KYB 344085 Excel-G Shock Absorber: A Buyer's List for Common Repairs

If you run an independent shop, the KYB 344085 Excel-G shock absorber is the closest thing to a no-brainer for stock replacement suspension. In our shop, warranty claims on suspension work dropped from 5.2% in 2022 to 1.1% in 2024 after we standardized on Excel-G for the applications it covers. I want to say that's the exact number, but I'm going off our repair orders, so don't quote me on the decimal. The trend is what matters.

I'm not a mechanic. I'm the office administrator for a 12-person independent repair shop, and I manage all parts ordering—roughly $240,000 annually across 8 vendors. I report to both operations and finance. When I took over purchasing in 2020, I had exactly one rule: never make the techs wait. That led to some expensive mistakes, and it's why I write this list the way I do. After five years of managing these relationships, I've learned that consistency beats urgency almost every time.

What most people don't realize is that OE replacement doesn't always mean the same valving as the original shock. It means it fits. Sometimes it also means it feels close, but not always. The KYB 344085 Excel-G shock absorber has been one of the close ones. We order it for stock-height cars and trucks, and the ride complaints we get back are rare.

Why I Trust the KYB 344085 Excel-G Shock Absorber

We standardize on the KYB 344085 Excel-G shock absorber for stock-height replacements. What I mean is, for vehicles that are still at factory ride height. If a customer has a 2-inch lift or modified springs, we're in a different part catalog.

The 344085 is a twin-tube gas shock. That isn't flashy, and that's the point. Most drivers aren't looking for a track-ready shock; they want the car to stop bouncing and to handle like it did when it was new. The Excel-G line is KYB's standard replacement series, and KYB is one of those manufacturers that has supplied OE suspension parts to automakers for decades. So with most cars, you're getting a part that came out of the same factory culture, not a one-size-fits-all contraption.

You don't get credit for hoping a part number probably fits. The part number isn't a suggestion. It's the contract.

Before ordering, I check the KYB application catalog. I can't tell you every fitment from memory, and neither should you. I've ordered the right shock by number and still had to send it back because I missed the AWD vs. FWD difference. That was a $38 return shipping lesson.

One more thing: if you're replacing a shock or strut, order the KYB strut boot at the same time. The boot is cheap, and it's the part that keeps water and junk off the shaft. I used to skip it because the shock is sealed anyway. That was wrong. A pitted shaft will wipe out the seal, and then you're doing the job again. Oh, and get the bump stop too if the kit calls for it.

KYB Strut Boot: The Part That Pays for Itself

The KYB strut boot is one of those $10–$20 insurance policies that people ignore. It doesn't seem important until the strut rod gets sandblasted by road grit and starts leaking. Put another way: it's not a glamour part, but it's the part that makes the shock live to its normal lifespan.

In our 2024 vendor consolidation project, I cut down our suspension parts suppliers from three to one. The first time I ordered boots by the case, our techs thought I had lost my mind. But now we never start a strut job without one. This was true 10 years ago, and it's still true today: a new strut with an old boot is a comeback waiting to happen.

Throttle Body EFI: It's Not Always a Cleaning Problem

Throttle body EFI is one of those parts where the diagnosis matters more than the part. The just-clean-it thinking comes from an era when throttle bodies had an accessible idle air control valve. Newer throttle body EFI modules are sealed, and cleaning doesn't help when the throttle position sensor is dead.

Last year, we replaced more throttle body EFI units than I expected. The surprise wasn't the price. It was how many units were being replaced with a failed internal sensor, not a dirty plate. I don't want to give you a fake percentage, but it was more than I'd have guessed.

If you're buying one, get a unit with the throttle position sensor included if the OEM design has it. The cheap shell with no sensor costs less but costs more in labor. Our techs would rather pay a few dollars more and not transfer a 100,000-mile sensor into a new part.

Jeep Compass Headlight Bulb: Check the Build Date

The Jeep Compass headlight bulb seems like it should be a five-minute job. Sometimes it is. But the part number can change mid-model-year, and that's how I made my rookie mistake.

I ordered a set for a 2020 Compass by model year only. The tech opened the box, looked at the connector, and just shook his head. The bulb was wrong. So glad I checked the build date before reordering the whole lot. If I remember correctly, the build date mattered more than the year on that one. Don't quote me on the exact cutoff, but quote me on this: look up the vehicle's build date or VIN before buying a Jeep Compass headlight bulb.

Also, make sure the bulb is marked as compliant with FMVSS 108. That's the federal headlamp standard. A bulb can be listed as off-road only and still physically fit, but you shouldn't be handing that to a customer for a safety inspection. Put another way: fit does not mean legal.

How to Test a Radiator Fan

Here's how to test a radiator fan in about ten minutes, and it doesn't require a fancy scan tool.

1. With the engine off and the key out, unplug the fan connector.
2. Use a fused jumper wire to power the fan motor directly from the battery. Another jumper to ground.
3. If the fan spins, the motor is fine. If it doesn't, check the connector terminals first. Corrosion and backed-out terminals are common.
4. If the motor is fine, test the relay, fuse, temperature sensor, and fan control module.

I once watched our tech spend an hour chasing a fan that only worked when the A/C was on. The surprise wasn't the fan motor. It was a terminal in the connector that had backed out, killing the low-speed signal. A new fan wouldn't have fixed it. That diagnostic habit is why I don't let our parts ordering jump straight to a replacement.

It sounds kinda basic, but whenever someone asks how to test a radiator fan, I tell them to start at the connector, not the scanner. The scanner can command the fan, but it won't tell you if the pin is making contact. This is one of those cases where the old-school approach is still the best.

When Not to Follow This List

Bottom line: the KYB 344085 Excel-G shock absorber and KYB strut boot are on my short list because they're consistent. But everything has a boundary.

If the vehicle has electronic or adaptive dampers, don't use a standard Excel-G. If the car is going to be raced or heavily loaded, you're looking at a different line, maybe Gas-a-Just or MonoMax. And if the customer's car has a misdiagnosed throttle body EFI problem, replacing the throttle body won't fix a wiring fault.

The fundamentals from 2020 are the same as 2025: verify the application, replace the wear parts, and test before you send it out. What's changed is how good the good aftermarket parts have become. That's why I can write this list in the first place.