Auto Parts Guides
What our specialists explain on the phone every day, written down: how to identify the right part, when used beats new, and what to check before you buy anything.
- Fitment verified by VINbefore anything ships
- Ships in 1–2 business daysUPS, FedEx or USPS with tracking
- 30-day returnson unused, uninstalled parts
- Cooling & AC partsWhich Radiator Fits Your Truck? Tow Package, Trans Cooler and VINWhy the same truck lists three radiators, how to read the RPO label and the old radiator's fittings, and when the radiator isn't the problem at all.
- Catalytic convertersCARB vs Federal Catalytic Converters: Which Is Legal WhereEPA versus CARB-certified converters, which states require CARB, what an Executive Order number is, and how to buy the one that passes inspection.
- Used OEM auto partsParts You Should Never Buy Used, and the Ones You ShouldA straight list: which auto parts are a smart buy used, which are a false economy, and which sit in between depending on the vehicle.
- Order by part numberHow to Find Your Car's Part Number: Five Places to LookWhere OEM part numbers hide, what Ford, GM, Mopar, Toyota, Honda, Nissan and Mercedes numbers look like, and how supersessions work.
- Vehicle lookupGM RPO Codes: Read Your Glovebox Label Before Buying PartsWhat the GM Service Parts Identification label tells you, the RPO codes that decide parts fitment, and how to read engine, axle and cooling codes.
- ABS modulesDoes a Used ABS Module Need Programming? By Make and YearWhich used ABS modules are plug-and-play, which need coding to the VIN, and what a shop needs to finish the job, make by make.
- Transfer casesHow to Identify Your Transfer Case: Tag, VIN and Shift TypeWhere the transfer case tag is, what BorgWarner and New Process numbers mean, how shift type changes the part, and what to send for a quote.
- Suspension & steering partsSUV Sagging Overnight? Air Spring Leak vs CompressorHow to tell whether a sagging Mercedes, Cadillac, Lincoln, Lexus, Land Rover or Ram is leaking air or has a tired compressor, and what to replace first.
- Cooling & AC partsTruck Overheats in Traffic Only? It's Usually the Fan, Not the RadiatorWhy a truck that runs cool on the highway and hot at a stoplight has an airflow problem, how to check the fan, and when the radiator really is the cause.
- Used enginesHow to Verify Mileage on a Used Engine Before You PayHow recyclers grade used engines, how to check the donor's history, what to inspect through the oil cap, and what a used engine warranty should say.
- Brake padsWhat a Brake Job Costs, and Where the Money GoesWhat drives the cost of a brake job, how parts and labor split, when rotors and calipers add to the bill, and how to keep the parts side down.
- Suspension & steering partsWheel Bearing Replacement: Cost, Symptoms and Hub AssembliesHow to tell a wheel bearing from tire noise, why most modern vehicles use a hub assembly, and what decides the cost of the job.
- Engine, fuel & ignition partsTiming Belt Replacement: Cost, Interval and What to Replace With ItWhich engines have a timing belt and which have a chain, the replacement interval, why the water pump goes with it, and what decides the cost.
- Cooling & AC partsCar AC Not Cold: Recharge, Compressor, Condenser or Fan?How to tell whether a car AC that blows warm needs a recharge, a compressor, a condenser, a fan or a blend door, and why a recharge alone rarely lasts.
- Batteries & electrical partsAlternator Failing? Symptoms, the Battery Test and What to ReplaceHow to tell a failing alternator from a bad battery, the symptoms in order, why the belt and connections matter, and reman versus new.
- CV axlesCV Joint and Axle Replacement: Cost, Symptoms and Boot vs AxleWhat a clicking CV joint means, when a boot repair is still possible, why shops replace the whole axle, and what decides the cost by drivetrain.
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