One of my good friends has a Trailblazer (go ahead, take your shots) which she loves very much with about 70,000 miles on it. Two months ago the dealership, where she gets it serviced, told her she needed a transmission flush as part of regular maintenance, so she had it done. Everything was fine, until two days ago. The car just started pouring out transmission fluid on the highway, and fortunately went into limp mode and she was able to get it towed to the dealer. I thought maybe it would end up being a stripped drain plug that had popped out, but it turned out it's "at least" a bad front seal. She showed me a picture, and man, this thing was just dumping fluid. She's waiting for an estimate.

Now ... I'm not an expert, but am I out of line to think that the flush may have had a lot to do with the sudden failure of the seal(s)? I know once a transmission reaches higher mileage, if it's never had the fluid changed, you don't change it ... although hers only had 70k and I'm assuming is using synthetic ATF. But I've also heard flushing a transmission isn't a good idea at all. I'd think the internal pressure, plus solvents in the new fluid, might knock loose some of what was holding the seals together and also put extra strain on the seals.

I'm just curious what the thought is on flushes. I never flush my 87, just drain pan and TC for a long time and fill it back up, every 30k.

Hopefully the repair won't cost her too much anyway ... she just lost her job and this is the last thing she needs.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)