justin_bfn

Looking for help yet again because I cannot figure this out at all. My rb20 in my s13 is giving me shit. So when you go to take off not even hard just normal drive you can see the whole shifter bounce. In fact when the boot is off you can see the whole back of the trans bounce. And it gets more intense as you go faster. And it sounds like the bolts are hitting up against something but they aren't even close to hitting anything. And that also gets more intense as you go faster. Trans mount and carrier bearing are fine. Both mounted up tight. So I'm pondering is the stock s13 ka drive shaft too small for the swap and came unbalanced? This was an auto car if that helps. The driveshaft I believe is outta a 5 speed ka. I was also thinking bad u joint maybe but I don't think it'd do it this bad. I'm tempted to buy a one piece specifically for the swap. But I don't want to dump that money into it if that's not it. Thoughts?