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Message: <blockquote data-quote="stutaeng" data-source="post: 27801" data-attributes="member: 6175">Yeah, a lot of 4L60e do live very long lives. The one on my 99 made it to 260k. At around 225k it did start having that P1870 code, which is common issue with the TCC valve/valve bore wear. I didn't know anything about mechanics back then, much less automatic transmissions. I just kept driving it and the issue only really happened after driving on the highway for longer than about 20 minutes. Back then my job was only a few miles from home and city streets so i just kept on truckin'.After I bought my 06 Suburban I retired the Silverado (now also with low oil pressure on the V6.) I seriously considered listing it for $1500 on Offerup/Craigslist. Truck was in pretty good shape for the year. Not wrecked, beat up and paint was in failure decent shape. I eventually decided to "LS swap it" as everyone, their grandma and cat was doing, and the rest is history! Lol Actually, the transmission still had bright cherry red fluid with minimal clutch material in the pan. I sold it to a fellow that was looking for transmission for a short period while he got his Tahoe transmission rebuilt. I told him my transmission was serviced and what it had, and suggested it was probably best to rebuild the unit I sold him since that unit hadn't had catastrophic failure. Based on what he told, his Tahoe had the geartrain explode.The issue with a lot of transmission shops is they simply fix what failed, slap them back together and send it, without doing a complete rebuild. Replacing all gaskets, seals, o-rings, bushings, etc. is time consuming and expensive, and most folks are looking for the cheapest prices anyways.  You have to find the right shop to do a good job.</blockquote>