97 SATURN SC1. TRANNY PROBLEMS. WONT GO INTO REVERSE AND GOES REAL SLOW. HAVE TO UNPLUG BATTERY AND IT WORKS FINE FOR AWHILE. HAD SPEED SENSOR REPLACED AND SIDE SENSOR. NOW THEY ARE SAYING IT IS JUNK.
Transmission is not junk. You need to replace the valve body with a rebuilt one. The cause of reverse not working is because the booster valve cannot create sufficient pressure to get into reverse (reverse requires the most pressure). The booster valve is worn down and the valve body needs to be replaced, rebuilt is the way to go. This is from not changing the fluid and filter every 20,000 -- 30,000 miles to keep gunk from building up and wearing down the valve.
The transmission is fine, don't let anyone talk you into putting another one in, especially for thousands of dollars, NOT THE PROBLEM.
Posted on Feb 03, 2010
Also after replacing the valve body with a rebuilt one depending on how long the transmission was being "slammed into reverse" the mainshaft nut could be loose causing other problems with gear engagements particularly with second gear being 2nd and reverse and intimately related in this automatic transaxle.
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Posted on Jan 02, 2017
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