Bolt-in frame stiffener enough?

[traut811]

Hey guys.

I'm going to pull the current 383/700r4 and use my TSP LS7 (because the camaro project is dragging too long so may as well "borrow" it) and a built 6l80/l90. I am currently on Ridetech coilovers and sway bars front and rear. I have several of the "bolt in" tubular cross members. There is a TON of flex in the frame though. I plan to slowly get into autcrossing with the truck and have a wood bed floor (hinged) so that is working against me as well.

My whole goal is to reduce chassis flex when cornering.

I can't afford to go full bore and do full chassis, yet, so need to work with my factory rails to get me by. From what I understand, it is wise to not weld on the rails if possible so that eliminates me boxing in the rails unless bolted in.

That leaves me with basically 3 options:
Nate at porterbuilt is awesome and extremely helpful, but 50% higher than the other version (now on summit) I was originally looking at
$1500: https://pbfab.com/inner-frame-stiffe...-boxed-1-piece

I have no experience with Tin Works but they look nice
$1400: https://tinworksfabrication.com/prod...ame-stiffener/

Unit offered at summit:
$1000: https://www.summitracing.com/parts/sum-770820

Have any of you used these, and will this eliminate most of my flex or will I still need to do more? if so, where else on the frame should be addressed?

Thanks in advance.