Rear Main Seal job, Pan, etc - 07 Yukon Denali 6.2

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donjetman

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I'm a DIYer and have my own lift at home.
Day 1
I'm starting the process of changing the rear main seal. While I'm at it I'm gonna:
1) Replace the trans fluid and filter, 2) Install oil pan gasket 3) Replace a leaky trans cooler line, mine has an external cooler, 4) new starter, 5) new alternator, 6) install new oil cooler adapter block off, 7) Installed new improved valve cover # 12570427. I recently installed a catch can. It is collecting an once of oil every 100 miles, NOT GOOD.

It took me half a day to get the 6 nuts off that hold the exhaust pipes to the exhaust manifolds. Lots of PB Blaster, patience, and elbow grease. I borrowed a special socket to get the O2 sensors out.

Here's a link to pictures I've taken on Day 1 of this massive undertaking.
https://imgur.com/a/Qo0LX1T
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thompsoj22

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how will you support the trans, will you bring it back just far enough to do rear main and than go right back in? thanks for showing this procedure as eventually ill need a trans and the rear main just makes sense at that point. i cant imagine laying on my back in the garage, that lift is the way to go!!!!!!
 
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donjetman

donjetman

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The lift is nice. Its rated for 10K Lbs. Cost was about $3500.

Are you going to have it tuned?
What are the pluses and minuses? I don't want to make its gas mileage any worse than it already is. And I don't need another hotrod. The main thing I'm gonna use this vehicle for is driving back and forth, 1000 miles each way, between our TX and CO homes several times/yr.

how will you support the trans, will you bring it back just far enough to do rear main and than go right back in?
I am working by myself and I'm letting gravity help me. I will lower the vehicle close to the floor. I will support the engine/trans with a jack while I remove the transfer case with a separate jack. Then I'll use a transmission jack to remove the tranny.When I put it back together I'll probably need a helping hand.
 

swathdiver

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What are the pluses and minuses? I don't want to make its gas mileage any worse than it already is. And I don't need another hotrod. The main thing I'm gonna use this vehicle for is driving back and forth, 1000 miles each way, between our TX and CO homes several times/yr.

A BlackBear tune basically makes the vehicle more driveable and for me, the biggest benefit was in the improved performance of the transmission. It shifts faster and sooner now. The engine makes more power and is ever slightly more fuel efficient too.

As for performance gains when comparing it to an exhaust system or headers, the tune is the best bang for your buck.
 

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