Question about Saturn SL1

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I just replaced the valve body & still have banging into reverse.After reading some posts about the input shaft nut becoming loose,can anyone explain how to tighten this nut?

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  • Saturn Master
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You can try tightening the nut.But if the nut is got worn out or internal thread of nuts are rubbed then it will not get tight.In that case it has to be replaced. you need a thin walled deep socket to get to the nut.The cost of nut is $5. Use the 23mm socket and torque the input shaft nut to 111 lbs. You can immobilize the shaft by sticking a phillips screwdriver into one of the holes on the side of the 1st gear clutch pack and wedging it against the output shaft gear. Read this procedure as follows:---- Just click on the link below and follow the instructions mentioned in the link:----- http://technoanswers.blogspot.com/2011/01/saturn-car-input-shaft-nut-tightening.html ------------------ This should help.Thanks.Helpmech.

Posted on Jan 04, 2011

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1 Answer

Transmission shift rough


if it shifts hard into all gears it leads to a bad line pressure solenoid if only into 2nd and 3rd a loose input shaft nut if slams into reverse a bad valve body

Jul 01, 2012 | 1999 Saturn SL

1 Answer

I have a saturn sl1 2000 i change the vevle body is a use one but the revers is not working at all. can tell me wats is worrg with it.



The most common cause of delay or no reverse, other than the valve body, is a loose main-shaft nut. The symptoms will most likely occur when the vehicle is hot, and may also exhibit a soft or flared 2nd gear up-shift. A loose main-shaft nut can cause a Leak in the 2nd clutch circuit. When the nut is loose, the main-shaft walks back and forth In the middle of the case. This causes a small gap between the 1st clutch and the nut, which is where the leak in the 2nd clutch circuit appears. A new main-shaft nut should be replaced with every repair, since it has a factory thread locker. The nut can be accessed by removing the side cover, which means the unit does not have to be removed to replace it. The nut, and this is very important, should be torqued to 111 ft. lbs. The Saturn part number for the main-shaft nut is 21001680.

Another common no reverse condition is a faulty or defective vehicle speed sensor. The input from the VSS to the PCM should always read less than 5 mph. This allows the PCM to command high line pressure, which in turn will move the servo apply valve (1992-up models only) to an open position, thus opening up the passage to allow oil to the forward/reverse servo piston. If the VSS is defective (thus reading 5 mph or above on your scan tool), the PCM will command low line pressure, thus not feeding oil to the forward/reverse servo piston. In turn, the slider assembly will not move, causing a no reverse condition.

Another problem that occurs, especially when the unit has been removed, is an incorrectly adjusted pattern select switch, which we all commonly know as the manual lever positioning switch. If the pattern select switch is not adjusted properly, a no reverse condition, as well as loss of drive and/or erratic or harsh shifting can occur. To adjust the pattern select switch, put the selector in the D4 position. DO NOT start the vehicle. Connect an ohm meter to the switch. Rotate the switch until the ohm meter reads continuity. Once a reading is obtained, tighten the pattern select switch.

Nov 03, 2010 | 2000 Saturn SL

2 Answers

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.

Feb 04, 2010 | 1993 Saturn SL2

1 Answer

The reverse does not work when engine warms up code problem po 732


If reverse does not engage or only moves when flooring the gas then you have a typical valve body problem. In fact it may be a two part fix which is usually the case but not always.

The valve body is the "brain" of the transmission and has valves and bores inside of it along with 5 solenoids. There is one valve called the booster valve that will wear down due to poor manufacturing and debris and gunk build up from lack of transmission fluid changes (suppose to be done every 30,000 miles but more strongly suggested every 20,000 along with the transmission spin on filter).

Once the problem gets bad enough but before reverse is lost completely it will delay going into reverse, meaning when the shifter is moved to reverse it takes several seconds for it to engage. Then once it does it will slam/clunk/bang into gear. The banging into gear causes what is known as the input shaft nut to loosen and untorque. Once it untorques enough it won't allow reverse to engage. However, it will cause problems in 2nd gear as well.

Since you only have issues when warm it sounds like a valve body issue. It is time to replace it. A shop will tell you the transmission is shot and the entire thing needs to be replaced. IT DOES NOT! The dealer will charge you $1,000 to replace the valve body...again TOO EXPENSIVE. I sell rebuilt valve bodies for a fraction of the cost and it can be done in 45 minutes by someone who has never seen a valve body before. The Saturn transmission (and car as a whole) is easy to work on and does not require any special tools or knowledge. I send my customers instructions with pictures and my e-mail for any questions.

You can search this online and on saturnfans.com to verify. My name is Special Forces on Saturnfans, look up my threads about this common problem. Good luck!

Jan 28, 2010 | 2000 Saturn SL

3 Answers

My 2001 Saturn SL1 no longer goes in reverse, it only revs but does not catch. It is also starting to slip between first and second gear. About how much will a new transmission cost?


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.

Jan 05, 2010 | 2001 Saturn SL

2 Answers

I've had my car for a while, it rarely has engine issues, although today it's semming to thud and bang into second gear. Or what I think is second gear. Everything is fine until between 1500 and 2000 RPM's...


This could be a secondary manifestation of the infamous reverse slam problem, though it usually does not affect the forward gears till later. in the TAAT transmission 2nd and reverse are intimately related. The big things that happen are that a valve in the valve body begins to get loose, frequently there is a buildup of gunk in the valve body passageway as well. When this happens the typical first thing that is noticed is a slight hesitation getting into reverse followed by a lurch when it builds up enough pressure for movement. This if left unchecked long enough will start to loosen the input shaft nut on the transmission, and this is when the other forward gears begin to be noticed. The good news if this is the case is that the valve body is fairly easy to replace. Unlike just about every other tranny out there it is actually mounted on the top, note there are only some of the screws that would need to be taken out. Lots of pictures available on the saturnfans forum and even a member that rebuilds valve bodies (I have one sitting in my trunk that I rebuilt from a junkyard, that way I am prepared :) )
The bad news is if the input shaft nut is getting loose it will require a fair bit of dissasembly to get to it (can be done in the car) and a torque wrench capeable of 111 Ft Lbs and a thinwall 23mm 12 point socket.

Nov 02, 2009 | 1999 Saturn SL

2 Answers

The transmission when you start the motor takes time to run on drive shift and runs on second gear and i dont know if something gets hot becouse sometimes after you drive for a while it doesent work my car...


The most common cause of delay or no reverse, other than the valve body, is a loose main-shaft nut. The symptoms will most likely occur when the vehicle is hot, and may also exhibit a soft or flared 2nd gear up-shift. A loose main-shaft nut can cause a Leak in the 2nd clutch circuit. When the nut is loose, the main-shaft walks back and forth In the middle of the case. This causes a small gap between the 1st clutch and the nut, which is where the leak in the 2nd clutch circuit appears. A new main-shaft nut should be replaced with every repair, since it has a factory thread locker. The nut can be accessed by removing the side cover, which means the unit does not have to be removed to replace it. The nut, and this is very important, should be torqued to 111 ft. lbs. The Saturn part number for the main-shaft nut is 21001680.
Another common slow or no reverse condition is a faulty or defective vehicle speed sensor. The input from the VSS to the PCM should always read less than 5 mph. This allows the PCM to command high line pressure, which in turn will move the servo apply valve (1992-up models only) to an open position, thus opening up the passage to allow oil to the forward/reverse servo piston. If the VSS is defective (thus reading 5 mph or above on your scan tool), the PCM will command low line pressure, thus not feeding oil to the forward/reverse servo piston. In turn, the slider assembly will not move, causing a no reverse condition.

Oct 25, 2009 | 1997 Saturn SL

1 Answer

2002 Saturn SL2 = When I put the car in reverse it make a bump sound. Is my transmission going out ?


well,it needs trans work but no you do not need a new trans,either the end nut on the input shatf on the trans is loose or the valve body is bad,,,,either can cause the same concern,,,the end nut we usually do first cause it cost about $500 where the valve body is about $1000 so we do the cheaper one first and hope thats all it is,sometimes its a combo of both the loose nut and the faulty valve body,,where then your talking about $1500 give or take a few hundred depending on shop..but usually if it does it hot and cold its the nut loose and or both,but usually if it only does it hot its the valve body only,,,usually,,,,hope that helps,

Oct 07, 2009 | 2002 Saturn Sl

2 Answers

2002 Saturn SL1 - Losing reverse and second gear


The simple answer is that there are two loose nuts in the transmission.

The output shaft nuts are loose. The are behind a cover that you can see through the driver's side wheel well.

Jul 04, 2009 | 2002 Saturn L-Series

1 Answer

Transmission problem


Two possibilities, one the valve body needs to be replaced. This is very common, and the usual symptoms are delay into reverse, and sometimes second also. The other is a loose input shaft nut. This has become more common on the 2000 to 2002 models, im not sure why though. The nut can be accessed by removing the transmission end cover. The input shaft is the one on the left, it uses a thin wall 23mm socket. The old nut should be removed and discarded, install a new nut and torque to spec (yes this is very important) then reinstall the end cover which is actually harder than it sounds. In the case of the valve body you need to drive normally up to 20 miles to reset the transmission adaptive settings. The input shaft nut does not require this, but it is a good idea. To clear the adaptives you will need to disconnect the battery for about 10 min.

Oct 26, 2008 | 2000 Saturn L-Series

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