What's your favorite DIY mod?

My roll cage, it’s something I needed and was fun to figure out what I wanted and what would work. Also fun to build

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My dog will try to get
I can't even grab the keys without him going nuts. If I even whisper the word "Jeep" he goes ballistic and heads for the door waiting for me to tell him he can come along. Sometimes, we just go for an afternoon ride.
A ride from ANYBODY. UPS truck, guy asking directions, even with the LDS when they stop by. As a puppy she would run into the road to stop traffic expecting a ride. Finally broke that habit when she got run over by a Chevy Impala. (The newer ones)

Broke the front bumper and went under both front and rear tires. Got up and walked back to me at the house.
Took a few days to get all the tire rubber of of her side. Could actually see the tire pattern on her.
5 broken ribs and a few chunks of skin missing on her head and legs. Hair never grew back.
Took her to vet next AM. They didn't believe me until they say the tire tread pattern in her side. She was running around and bouncing off the walls. Toughest critter I've ever seen. Now she waits until a vehicle pulls into the driveway.
 
Tailgate table on the outside. Good for going to get gas for the lawn mower, hauling a bag of trash to the dumpster, anything you want to haul, but not inside.View attachment 122265

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👍Definitely going to steal this one.😁 I've been getting ready to buy the one that fits the receiver hitch. They just seem too rickety though.🧐 How much weight do you figure it can hold? Should be at least as much as the spare tire, right?🤓
 
I changed the cables to chains, turned the tray upside down, and drilled all the way through the tailgate so I could put nuts and washers on the back side, so that would be plenty strong, the week point now would be the aluminum tray itself bending in the middle if a heavy load wasn't distributed to the outer edges. I have considered putting a 1/8 steel plate in the bottom if that becomes an issue, but so far it hasn't (except the time I tried to see if it would hold me).
 
I also have the hitch haul, but like you said, it flops around, and if you have stuff on it you can't open the tailgate.
 
My best DIY mods so far haven't been on the Jeep....yet.

-I built a buzzer system on an 88 Mazda pickup to warn me the lights were still on.

-I fixed a broken throttle cable on a Chevy Lumina with $2 in cable and connectors from Home Depot rather than spent the $175 the dealer wanted. It's easy to side the cable through the plastic housing from the throttle end down to the pedal.

- I created a small oscillating circuit with a 555 timer to trick my Toyota Highlander into thinking it was going <5mph so my wife could enter addresses in the GPS while we were driving. I had to interrupt the speed pulse signal to the center console and put the circuit on a switch. Give it 12 volts and it turns it on and feeds it to the car, turn it off it passes the car signal through. If it fails, I set it up so the driver could plug in 2 connections and go on as normal.

- I used gasket maker to make a nice black seal on the trunk handle of our Mini Cooper. So rain would stop filling the battery compartment in the trunk with water. Poor design all around to have a 2 foot long trunk handle/license plate light holder held on by a couple screws and sealed with a foam gasket.

- I had a vacuum line start leaking on me and I fixed it with borrowed fish tank bubbler hose until I could get back from our trip.

I'm sure over time I'll have some Jeep fixes. After I fix the passenger door handle, I plan on making a sealed/lockable storage area in the back.
 
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- I created a small oscillating circuit with a 555 timer to trick my Toyota Highlander into thinking it was going <5mph so my wife could enter addresses in the GPS while we were driving. I had to interrupt the speed pulse signal to the center console and put the circuit on a switch. Give it 12 volts and it turns it on and feeds it to the car, turn it off it passes the car signal through. If it fails, I set it up so the driver could plug in 2 connections and go on as normal.
Damn that's a great idea. Most annoying part of my BRZ for sure.
 
I looked around multiple forums for navigation system overrides. Some used changing the min speed to a high number but that messes with the GPS everytime it loses signal. Mine only did when you flipped the single switch. Then the GPS reset after it turned off. The GPS uses the car's speed to keep estimating location when it loses satellite reception in cities or tunnels. So interrupting it confuses it while you enter data. But it corrects right away when you give it the signal again.

I did something similar to this.

https://www.top4runners.com/ja/2007/navoverride.html

This is the circuit I built, I think. The relay in it was actually the switch maybe. It was 10 years ago.

Falstad Circuit maker
 
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My favorite thus far. Although, it hasn't been completed. Throughout the time spent gathering parts to finish it up, I've found ways to make it an easier build and better overall. So, I'm now planning to jump into another build. Simpler and lighter weight next time. The latching mechanism wasn't put onto this one, but it's a non lock-out indexing plunger.

I used 608 ZZ bearings that have a claimed 308 pound static load capacity per bearing. The bearings are bolted onto 3/8" acrylic, which is bolted onto 2" angled steel, and mounted to the tub using the rear seat's mounting points. The slide-out is welded up using ~1/16" walled 1" square steel tubing. The slide-out frame is topped with 1/2" plywood and covered using an "industrial" type, rubber floor runner from Lowe's.

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Kind of a small, cheap fix, but the plastic grating of the defroster vent had been falling apart (I think the heat and sun from living in Texas so long had got to it), so I just cut out the entire middle section and used some spare plastic gutter screen material along with some epoxy to replace it. Personally, I think it looks better than the way it did when it was in stock form.

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And the finished product:

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I also added a cabin winch switch, which is nothing particularly special, but I found a switch with a cover that lights up when opened that I think looks pretty good.

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