OEM rules typically apply a multiple of front GAWR for suspension design. IIRC lower ball joint axial loads can hit around 30kN+. Given the lever arm I would say 40kN at the shock/spring. So probably around 9000lbs. This would be a severe event though but not sure what happens if you run out of shock travel.

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Thanks!
 

Thanks Josh ... thanks for all your help over the phone! I'll have to call and get another set of those coil over mounts (my first idea didn't work so good and I already clearanced them for the bolts). Can't wait to put these shocks to work!

This is what I had in mind ... rude drawing and not to scale!

http://imagizer.imageshack.us/v2/102...537/Bdq4yU.jpg

Any other ideas?

It's a cubic function for stiffness benefit in the cross car plane vs what you've sketched. Is their room just inboard of the frame rails? If not, you are probably fine as is.

Huh?
 

Huh?? You lost me there ... there is only a few inches inboard then the headers come into play.

Something like this? Like a roll cage brace, gusset? Cross plane, using 1/4" plate ... work too?
http://imagizer.imageshack.us/v2/102...661/8aCtcB.jpg

Thanks ....

due to the load direction I'd go this route, if you have the room.

Only time I have seen a mount fail was a shock failure and shock was too short.

All of options seem like they would work but would just be putting a bandaid on it. It would be a lot more work to cut the entire square tube back out and fix it the right way but it would be cleaner and you wouldn't have to think about it or question the repair later.

I'm with Vince. It's probably what I am going to do to mine.

JJ ... I like Vince's idea as well, HOWEVER, as my first mount added 3/16" towards the outside and increase the angle of the dangle of the shock it also reduces the clearance to the spring. That's why I decided to take it off the get the shock bolt closer to the mount (decrease the angle) ... I wished the RT mount had a 1" offset bolt hole instead of 1 1/2".

I have another idea to brace the mount from the engine side ...

Honestly if it were my car I'd cut the whole section out and go the DSE style mount. Superior to the existing.

My other option
 

for the shock brace is ... 1" x 1/8" square stock cut to match the inside of the shock tower (?) I rough cut this one out ... need to refine it a little.

Also cut up the headers ... took 1 1/4" outa the vertical sections of the tubes and now the headers are above the frame rails! Need to cut the tubes at the collector to 'clock' each individual tube to match the upper tubes and then sleeve the 4 tubes and install the collector .... never done this before so I guess its going ok!

http://imagizer.imageshack.us/v2/102...908/KnbviU.jpg
Side view of brace ... needs to be a little taller!
http://imagizer.imageshack.us/v2/102...538/zujGzt.jpg
Clears the headers too!
http://imagizer.imageshack.us/v2/102...540/WGdI4d.jpg
Square stock rough cut 1/8" thick .... should do just fine!
http://imagizer.imageshack.us/v2/102...538/oAh06T.jpg
Cutting headers to gain clearance, yahoo!

That's what I came up with from adding structural integrity to the mount. Vince ... cutting all this out is not an option, I don't have the know how to weld something completely new in its place.

Thanks for looking ....