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2015 Bumper mod

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128K views 58 replies 40 participants last post by  zeake  
#1 · (Edited)
HOW TO: 2015 Bumper mod

I've seen a couple people do this, and I just finished it myself. So if you are wondering how to shim your bumper forward to clear larger tires here it is. Sorry for the crappy pics.

First remove the grille, 12 push rivets on top remove the plastic, then remove the (4) 10mm bolts. Grille just pops off after that, give is a good tug and it will come off.

10mm bolts


Next there are a total of (6) 15mm bolts that need to be taken out, 3 per side. (2) of them can just be loosened so the bumper brace drops down. The (2) that are side by side, the inside one only needs to be loosened.

15mm bolt location behind bumper


15mm outside bolt (looking up)


15mm inside bolts (looking inward)


Next there are (4) 18mm bolts that have to be removed, 2 per side. The top bolts you can see in the first picture, the bottom ones you can see in the second picture. All are removed from the top.

18mm bolt location


18mm bolts looking down at bumper


Once all those are removed the bumper should just pull forward and off.

Now I apologize for not getting pictures of the brackets with the bumper off, I was trying to hurry because it was beginning to rain. So the next pictures are after I installed the spacers and reinstalled the bumper.

There of 2 mounting brackets with (4) bolts each, 1 per side. You will need longer bolts once you shim them, they are 10x1.50 and I used 2 inch bolts to make sure I had enough threads, threaded through. You will need a big washer, at least the size of the one on the factory bolts because there is a huge hole behind the washer so that you can adjust the brackets up/down, left/right. I got the spacers and bolts from NAPA from a tension kit. You may have to ask for them, they had to get them from the back for me. You don't have to get the whole kit, you can get the bolts and spacers individually. Or you can just go to the local hardware store and buy them. My spacers are about 1/2 inch, other have used 5/8 inch spacers, which I may have to switch to. I'll know tomorrow when my tires are installed.

Bolts with spacers attached. Only shows the 2 inside bolts, the outside are under the bumper.

Drivers side


Passenger side


After that you just put everything back together, and you're done. Would have taken me less than an hour if I didn't have to run back to NAPA for the longer bolts. You can use the factory bolts, they will thread, but I didn't feel safe with as short as they where.
 
#41 ·
Do the side bumper brace bolts still line up since you are pushing the bumper forward? Or do they need spacers as well? The three behind the fog lights
 
#43 ·
Thanks. I still ended up putting some washers on the side braces also. You can get by with just forcing them to line up with the bolts but I figured that defeats the purpose of gaining clearance in that area of the bumper.
 
#46 ·
Yeah, I spaced mine as well.

All you have to disconnect is the wiring harness in the middle of the bumper.
 
#44 ·
Did you guys unhook your batterys or leave them hooked up?

Maybe air bag or something?
 
#48 ·
For anyone having issues with tire fitment this bumper mod really helped me. I couldnt clear 35" nittos with stock 20s due to my rancho lift so I ended up ordering borla 1.75" spacers. The spacers solved the clearance of the llift but ran into trouble clearing the front bumper. The tire shop wanted to cut the bumper to make it work but i opted to try the bumper mod first. I cranked up the stock keys 6 turns to net a little over an inch of height in the front and did the bumper mod to move it forwad 5/8" and up about a 1/4". All in all i was able to fit the 35" nittos and only had to trim the plastic valance a bit and push forward to the front of the wheel well liners
 
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#52 ·
I apologize that the pictures are no longer showing up. Unfortunately, I am overseas, and the pictures are all on my computer at home. Sorry for the inconvenience.
 
#53 ·
Since I just did this this morning, figured I would add in a couple new photos since the OP photos are M.I.A in case any one needs them.

Harware I used:

(8) M10 1.50 x 50mm bolts
(8) 1/2" - 13 Bolts for spacers
(16) Thick Fender Washers

Total: $30ish



Note: I took the small washer (frame side) off after a test fit. Fender washer and bolt gave me a good 1/2" ish of spacing and didn't give me gap between the bumper and body when looking down.





All said and done. I also moved the bumper up a smidge.

 
owns 2015 GMC Sierra 2500HD
#58 ·
Does anyone know if there is a limiting factor to the amount of space you add? Will it start to gap between the bumper and grill after 3/4"?
 
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