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Jeep 4.0 Rear Main Seal Replacement Cost: Full Breakdown

The rear main seal is the mechanical seal located at the Jeep 4.0 engine’s rear end, where this seal connects to the crankshaft or transmission and prevents oil from leaking.

So, as soon you notice any sign of oil leaking, make sure to check whether the seal is intact or cracked. Now, you must be wondering how much the Jeep 4.0 rear main seal replacement cost?

Although the actual cost estimation varies based on some core facts, the replacement cost might stay between $500 and $1,100, yet it can go up to $1,800 max.

For your better understanding, I will be providing a details breakdown of this entire replacement job in this article-

Jeep 4.0 Rear Main Seal Replacement Cost (Updated Price)

Technically, the actual rear main seal replacement of Jeep cost varies depending on your vehicle model, year, whether your vehicle has front or rear-wheel drive in it, whether the particular vehicle model has a manual or automatic transmission, and the damage level of your vehicle.

Not only that, but the price estimation of replacing the rear main seal will also vary depending on the parts price for the specific model, preferred servicing center, and their current local rate for such servicing.

More or less, the actual part price is pretty cheap compared to the labor cost because the part price for an average vehicle rear main seal replacement starts from $15 and mostly stays between $21 and $104.

However, the main expense in this replacement task is the labor expense, which typically starts from $410. The labor cost mostly remains between $500 and $983 or $1100 but can go up to $1800.

Especially for the Jeep 4.0 rear main seal replacement task, the part price will cost between $35 and $100. Similarly, the labor expense for replacing your Jeep 4.0 rear main seal can stay between $425 and $1400.

Besides that, depending on whether your vehicle requires any other additional fixing or servicing, the estimated replacement cost can go up or down.

Remember, this explained cost estimation does not include the local tax and other charges or fees.

When Should You Replace Your Jeep 4.0 Rear Main Seal?

Technically, one should decide on replacing it whenever they detect an oil leaking issue on their vehicle.

However, noticing an issue on the vehicle’s rear main seal can be a complicated and challenging task for non-mechanical people, but some signs can help them to identify when their rear mechanical seal needs a replacement-

One of the most obvious signs that your Jeep’s rear seal has gone bad is when you see oil puddles on your garage floor the driveway.

Generally, one can notice this kind of oil puddles when they have parked their vehicle in the driveway or garage for a long period.

But you might also see oil puddles while you are driving, and the wise move will be as soon you see them, either diagnose further to confirm the real cause or contact your nearest service provider to do so.

Another potential sign or hint can be the visible smoke that comes from under your vehicle. Mostly, when the oil leaks because of the cracked or damaged rear seal, the oil often drips on the vehicle’s exhaust and generates smoke.

However, you need to understand the difference between smoke under your vehicle and smoke from your tailpipe.

Since many people get confused between these two, remember, when the smoke is coming from the tailpipe, it has nothing to do with your rear seal instead it indicates that your engine must be burning due to excess oil.

Besides that, if you smell heavy burning oil coming from inside your vehicle cabin, make sure to check on your rear seal’s current condition.

Also, if you notice any accumulation of external dirt or debris between your vehicle’s transmission and engine, that’s an early sign of rear main seal damage or leak.

So, as soon you notice this make sure to diagnose your crankshaft seal or rear main seal of your Jeep 4.0.

Jeep 4.0 Rear Main Seal Installation Guide:

Once you have finally decided to replace your Jeep 4.0 vehicle’s rear main seal after noticing any of the early mentioned signs, it is time to also know what are the necessary tools that one will need for the task –

Required Tools-

  • New Rear main seal kit
  • Socket
  • Ratchet handle
  • Flathead screwdriver
  • Gasket Scraper
  • Coating Oil & Small Amount of Sealant

Thoroughly follow the below instructions –

Step 1 – Before starting the process, disconnect your vehicle’s negative battery terminal to avoid an electrical short circuit.

Step 2 – Now, carefully remove the exhaust system, driveshaft any other vital components such as torque converter so that you can easily remove the transmission.

Remember, if you own a manual transmission, you will have to remove the clutch and flywheel too, and if you own an automatic one, you need to remove the flex plate.

Step 3 – Once you have successfully removed all the other components or parts and got clear access to the rear main seal, search for the rear main seal bolts to remove them.

Step 4 – Mostly, 10mm or 12mm crankcase bolts securely hold the rear main seal housing in its place so remove these bolts first. After that, use a flathead screwdriver to pry the seal housing and slowly remove it from there.

Step 5 – Once the housing is removed, gently pry the rear main seal off with the same screwdriver to remove it.

Now place your old seal beside the new kit and confirm that the inner and outer diameter of your new rear main seal matches with the old one.

Step 6 – When you are finally sure that the diameter of your new one accurately matches the old one, use a gasket scraper to clean the seal housing properly.

Step 7 – Now place the new rear seal into your old seal housing and carefully hammer the seal into the housing. Coat the new seal with oil and also apply light sealant on the surface after installing the new seal.

Step 8 – Next, carefully mount the rear seal housing into its place and securely reinsert the crankcase bolts. Then, reassemble all the components that you dissembled in the beginning.

Note: Remember, the entire replacement process might look pretty easy, but this task still requires certain mechanical knowledge and expertise, so if you do not have that, you should immediately contact professional people.

How Long Does It Take to Replace the Jeep 4.0 Rear Main Seal?

The time duration will vary from mechanic to mechanic based on their skill and experience.

Remember, the task duration not only includes the time to remove the old seal and insert the new one, but it also includes the time when the mechanic diagnoses the actual issue before declaring the actual solution of the problem.

But even for any skilled mechanic, it will take a minimum of 6 to 10 hours max to finish the entire rear main seal replacement task.


Replacing the rear seal is the only way to protect your vehicle from leaking oil issues unless you want your vehicle’s engine, gears, camshaft, and other vital components to wear out prematurely.

That’s why thoroughly read all the information and follow all the instructions regarding the rear main seal replacement provided in this article.

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