If you're going to go with Rancho or most other brands, avoid the cheapest in the lineup.
The Rancho RS5000 are junk. In contrast, the RS9000 were the best shocks that I've ever had on any vehicle
Well, you can do exactly the opposite. Remove the transfer case motor, (leave it hooked up to the electrical connection) Then have someone move the switch and see if the motor moves.
1. Get a different mechanic. Although he found something that was broken, he should have known that it wouldn't have caused a grinding noise. (it would possibly have cause a knocking or banging when hitting bumps, but not grinding)
2. Did the mechanic bother to check the brakes, wheel hubs...
Old hot rodders used to use stuff like that in high compression or blown applications to reduce knock and ping. Modern computer controlled engines won't benefit from it all.
Now, if you have an 11 to 1 big block in your truck, then go for it.
If your signals are flashing rapidly, you're far better getting a 'zero load' electronic flasher module, rather than using a resistor to fix it. (The resistors get hot)
Pretty sure that this is the one for your truck
EP27L LED Bulb Electronic Flasher | Flashers & Load Resistors | Car Bulb...
When I picked up my edge programmer, I picked up an mpg or two.
But the main reason that I got it was to improve the shifting to save the trans from wear.
You would have to drive a lot of miles to pay off the programmer if you just bought it for the mpg increase.
Use an adhesion promoter (most auto parts stores have it) after you give it a light scuff. Then, prime, paint and clear coat and it should last a long time.
Dupli-Color :: Adhesion Promoter
If you don't use this stuff, chances are that the paint will flake off.
If the inside of the brake fluid reservoir is clean and full of fluid, the coupler / master cylinder is probably ok. You should feel the trailer brakes come on when backing the trailer uphill.
The toughest part of changing over the coupler is breaking loose the brake lines without damaging...
Since you never mentioned exactly which plugs you put in, have you gone online and double checked the application? Autolite says that it's an HT15
Part Details
If one NAPA store has the wrong listing, then it would just follow that the other one would too.
I'd also do a compression test to make sure that the pistons, rings or valves aren't damaged. The steel of the spark plug is much stronger than the aluminum piston, so if they made contact... it ain't good.
Fortunately, those rear trailing arms are a very basic design. Anyone with basic welding skills can easily fab up a set with some DOM tubing and some Energy Suspension leaf spring bushings.
If you are going over 6" on the suspension lift, you may need to have the driveshaft modified / replaced...
Ours does that too. Although I will say that it banged a lot more before we replaced the coupler. It was worn out and rusty inside of the brake fluid reservoir.
Going with a decent rotor like above and adding good quality ceramic pads to the truck is the only affordable way to upgrade the brakes.
Big brake kits for the Expedition / F150 easily cost $2500 to $3500 minimum.
The dust shield, shouldn't be holding the rotor on.
Most likely, the rotor is rusted on to the hub and someone tried hitting it with a hammer and bent the dust shield.
Some PB Blaster around the stud holes, perhaps some heat and a bunch of hard hits on the hub face with a decent size hammer...
I think people make way too much fuss about 'custom' tunes. In reality, unless your setup is radically different from the normal mods, you really don't need to spend the time and money on a custom tune.
Let's face it, most of us have basically the same setup. A cold air intake, perhaps...
....Especially since you won't be running 'locked in' in 4wd on dry roads.
I would imagine that the actual difference in diameter of the old and new tires is actually pretty small.
The Expedition has great suspension geometry, unlike those Jeeps.
If you're getting true death wobble, then SOMETHING is worn out in that suspension. I'd also have them double check the balance on those new tires.
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