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Yes, there are boxed in areas that would be a challenge. I'm not so familiar with the wax sealers, but there are holes and gaps throughout the subframe that could allow for insertion of a tube if spraying a rust preventer within those areas. The first photo in Post #46 gives some visibility of...

Well, removal is ideal, but I suppose it's possible to loosen the 18mm nuts on each of the four posts (leaving the nuts secured to the lowest threads so frame doesn't drop), and that might gain a bit more space to try to cover some of the top, but ability to do any prep work like wirebrushing or...

Here is some additional insight regarding my experience with subframe deterioration for a 2011 Mazda 6 with 117,000 miles. The worst deterioration was at the trail/rear mounting posts (immediately above the coil springs), with the driver side being the worst. The lead/forward mounting posts...

Well, the e-Bay subframe (LKQonline) arrived and was in terrific condition. Unfortunately, it was for the front subframe (first pic below). I initially decided to refuse the shipment (and LKQ was easy to deal with since the error was theirs), but I ultimately decided to keep the front subframe...

Exactly the info I was looking for, especially regarding re-use of old hardware. Looked like they were able to reuse your upper and lower (rubber) coil spring mounts, so I'll look to do the same if they are suitable. Incredibly helpful details in your note and in your thread, as well as the...

GMFan, following up with you on rear sub-frame rust issue. I see in your maintenance thread that you ended up replacing the rear sub-frame. I'm looking to do same with a 2011 Mazda 6. Once I get the second-hand subframe in hand, I'm going to attempt to DIY it. Looking to see if you had any...