Bryaaansw

I’m hoping someone one here can help me solve this problem. I have a s13 hatchback with a sr20det and if I try and burnout it’ll shake bad what I think may be wheel hop. Example. If I try and do a burnout the car won’t do a clean burnout like it used to. The shifter violently shakes and shakes the whole car. Also say I take off from first and spin tire it won’t shake but once I throw it into second it does the same thing shakes the shifter and the whole car and sounds like it’s wheel hopping. But if I’m sliding the car sideways it won’t shake. It does perfectly fine donuts and can slide a corner. The day I noticed it may have been the day I messed something up or broke something. I took it to the local drag strip for shits n giggles and launched it at launch control. Which was set at 5,300 rpm. Yea kinda dumb I guess but I didn’t think much of it at the time. Anyway I just want do nice clean fun burnouts again.

Okay now to the things that I’ve changed to try n fix this problem. I’ve changed my subframe bushings with ES poly bushings. Isr suspension arms. Controls arm bushings and ball joint. New axles. Swapped diffs with a friend. One piece steel driveshaft. Clutch and flywheel. Transmission mount. Motor mounts.