I can't help you with you thickness question but I can tell you this, there is a certain type of weld you have to do with subframes. I may be wrong but I think they call it a meg weld, from what i haer the other type's of welds don't last. Good Luck
I don't recall the thickness, but you will see body holes/plugs and will be able to judge from those.
Remember to evenly load the suspension. Best way to do this is to drive it on a drive on lift or muffler shop.
I drove mine on blocks of wood and then helped my welder friend do the job.
You will be pleased with the outcome of your suspension handling.
I went and looked tonight, and it looks like I won't have the problem some have experienced with '96-'98 cobras with the tranny cross member getting in the way. On my '99 the subframes are clear (well, at least they will be once I remove the factory connectors).
I've budgeted 7 hours for the job, hopefully we won't run into any snags. I'm going to put it on four identical ramps, which should give it about a 8" or so raise. Hopefully that'll be enough clearance to weld with.
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more!