the bolt, it could have caused some local deformation around the nut, which "tilted" the nut and now makes the bolt slightly angled.

Does the bolt thread "cleanly" into the nut, without any apparent binding or excess friction?

Are the threads on the bolt in perfect condition, no signs of deformation of any kind?

If there is no deformation around the nut, and a NEW bolt doesn't cleanly thread into the nut without the skid plate present, carefully "chase" the threads in the nut to clean out any debris and re-form the threads into the correct V-profile.

If the nut threads are clean and undeformed, a new bolt should easily thread in by hand.
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post #7 of 18 (permalink) Old 09-01-2019, 10:23 AM Thread Starter
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Re: TRD Skid Plate problem

Thanks for the suggestions. I will need to chase the threads as there was some friction on the rear bolts.

I found a forum post with similar issues on a lifted 4runner. https://www.4runners.com/threads/trd-skid-plate.9532/
Looks like the majority of the people on there are suggesting to remove the diff drop kit.
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post #8 of 18 (permalink) Old 09-01-2019, 01:57 PM
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Re: TRD Skid Plate problem

I had to chase the threads on mine. Even though my FJ is clean, those threads were rusted. The bolts went in find after that.

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post #9 of 18 (permalink) Old 09-01-2019, 10:50 PM
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Re: TRD Skid Plate problem

I installed a TRD skid plate on mine a few weeks ago...I read all the posts about the rear bolts being too long so I went to Home Depot to get some shorter ones to get prepared...in the end I didn't need them. I read that if you have rust or corrosion the bolts might be tight, but can go through as indicated on the skid plate instructions if you persevere. I did lube the bolts up nicely prior to screwing in, with silicone paste...see pic...

TRD Skid Plate problem-img_1649.jpg

Here's 2 sets of alternative screws, from Home Depot if you need them and can't use the long ones that came with the skid plate...
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post #10 of 18 (permalink) Old 09-01-2019, 11:01 PM
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Re: TRD Skid Plate problem

Chase all threads and use Permatex anti-seize paste. Tap and Die sets are cheap and are well worth the money.

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