M4X's STX Build

M4X

Tremor Fanatic
Joined
Mar 28, 2021
Messages
127
Reaction Points
362
Location
Texas
Current Ride
'22 Plat Tremor 6.7
Current Ride #2
'22 Rivian R1T
Hey guys, thought I'd share my journey here on my STX build so we can watch what it becomes over time. I was ultimately looking for a 7.4L Godzilla XLT Tremor but unlike the majority of smarter people on this forum I got impatient and decided to settle for an STX Super duty with the 6.7L Diesel as a compromise as I've always wanted one.

So here's what I found:

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2021 XL+STX with the FX4 Package and a few extras included w/ the STX/FX4/Dealer selection:
  • 6.7L Powerstroke w/ 10R140 10-Speed Transmission
  • LT275/70/R18E BSW AT's on the Silver 18's that I think are the same as Tremor minus the black finish and the different hub caps.
  • 3.31 E-Locker (FX4)
  • Power Equipment Group
  • Carpeting and Floor Mats (XL)
  • STX Appearance Package (Chrome Steps/Bumpers/Grille)
  • Skid Plates (Fuel, Transfer Case, Engine [FX4]),
  • Drive Modes [FX4]
  • Cruise Control
  • Engine Block Heater
  • Sync 3
  • Backglass Defrost
  • 110V/400W Outlet
  • Trailer Brake Controller
  • The Base (Power/Heated) Mirrors
  • Upfitter Switches
  • 240AMP ALT
  • 40/20/40 Cloth Seats (Jump Seat)
  • Privacy Glass
  • Dealer installed Tint
  • Dealer installed Paint Sealant (Don't worry I wax over it.)
So it's pretty base as far as a truck goes, but it seems to be similarly equipped to a 2015 F-150 XLT used to have.

Base Sticker was $40,620 + $16,780 Options (most of that is the Diesel), with a total MSRP of $59,095 including destination. Dealer (Autonation) had her listed for around $54k and I got them down a little further from that.
 
First thing I did when I got her home was to lift the steps. I have a 2021 F-150 as well that I just installed N-Fab Rock Rails on so I did not need the OEM steps. So I took the brackets from the steps and switched them out with the Superduty Brackets in order to lift them up:

Before:
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After:
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It does make the truck a little more challenging to enter and if I had a few more years on my bones I may have not done it; however, I enjoy the sensation of stepping up and then sitting DOWN into the truck vs dragging myself up into the seats.

I'll eventually replace these with rock rails w/ removable steps or the Tremor boards.
 
Next up was the air dam and prius catchers. To remove the airdam I simply taped off the top of the airdam with painters tape then followed the tape line w/ a razor blade. It's not perfect but it will do for now until I can get my hands on a shorter one.

Before:
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After:
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My next goal was to boost the breakover, approach, and departure angles just a tad with a very mild 2.5"/2" leveling lift (Readylift 2.5 SST w/ 4" Rear Blocks (vs the stock 2").
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The lift was extremely easy to do both front and rear. The front took me about 3 hours to complete conservatively just really taking my time and shootin' the sh*t w/ a friend. The scariest part by far was moving the brake lines down in the front w/ the relocation brackets. I may get some new lines in the future to give myself some peace of mind.

If you're curious I did not have to rip my garage apart after I lifted it. It got out just fine. :D


After:
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Today I used my Fordpass points to get a run-of-the-mill dealer installed spray-in-bedliner (they warranty the work for life ?‍♂️).

It's not a Line-X, but I think it came out pretty good. My F-150 has the same liner:

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Not really a mod, but I did get a gigantic hail protector since she won't fit in the garage. I live in north Texas and we get car-destroying hail at least once a year, it's just a roll of the dice if it's going to happen or not each year:

These things look silly as hell but they will save your car or truck. I will have to post pictures of what the inside looks like, it's pretty wild.
 
Congrats sir! Strong work and now you can say you built it your way?
 
Most of the mods I have planned for the near future are just aesthetic/quality of life improvements:
  • Leather Steering Wheel from an F-150/XLT/Lariat (I like the softer fake leather.)
  • 35" Tires (Anyone know if the 35x12.50" tires will work w/ the stock rims backspacing/clearance wise?)
  • Possibly some Tremor Wheels (I like the black color and the hub caps that don't require removing to remove the wheels.)
  • Bumper w/ Fog Lights (Probably an eBay takeoff or similar.)
  • Cab Lights (On the fence about these because of leaking issues but I would like to have a set.)
  • Rock Rails w/ Steps or the Tremor Running Boards (they are basically light duty rock rails).
  • DRW Center Light Mod
  • Upgraded Mirrors w/ Paint Matched Caps, Puddle Lights, and Turn Signals
  • Paint Matched Door Handle Bases w/ Paint Matched Handles.
  • Possibly some chrome deletion, not sure.
I'll keep this thread going as time goes on and I get more mods.

Cheers.
 
Last edited:
N-Fab RKR rock rails installed. Removable steps coming for them Monday.

They don't have kick backs but I'm more concerned about catching the edge of a rock on a high center so these will do for me. No tight trails for this bitch.
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N-Fab RKR rock rails installed. Removable steps coming for them Monday.

They don't have kick backs but I'm more concerned about catching the edge of a rock on a high center so these will do for me. No tight trails for this bitch.View attachment 21361View attachment 21362View attachment 21363
Are you going to carry a stepladder for guests to use? The rails look awesome and I started to think about them for myself but then realized I have no idea how I would easily get in and out, let alone someone shorter than 6'.
 
Are you going to carry a stepladder for guests to use? The rails look awesome and I started to think about them for myself but then realized I have no idea how I would easily get in and out, let alone someone shorter than 6'.

The rails are pre-welded for N-Fab RKR removable steps. I have a set of these on the way to throw on it:
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So you can just quickly pull them off when offroading.

Otherwise getting in is ... fun. It's more of a run and jump. ?
 
Removable steps installed.
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I got a set for the rear too but unfortunately N-Fab "measured once" and welded on one of the plates.

Gonna have to exchange the rail or get some washers and a longer bolt for one.

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So it looks just a little awkward with just front steps. But it will have to do for now.
 
Removable steps installed.
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I got a set for the rear too but unfortunately N-Fab "measured once" and welded on one of the plates.

Gonna have to exchange the rail or get some washers and a longer bolt for one.

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So it looks just a little awkward with just front steps. But it will have to do for now.
Is that a 21 F150 in the garage?
 
Yeah a 21 STX FX4 (v8), just like my 250. :)

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Nice. I think there is a lot of value in the STX package. Especially if you are going to tinker with the truck. If I was more capable and lacked other interests that occupied my time, I'd fix up an STX Super Duty.
 
Got the rear steps on today, just had to visit the hardware store for some washers and a longer bolt for the one miswelded plate. You can't see the "custom" bolt w/o getting under the truck so I'm happy about that. I'll krylon the bolt/washers black once a non-windy day comes along. These RKR steps are really perfect level/height/distance from truck for getting in-out quickly/easily. I'm very satisfied with them overall.

And when I take this to moab in a few months i'm just 8 bolts away from having stepless rock rails if I need them.
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Also small touch, but I replaced the factory floor liners with rough countries today as well. I went ahead and got the mats made for the center console/rear storage because I plan to add both. They fit well enough w/ my current jump-seat setup for now.
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