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labwork 635-518 Rear Main Seal Kit 4.8 5.3 6.0 6.2 Replacement For Chevy GMC 12633579 12639250
Replacement for 2012-2013 Chevy Tahoe and Chevy Suburban 1500
Replacement for 2013 Chevy Silverado 1500
Replacement for 2012 Chevy Express 1500
Replacement for 2014 Chevy Silverado 2500 HD and Chevy Express 2500
Replacement for 2012 2013 2014 2018 Chevy Express 3500
Replacement for 2012 2013 2014 2018 Chevy Express 3500
Replacement for 2012 Chevy Avalanche and Cadillac Escalade ESV
Replacement for 2013 GMC Yukon and Sierra 1500
Replacement for 2015 GMC Sierra 2500 HD
Replacement for 2012 2014 2015 GMC Savana 3500
Package Includes:
Cover, Seal and Gasket
Color: Silver
Specifications:
Inside Diameter (in): 2.7 In.
Length (In): 10 In.
Width (in): 6 In.
Part number: 635-518 , 12633579, 12639250
Material: Aluminum
NOTE:
Please check the product package label carefully. Installation instructions: Before fixing the mounting screws, make sure that the aluminum cover and the flange shaft are in the same center before fixing the mounting screws.
Anita B.
2025-08-04 13:44:35
Bad choice this part ended up costing me a lot more money in the long run. No good do not buy.
daniel kearns
2025-06-14 15:11:18
Replaced original one with over 250000 miles and plate gasket was leaking around starter bolt originally. This one leaks engine oil when hot after 10 minutes and will not leak when oil is cold. Tried 4 cold starts thinking seal would eventually seal but nope when hot the longer and hotter engine runs starts as drip to almost a steady stream. I thought it might have been bad seal could confirm leak through flywheel area seeing leak start. Pulled trans back out inspected crank the position of seal to crank for alignment and replaced with same product same after 10 minutes getting hot it starts as drip and then steady drip to stream like seal is not mating to crank. Again it did the same like an idiot i should have went with felpro or oem. I ordered another to compare the seals theses are hard and not made of teflon as the oem material and with this kit. The rest of the kit is fine but seal is junk. 3 times was a charm never again will i buy this again lost 2 days of work and aggravation. Never again don't need practice pulling a 4x4 transmission and replacing seals. Was faster each time with all the tools still out.
Leo
2025-03-04 11:57:37
what a pain in the ass to change, but so easy to install once you get to that point. everything fit great and now I have Zero oil leaks. you might as well change the oil pan gasket and the oil pick up tube o-ring since you are at this point already.
Tom Frank
2025-03-02 18:39:38
Function as designed
Customer
2025-02-09 18:51:32
Good, thanks............
Lisa Bilbrey
2025-01-16 14:12:36
This product was easy to installAnd i love this product...
james armer
2025-01-07 14:09:50
This product is warped or machined improperly. This product would not seal causing a leak worse than previous main seal. I had to pull transmission and replace again with another product. This of course cost time and money.
Rick B.
2024-11-23 11:07:32
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