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Pinion Seal

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If you look closely enough, you will find parts and components all over your car with seals as well as sealants in order to keep necessary fluids from leaking and causing more problems because of unwanted leakage. Your car has a pinion gear which is responsible for driving your ring gear in the differential. The pinion seal is the covering on a pinion that seals in gear lube. If and when your pinion seal gets damaged or broken, the resultant problem which will prove to be a bothersome nuisance in the end is that gear lube will leak, thus bearings will go out and your brakes will lock up if and when you inevitably run out of gear lube. To prevent such problem, keep a steady watch on your pinion seal and have routine maintenance checkups. If ever you do get to the point where you need to have your pinion seal replaced, order your replacement pinion seal here at Auto Parts Warehouse. All you need to do is browse from our online catalog, choose your needed product, place your order, and that's it! No worries about shipping because we'll conveniently ship it to you right away. So check our catalog now!

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Pinion Seal: Keeping the Lube in the Tube

All parts that spin or rotate need lubrication, or else they tend to heat up very quickly. The downside to lubrication is that if you put liquid on anything spinning, it tends to fly off in all directions-and nobody wants a mess. A pinion seal keeps that mess at bay, all the while keeping your pinion gear fully lubricated. If you have to change yours out, and staunch the leak that is messing up your garage and getting the missus angry, read on.

Shape, size, and form

When it comes to choosing a pinion seal for your ride, the most important thing to note is that it is closely tied with the specific specifications of your pinion gear. In particular, you need to look at the bore, the width, the shaft, and the outer diameter. Too "off" a set of measurements could mean that it might not fit or-even if it does fit-it won't be effective at providing a secure seal.

Two methods to matching

There are two ways to match that you can turn to that helps determine sureness fit:

  1. Look for the part number or manufacturer's number for your seal. You can find this information in the owner's manual or, sometimes, the part itself. It helps you to find a perfect match because you can give this number to a dealer or use it when you search online.
  2. Speaking of "online", the second option is to shop online. A lot of the sites up and out there have very specialized search software that lets you specify your vehicle's exact year, make, and model-it will then only give you results that are specific to your needs.

*Caution* Sometimes, results from searches aren't as specific as we want them to be. It always pays to be a smart shopper. Verify all that data that you get from an online retailer against what you need. This kind of double-checking helps to minimize the chances that you end up getting the wrong product!

The final word

There are two final things that you cannot overlook. The first is location. Are you trying to replace the front or rear pinion seal? These are very different from one another, so make sure you check. The second thing is price. A good-quality pinion seal will set you back between $10-15 on average-any more is overspending, any less might be of questionable quality.

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Suspension 101: Replacing a Rear Pinion Seal

So you want to replace your rear pinion seal. Why not undertake the task yourself? It's a bit of a doozy, but all you need is a couple of tools, some patience, and our carefully made step-by-step guide to get you doing-it-yourself. It not only gets your rear suspension clean and free of lubricant cast-off, but also saves you a couple of dollars on labor costs!

Difficulty level: Difficult

Things you will need:

  • New pinion seal
  • Screwdriver
  • Drain pan
  • Mallet
  • Jack
  • Jack stands
  • Gear oil
  • Brake Cleaner

Step 1: Carefully raise the rear of your vehicle with a jack, and secure it with jack stands before disengaging the jack.

*Note* Make sure that your ride is well-mounted on the stands-you might suffer a terrible injury if it isn't.

Step 2: Check the rear differential housing for the possibility of any oil leaks.

Step 3: Take out the gear oil fill plug, and set it aside.

Step 4: Slowly disconnect the u-joint from the pinion flange it's connected to.

Step 5: Remove the nut securing the pinion shaft.

Step 6: Place a drain pan under the pinion flange, then remove the flange.

Step 7: Remove the pinion seal.

*Note* Jostle the seal a bit to determine how tightly it is fit-you might be able to take it out with just your hands. If it's too tight, use a flathead screwdriver to pry it out-just be gentle about it.

Step 8: Wipe down the housing with a clean rag, and put in the new pinion seal-lubricate it with oil.

Step 9: Reinstall the pinion flange, the securing nut and its washer, then torque it to the manufacturer's specifications based on your owner's manual.

Step 10: Reconnect the driveshaft to the pinion flange, and torque its restraining bolts-again, refer to your manual.

Step 11: Re-fill the differential housing with oil.

Step 12: Tighten the drain plug to approximately 25 ft. lbs. of torque.

Step 13: Carefully lower your vehicle to the ground.

You're done! Test drive the vehicle, and check for leaks after to verify the correctness of the installation.

Safety Tips:

  1. Always be very careful when working under the vehicle. Position the stands so they do not interfere with movement.
  2. Use, at least, the minimum in safety gear: goggles protect the eyes from contaminants, while gloves keep the hands safe from sharp metals under the vehicle.