Just put my DOHC ZC swap in and got it running I was told the clutch was recently replaced and it was an aftermarket one (but who knows) but i saw the clutch pressure plate and its yellow if that means anything lol but I go to drive it home but right off after finally put it into 1st and take off it shakes real bad but when i get going it stops at a certain point and i go to shift to 2nd and i have to pull so hard.. by the time i get to 4th its almost impossible to get it into 4th.. I have mobile 5w20 or 30 i cant remember but i didnt know what was goin on.. if anyone knows or has an idea please help me out

 

if its hydrolic clutch check ur fluid... i had the same problem a few weeks ago... check clutch fluid... top it off and pump it

 

I have an automatic but I still the get the shaking at a certain speed then it goes away. Not too sure about the shifting dilemma but this may help about the shaking...Take it to a reliable tire shop. First check the alignment and balance of all your tires. My alignment was off to begin with. Also, one of the wheels was bent where someone had hit me earlier and I had been told it was replaced. Second, check the axel. My axel was loose and the initial fix was to tighten it while the other part was being ordered. That fixed the shaking somewhat but not completely. Where I live the roads are awful with potholes and speed bumps are the most damaging type on the road. So I would definitely check the alignment and axel to deal with the shaking.

Hope that helps with at least one part of your problem.