I'm assuming you mean the shaft that goes from the transmission to the wheel. If you are moderately handy, it is fairly easy to do, just time consuming. There are several good you tube videos on the procedure. You should be able to find the part fairly cheap at a local junkyard. Possibly even on Ebay.
SOURCE: Cam Shaft Position Sensor 1998 Saturn SL
Have a look at this link, scroll to your engine & click on picture to expand for better view.
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528017e904
SOURCE: how to replace coolant heat sensor on 1998 saturn
the coolant temp sensor is located on the right side of the cyl head its small under by the upper rad hose 13mm socket removes it after u take the small connector of,make sure the car is cold coolant will come out when u remove it,,,,check the connector too for corrosion,by only saturn sensor the cheap autozone and aftermarket ones dont read right and give you the same problem as the old bad one
SOURCE: Where is the fuel filter on a 1997 Saturn SL2?
It is an inline fuel filter under the car in the frame rail up front neat the motor area. It will look similar to this...
On that saturn it has a hose already attached to the fuel filter. It has what they call quick connects on both sides. just remove one side of air intake. (the one closest to firewall of car) where you can get your arm in there. Reach right under fuel filter and grab two white or green tabs with pointer finger and thumb. and squeeze till they make a snaping noice. then all you have to do is reach under fuel filter and pull hose off. Then push the black clips around fuel filter out and it should slide out. The same on the hose already connected to the fuel filter
SOURCE: How to take off door panels on a 1998 Saturn SL2
You have to take off the door handle. You have to disengage the door
locking mechanism from the door handle, then unscrew the panel and take
it off. 
The door handle unhinges from the locks and from the
window controls.
If your windows are electric, just unsnap the cord
attached and leave it hanging out.
You may have to work with the door handle as it won't come out of
the slot very easily and you don't have a lot of room. A flat bladed
screwdriver with a long metal piece should work to unsnap it.
Hope helps (remember rated this help).
Testimonial: "This was very helpful and I like the pictures which also help. Thank you very much."
SOURCE: 1999 saturn sl2 transmission wont shift from 1st gear
Your valve body and possibly input shaft nut need to be replaced. The valve body's booster valve is worn down and won't create pressure. Before it went completely out it slammed on the input shaft nut and loosened it.
You need to replace the valve body and retorque the input shaft nut. The transmission is not junk. The above needs to be replaced and change the filter and fluid and do it every 20K miles.
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