Quote (Penguins0690 @ Sep 13 2013 10:30am)
forgot to mention engine mounts were replaced already

also, i know it is normal for a car's interior lights to
dim and the rpm's to drop when front window defroster is turned on... how do i know if it is losing too much power when that happens though? i'm not sure how I can tell because all my interior lights get significantly dimmer.
ill try to make a video but i'm not sure how I would go about uploading it on here from my phone

While the car is running, the battery isn't doing much of anything. Its all on the alternator. Have it checked. The dimming should be barely noticeable, and go away almost immediately. The RPM drop means it is putting too much load on the alternator.
Also, you don't have a five speed transmission. The "fifth" gear is actually the overdrive band, which is why the transition is less severe.
There are only really a few things that can tell you what is happening with a trans-axle without getting it off there and looking. Apart from what it does on the road: Fluid levels, visual abnormalities, and odd sounds.
On a side note.... I've dealt with "family mechanics" quite a few times...and I gotta tell ya man, its a crap shoot. There is a reason they aren't successful mechanics.
I would advise taking it to a reputable shop that does quite a bit of business. They may charge you a few bucks to look it over, but its well worth the price in the long run.