Author Topic: Has anybody else been puzzled by subframe mount loc.?  (Read 455 times)

70_71_78

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Has anybody else been puzzled by subframe mount loc.?
« on: November 11, 2024, 09:45:25 AM »
Good Day! - I've been diving into my '78 body's rusty floor. I would not install new floor pan parts over damaged support parts. That would just lead to near future failure. The cross parts near the rear footwells are simple, but the subframe mount points have me trying to find the best way to clean, metal prep and coat with a sturdy rust preventative paint. Anybody been past this point and have any recommendations?
Thanks,
J

roadking77

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Re: Has anybody else been puzzled by subframe mount loc.?
« Reply #1 on: November 11, 2024, 06:52:45 PM »
If youre talking about the frame rail in your pic, I would clean it and prime it, then where you will need to grind off for some bare metal to weld use some thru weld primer. I tried to hit every bare piece of metal when I was putting my 77 together. I bought some internal frame coating from Eastwood that comes with a uni-directional spray nozzle and a long tube to reach hard to get places. It seemed to work pretty good as it was oozing out of any screw hole it could find. I think thats about the best one can do.
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70_71_78

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Re: Has anybody else been puzzled by subframe mount loc.?
« Reply #2 on: November 13, 2024, 09:59:34 AM »
That kinda sounds like a 10,000 foot view of the task in question. To qualify - This isn't my first floor project. I have built an entire floor assembly for an S10 project, creating parts that were not available by hand including the mounts to the frame. I have put entire footwell and trunk/cargo areas in G-bodies, including creating unavailable support and body mount rails by hand. The difference here is that those are full framed vehicles and the mounting locations are quite a bit more spacious than the rear mount points for for the second gen. front sub frame. That, and the fact that these are intact and I want to preserve them without creating additional assembly, alignment, or corrosion issues makes this a completely different project. I am concerned that disassembling this welded assembly and re-welding after cleaning, metal prep treating and coating will introduce new issues involving assembly, alignment, or corrosion. Not disassembling them has the potential to not treat all surfaces, allow accumulation of abrasives such as sand or glass bead and trapping paint or other rust preventative coating that could prevent movement of the caged nuts that secure the sub frame, potentially making assembly/alignment difficult while creating a break in the corrosion protection when those nuts break loose from the location where the settled into the coating.

I am not building a show car, this will be driven rain or shine, and probably not babied. I do not put things together without assuming that they will need to be taken apart to maintain, repair or modify and I don't want to build in any problems in those future tasks. I am not looking forward to redesigning that whole area. I am thinking that I should inspect the drivers side before going any farther. If it is not in good condition it would force the issue.

Re: Has anybody else been puzzled by subframe mount loc.?
« Reply #2 on: November 13, 2024, 09:59:34 AM »
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