Transmission slams into second and when I put it in reverse it slams real hard also

I means the transmission pumps pressure regulater is failing
that VAC line tells the box engine load. and if bad can cause
transmission to shift wrong. upshifts early or late.
but none the less it is bad fix what you see is bad.
does this box have TV cable, from TB TV valve top transmisssion
if yes it too must never be jammed, it is, transmission damage deeper happens./
they both control pump output main control pressure.
VAC modulatori and the TV cable. (throttle valve = TV) from TB throttle body
it is pump pressure issue on the main line(inside)

yes 800 rpm is slower than 1500 cold RPM an the pump runs slower so yes, pump output is less.
the transmission manual has page covering pUMP output port tests.
in all gears to see it fail. all transmission shops this is one of the first tests. besides, cable TV bad or VAC mod bad.

Manual transmission ... clutch worn. Automatic transmission ... that will happen if tickover is too high.
Fix the tickover issue, probably mass airflow sensor or air leak, then gears should sort themselves out.

get it serviced?
hard starts are usually never getting a tuneup, (like spark plugs?)
slamming in to gear is normal if RPM is too high in park, is it.
wont move , in any gear, car wont move even in reverse.
and RPM of engine does what , sticks low, like 800 rpm
or screams at the advancement of right foot.
need lots of details. we cant drive car, but if could in 5min flat all that is clear,
eg:
transmission slips
engine weak
engine racing in park too high.
wont start and misfires when it does.
is fuel fresh, not year old.
ever get a new air filter and fuel filter. if filter is outside tank.

may be short of gearbox fluid or tick over may be to high

There is a point that a machine works and a point that it stops, you need a transmission rebuild.

your trans needs a new throttle body, they can be found (rebuilt) on the internet for less than $150 and can be replaced without removing the transmission-it is a very common issue with Saturns. try not to let it 'slam' into reverse, if you do, you'll end up having to repair the output shaft (best case) plus do the valve body, and worst case, you will have to have the trans rebuilt/replaced.

These cars have a reverse slam problem usually....If you have no reverse , you may be looking at a new transmission. You can try cleaning the trans out with transmission sea foam. Put a new filter and fluid in the trans along with a can of sea foam. Set the parking brake, put the car in reverse for 30 min. If that doesnt do it, It may be a solenoid. Not too hard to get to on these.

Sounds like this is an automatic s-series. Sounds like you previously had a reverse slam in the car. Meaning when you put it in reverse it would delay then slam. As this gets worse it begins to untorque what is known as the input shaft nut. Eventually this nut will get so loose that you lose reverse completely.

The transmission itself is fine and does not need replacement. $1,600-$2,200 is probably not even what the car is worth. The valve body needs to be changed out with a rebuilt one and the input shaft nut needs to be replaced and torqued down properly. Both of these are easily done by any backyard mechanic. Roughly 3 hours will have your transmission shifting like new.

I rebuild Saturn valve bodies (check my ad for more information) and provide instructions on how to do the repair. It costs much less than what any shop will tell you and they'll tell you the transmission is toast...IT IS NOT!

Any questions, just let me know.

yes take it back if you are still under warranty.

have you checked fluid? it sounds like a low fluid issue