Saturn transmissions are considered to be "zero maintenance", and as such are sealed. There is no dipstick nor is there any user serviceable fill ports.
At least, not easily serviceable.
You CAN remove the pan to drain the fluid and change the filter.
You can also open the port on the side of the transmission and add fluid to the full mark. You'll need to identify where the port is by referencing a service manual.
Remove transmission oil pan
Yes it does. It carries dexron III ATF
Dexron III
Where the dipstick goes in underneath the battery tray.
The recommended Oil for a manual transmission in a 1997 Saturn SL1 is synthetic multi-vehicle automatic transmission fluid or ATFQT. The recommended engine oil is SAE 5W-30 synthetic motor oil.
Same place you check the fluid level. If there is no place to check it, then it is a sealed transmission, which needs no service. At least that is the idea.
The speed sensor on a 1999 Saturn SL1 is under the transmission. It is below the fittings for the transmission cooler lines.
Any Saturn Automatic transmission from 1994-2002 with the stamp of MP6 in the top of the bell housing will work in your 1994 SL1. Do not use transmissions from 1991-1993 because they do not have the casting in the top of the case for the transmission torque strut mount.
It's right next to the transmission oil filter. It has a two-wire connector plugged into it. NOTE: if you have a manual transmission, there is no trans fluid temperature sensor.
2350lbs estimate
No it does not. Most manual transmissions don't even require a fluid change, but it can't hurt. Capacity for the Saturn is 2.6 quarts
The 95 Saturn SL1 does it too.