I heard swapping from auto to manual transmisson causes slightly higher height of the front, due to its lighter weight.
Does this mean there are two kinds of stock coil springs for the front?
Any info is welcome.

 

There are multiple spring rates depending on a lot of car options.

 

Thanks.
Are there any charts or something like that available?

 

Maybe but I'm not sure. I ran V6 springs in the front of my BBC car for a few years.

All things being equal in the car
Soft spring = soft ride, car sits lower, suspension moves more (dives in corners etc)
Stiff spring = stiff ride, car sits higher, harder to compress suspension

Generally, a general purpose comfort spring like in an RS provides a soft ride while springs in a Z28 or WS6 are stiffer for better road handling but give up the softer ride.

Springs hold the weight of the car up to a specific ride height. The shocks do all the work. Too stiff of a spring and the shocks don't do anything.

 

I would swap the trans and see where it sits. My car has a manual, the same springs as an auto and never sat higher in the front. A trans is a little more centrally located in the car so you may not notice change all at one end like an engine change or a full tank of gas.

JunJun, keep in mind that spring height prior to installation is a huge factor. An example is the factory front springs are around 400-600lbs and make these cars sit kinda high at factory ride height. Eibachs front springs are 700lbs (stiffer) and will set the car lower because they are shorter springs.

Stiffer springs will handle, corner better. Alky just needs them to keep his front end from hitting the ground, especially after carrying the front wheels of his beast!!

 

The weight is not ALL THAT MUCH different.

How different in weight might 2 drivers be? Let's say, a 17-yr-old Asian female, and a 55-yr-old 275 lb American ... blob? (on the driver's side ONLY, no less)

How about, full tank of gas at the rear (roughly 120 lbs of fuel), vs empty tank?

The difference in transmissions is QUITE A BIT LESS than any of that.

Don't outsmart yourself by over-stressing over details that are too tiny to be relevant. Think, "measure with micrometer, mark with spray paint, cut with dynamite".

I SERIOUSLY doubt that swapping transmissions will even be noticeable in the overall grand scheme of things.

 

Taking weight out of the car will affect the ride height. Is it enough for you to actually notice a difference? Probably not.