Same PCV Issue and Rear Seal Failure I just had the same issue with my 2013 GMC Terrain 2.4L Ecotec Engine, left my wife stranded on the side of the road when it was -20F outside. But if a rear main seal leak appears when the engine has been recently rebuilt or is fresh, you'll have to track down the cause. Rough estimate to replace the rear main seal (# of hours, costs involved, parts?) The 2012 Chevrolet Equinox has 8 problems reported for rear main seal blew out. How To Replace A Rear Main Seal Without Removing The Transmission – Like A Real Mechanic. bottle for every 8 quarts of engine oil and it should at least slow down the leak and may even stop it. 3. 4 people found this helpful. In this case, installing a new rear main seal of any design should end the problem. 1. Raise the car with the help of a jack so that it becomes easy to reach the rear main seal. I did it on my 283 a few years ago, and it has never leaked a drop since. Average repair cost is $2,980 at 99,250 miles. 635-518 Rear Main Seal Kit 4.8 5.3 6.0 6.2 Fit For Chevy GMC 12633579 12639250. Re: rear main seal replacement cost Aug 19 2018, 3:14pm Around here it's $450 or so to drop and install the tranz, then add the cost for replacing the seal, which shouldn't be much. Read more. If the engine in your car is very old and the seal is leaking, it is most likely the result of age and use. Because that is just silly and there is no need for it. If all you have wrong with your engine is a bad rear main seal then the cost of the seal should be between $20 and $100 dollars depending on what kind of seal you get. I had to replace last year. Why does it leak? I don't believe in offsetting the seal ends though. Some people are getting quotes of up to $2,500 dollars on some vehicles, which is way to expensive for what I was trying to do… The average cost for a Chevrolet HHR rear main seal replacement is between $163 and $242. Should I do/replace anything else at this time (while the Transmission is out)? Re: rear main seal Oct 25 2013, 4:22am Pulling the motor?Sounds like his experience is in S-10 4.3L V6's.No your motor doesn't need removed or lifted in anyway shape or form to replace the pan gasket.On a S-10 yes. Before you start the process of how to replace a rear main seal without removing the transmission, it is preferable to prepare everything vital. MAIN QUESTION! Rae, Thanks for your question about your 1991 Chevy. Just add one 8 oz. To be proactive? The average cost to repair a leaky rear main seal, is anywhere from $800 – $1,200 dollars. Related to replacing the rear main seal on my 2000 Silverado, 4x4, Auto Trans., with 5.3L engine with 210,000 miles! Labor costs are estimated between $152 and $191 while parts are priced between $11 and $51 . Estimate does not include taxes and fees. One tool that some people have had success with is an oil additive called Blue Devil Rear Main Sealer. 2. Average Rear Main Seal Repair Cost – To Have A Mechanic Replace Rear Main Seal. Yes you can replace a 2 piece rear main seal on a SBC without pulling the crank, by just removing the pan and the rear cap. If you're changing the rear main seal I would strongly advise you to also swap out the oil pan gasket as well. If you're out of options, this is a fairly low cost method that has worked for some people with a leaking rear main seal. It has 96,850 miles and GM told me that it was out of warranty by 3 weeks and gave me a special warranty coverage for $600 to repair it.