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I had the rear main seal om my 1991 GMC Sonoma 2.8L 6 cyl. 5 speed standard trans replaced while the engine was still installed, (pulling the trans back). It still leaked oil. The Haynes Repair Manual page 2D-7 lower right corner says that if that doesn't work remove the engine and the crankshaft and install aservice replacement one-piece rear main seal (available at most auto parts stores) following the instructions provided with the seal. Please help me find this part and advise if this maybe the proper repair needed to stop the oil leak. Thanks! Sincerely, Debra Cooney firstname.lastname@example.org (910) 616-9483.
This Felpro Rear Main Seal Set - part# BS 40625 is an exact fit for your 1991 GMC Sonoma and is 11 mm thick. Replacing this may stop the oil leak. For any further assistance, you may also visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representatives there would be more than happy to assist you.
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