Squeaks, and very concerning creaks.
 

Okay, So I recently installed a TKO-500 transmission into my car.

I get constant squeaks just driving around, No idea where they're coming from, tend to happen when I go over bumps though. My mechanic told me that it's problably the axle sliding a minute amount, and needs to be lubricated. I say okay, gonna get that done today...

What's more concerning are the cracks, pops, and creaks that I get whenever I have 3+ people in my car... Seems to be a weight thing, I'm gonna get a video of it on youtube then post it up here.

Double check your transmission mount. Sounds like its worn out or old.