Evolution
Well-Known Member
Perfect write up! Thank you. I will be doing this on a lift with a trans jack so I got the subframe support handled. Diffuser to be installed at the same time as well as other suspension bits.I'm done with it now, it was only necessary for the rear sway and upper arms which are all done. The other arms I have left to do in a couple weeks should be pretty straight forward.
Cusco's rear sway install doc is a good reference for dropping the subframe:
https://assets.ctfassets.net/fmj32k...22_rear_sway_bar_2020_toyota_gr_supra_a90.pdf
To that I'd just add a few things:
1) There are several more lines you'll want to pop out of their brackets than the couple they mention in steps 5 and 8. Basically, any lines you see, you'll want to pop out of their holders so the spindle/hub/brakes can drop. Brake lines, wheel speed sensors, damper control, all of it. You don't need to actually disconnect them, just pop the lines out of their brackets so they're free to move. Except the damper control, that one does actually need to be unplugged.
2) If you ever plan to swap the upper control arms, do it now. It is so much easier to swap out those arms when the entire subframe is 4" lower, not to mention the bolt on one of the arms that literally can't be removed with the subframe bolted in place.
3) If you are swapping the control arms, put some jack stands under the rear subframe supports (the bottom two bolts marked (12) in Cusco's doc on step 12) to help stabilize it. The subframe gets real wobbly when the whole thing is balanced on a jack on the diff, and its pretty sketchy when it's swinging around teetering on the jack while you're pulling full force trying to break a 135 ft-lb bolt. Also if you're swapping the control arms, go ahead and pull the springs and dampers out. It takes almost no effort at that point and it'll buy you even more room to work, especially when breaking some of the bolts on the spindle.
Other than that, no real surprises, just a lot of work. If you have a rear diffuser, that unfortunately needs to be completely removed as well.
Oh, I am doing it. I dont pay people to work on my cars. If I can completely drop a Vettes front and rear subframe in 8 hours by myself, I think I can handle this minor project.By the sounds of it the do is, “do not do it,” and the don’t is, “no, seriously, don’t do it.”
