I bought a 02 saturn sc2 that has tranny problems ' an from what i have read an the codes i had ' po732 '733 '734 got me beleaving that it was the valve body 'so i got one from a wrecked saturn at the junk yard an it did'nt help. i mean at first the tranny shifted perfect untill it warmed up. now i dont have reverse an only the first gear works. i changed the filter an put new fluid .should i just replace the whole tranny or is there something i can do to fix this one ?

DTC P0732 sets when 2nd clutch still slips after the PCM has commanded high main line pressure
DTC P0734 sets when 4th clutch still slips after the PCM has commanded high main line pressure.
DTC P0733 sets when 3rd clutch still slips after the PCM has commanded high main line pressure.
The powertrain control module (PCM) uses the crankshaft position (CKP) sensor, input speed sensor (ISS) and output speed sensor (OSS) to determine engine speed, input shaft speed and output shaft speed. These sensor readings are used to determine the current gear ratio and RPM slip across the torque converter. The PCM uses this information from the sensors to determine if the commanded gear matches the actual gear. During normal driving conditions, the PCM will adapt main line pressure via the pressure control (PC) solenoid to prevent slipping and harsh shifts. Shift solenoid 2 is used to apply or release second gear clutch. The PCM controls 2nd gear by controlling the ground for shift solenoid 2. The PCM will turn the solenoid Off (open the driver circuit) when second gear is commanded On to apply 2nd clutch. Shift solenoid 2 is supplied ignition voltage from the fuel pump relay whenever the PCM commands the fuel pump relay On.
Do you know how to test main line pressure ? Also , with the valve body off air check clutch packs . Do you know how to do that ? How many miles on the trany ?

Auto Trans Rebuild Chapter 8 Air Check
Making sure clutch packs are good .

These cars have a safty measure that if a fuse in the fuse box that gets blown or removed it will lock out the tranny..check the fuse box located on the passenger side of the car next to console

Are the axle boot cracked . What do you mean inside trans? Sounds like axle boots a very common issues

well with a check engine light on you really should have it brought somewhere to read the codes stored in your computer it dont make sense to guess at what the code or problem is,since there are several,several codes.it may be a 02 sensor,a evap code,i think a few of the auto parts places have code readers and read for free.

50 key cycles

HAVE YOU MADE A TRANNY FLUID CHANGE AND FILTER??? TRY THAT AND THEN TRY IT AGAIN. IF THE SAME PROBLEM THE TRANNY IS ALMOST DONE.

try saturnfans.com

if you have high resistance in secondary ign. system (plug wires, ign.coil) this will cause this code to set. make sure you are using a high quality spark plug wire set. not from autozone!!! and denso non platinum tipped spark plugs. also use a diaelectric grease on plug wires to keep moisture out.

Your tranny is shot. I had the same problem with a customers car came down to having to replace the tranny

pull the spark plugs out and turn it over a couple times. then after the excess fuel comes out put new spark plugs back in it. try changing the coil pack.