power trane overhaul on 2005 Cadillac Escalade

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I purchased the car new. Now in shop for routine servicing, oil change, filter, etc.. Dealer calls to say my escalade needs a power trane overhaul which will cost me about $452 plus taxes and just sounded strange to me. My original warranty is due to expire in June 09. What is this overhaul, why now and is this a needed repair that I must have or a scam?
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I have never heard of a "power train overhaul". Try and get some more information on just what they are planning to do for $452. Also, please include your mileage with your next comments.
on my 05 Escalade, I have 35k miles. I know some kind of overhaul is done at about 45k miles I am told by a friend with same vehicle. My friend says they are telling me it is $452 now but when I get there if I tell them to open the engine up and go ahead, that they will find something else supposedly and I will end up with a $4k ticket. Reason being, they know my warranty is about to expire in June 09. I only come in for oil changes and warranty things to be fixed (they do not make money off me yet). My son was an Adviser at another GM deal in town and told me how it works plus I had an experience similar with my 86 Corvette being serviced.

I went to pick the car up asking the Advisor if I needed to get it overhauled. He told me the tech said it 'needed' to be looked at. I asked the Advisor if this was a problem in my driving it home now . He said no, no problem. I feel I had my answer then. The techs get paid on non warranty work. If my warranty is to expire in June, I would be paying for truly a power trane whatever that would normally be covered under warranty except that if all this work is done and I paid for it then no need for them to tell me at 45K miles that it is time for the power trane whatever and GM would have made tons of money off me without having to use the warranty. Does this make sense to you.

Another issue is that my tires recently are not holding pressure. I have 20s that I got free with the car (they originally sold me with the car some cheap Goodyear tires that wore out at 10k miles. The GM of the dealship came to me personally as asked what kind did I want. I got Michelins; I like them as they wear well. Well now at 35k miles on the Escalade, the pressure is not holding up after I put in 40psi from many different areas all over the city with pressure machines. Next day or the next week all tires are down to 38 or 37psi. This has never happened before. I can usually travel many, many miles without putting air in. The tires have really good tread. My friend with the same vehicle states that something is wrong with the wheel that spits off chrome and affects the tire pressure as she had the same thing to happen. The dealer gave her new tires. Says it is some kind of defect on the wheel? What do you know about this?
I have a 2005 Escalade and the amount of air (40psi) with 20 inche wheels is not the amount my dealerships puts in. They only put in 32psi per tire. I did have a problem with one wheel not holding air. The tech took off the wheel and showed me a bunch of gunk that had build up on the wheel from the heavy snow last winter. He cleaned with wheel and used a sealer and it fixed the linking air.
The Power Train consists of the following basic units in an Cadillac Escalade: Engine, transmission, transfer case(for the all wheel drive), front half-axle universal joints(2 per side), the main center driveshaft universal joints at each end of the driveshaft(that might mean 2 or 3 universal joints on the main center driveshaft depending on the design, rear end differential(differential bearings and fluid,rear axle bearings) You might consider even the front axle bearings technically part of the "Power Train" because it is the multitude of parts (the train)that transmits power from the engine to the 4 wheels. All of those components are part of the "train". You really do need them to tell you a list of the items (in writing)they would inspect and replace if needed under the $452. price they told you. Generally the normal items that can wear out are the universal joints, and they might cost $45. each (6 or 7 of them depending on the center driveshaft design- 2 on each front half axle, and 2 or 3 on the center main driveshaft). If all they are going to do is put the car up on a lift, wiggle the driveshafts to check for significant clicking sounds, and maybe check the gear oil level in the differential case and then charge you $452. then that is a poor value. You could get the same things checked at Jiffy Lube for under $70.

I would ask them instead to define what they will do. Then after you have that list ask online again if what they are going to do is worth it. I personally think it is a way to suck you into their shop and lifting $452. out of your wallet. Bring the car instead to Jiffy Lube or a gas station that has a lift, and ask them to simply grab the driveshaft just a few inches off the universal joints and test for sloppiness. If there is no sloppiness then you've saved $452. There is no question that a "Power Train overhaul" technically involves overhauling the engine, the transmission, the transfer case internals,the front universal joints, the main driveshaft universal joints, and the rear differential. Some could argue that the "power train" consists of everything from the output shaft of the engine to the wheel bearings. There is NO WAY for $452. they are going to do all of that. It would probably cost $5-10,000. they could put the car up on a lift and see a tiny bit of transmission oil wetness at the rear of the transmission output shaft and tell you that you need a new transmission output oil seal and that it isn't part of a "power train overhaul". They could do the same thing with you on the universal joints. I would say "No thanks" for sure and find someone that will be honest with you and simply charge you for a 30 minute block of time to lift it up on a car lift, wiggle the driveshafts and advise you on the condition of the universal joints.

On the tire pressures. If you check the tire pressures after driving enough to heat up the tires, then the air pressure will raise 2-3 psi. You have to make sure that you check the tire pressures under the same conditions. If you put in 40 psi one place, then drive home and let it sit overnight, then the pressures are going to be lower. It doesn't mean that your tires lost air, the air simply is condensed more from the cooler temperatures and measures as lower psi. As for chipping chrome, sounds like defective chrome.