Engine Condition Input - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**geunther** · 08-13-2021, 02:28 PM

My engine/transmission were leaking so I pulled both to seal them up. Both are original to the truck and in good shape. The engine has good compression, runs great. Really the only issue was oil leaking.

I pulled the rear main so I could replace the seal. The bearing does show some wear as you would expect. The bearing markings (GMM) indicate likely a factory bearing which matches the date code. The bearing size shows 001.

Now, I was hoping to replace rear main seal, new pan gasket and move on. With the bearing wear, should I replace the mains or does it look fine for the next 10k miles or so to you guys with a lot of engine experience.

Also, assuming its a no brainer to put in new oil pump?

08-13-2021, 02:28 PM	#1
geunther Senior Member Join Date: Apr 2005 Location: Cheyenne, WY Posts: 740	Engine Condition Input My engine/transmission were leaking so I pulled both to seal them up. Both are original to the truck and in good shape. The engine has good compression, runs great. Really the only issue was oil leaking. I pulled the rear main so I could replace the seal. The bearing does show some wear as you would expect. The bearing markings (GMM) indicate likely a factory bearing which matches the date code. The bearing size shows 001. Now, I was hoping to replace rear main seal, new pan gasket and move on. With the bearing wear, should I replace the mains or does it look fine for the next 10k miles or so to you guys with a lot of engine experience. Also, assuming its a no brainer to put in new oil pump? Attached Images



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