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Old 12-24-2005, 10:53 PM   #1
tgferg67global
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Default Auto trans problems.. loose input shaft nut?

I have a 97 SC1 automatic with 130,000 miles, which has some trans problems. When cold the transmission will not engage into reverse unless I raise the rpm's and when hot it will not engage at all. This problem happened all at once, as there was not gradual increase of symptoms. The transmission has always shifted harder into reverse than into drive (reverse slam) but never seemed real bad (reverse slam).

Am I on the right track suspecting the input shaft nut?

How do you hold the input shaft from turning when installing the new nut "without" buying the $150 special tool?

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Old 12-25-2005, 10:53 PM   #2
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Default Re: Auto trans problems.. loose input shaft nut?

Check your fluid.

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Old 12-26-2005, 11:36 AM   #3
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Default Re: Auto trans problems.. loose input shaft nut?

Quote:
Originally Posted by tgferg67global
I have a 97 SC1 automatic with 130,000 miles, which has some trans problems. When cold the transmission will not engage into reverse unless I raise the rpm's and when hot it will not engage at all. This problem happened all at once, as there was not gradual increase of symptoms. The transmission has always shifted harder into reverse than into drive (reverse slam) but never seemed real bad (reverse slam).

Am I on the right track suspecting the input shaft nut?

How do you hold the input shaft from turning when installing the new nut "without" buying the $150 special tool?
Before I dove into replacing the input shaft nut I'd try Wolfman's reverse slam cure. If that doesn't work, here's a link to info on dong the input shaft nut.

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Old 12-26-2005, 09:51 PM   #4
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Default Re: Auto trans problems.. loose input shaft nut?

It's the nut. I could amost turn it off by hand.

How does one tighten the nut without the special tool?

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Old 12-27-2005, 01:03 AM   #5
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Default Re: Auto trans problems.. loose input shaft nut?

Some, including myself, have used a C-clamp to hold it in place. Being careful not to gouge anything, I used the handle and put it up on the suspension componets. Seemed to work fine for me. Make sure to get a new nut. Costs a dollar or so at the dealer.

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Old 12-27-2005, 06:52 AM   #6
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Default Re: Auto trans problems.. loose input shaft nut?

Thanks for the tip. All back together now and the transmission shifts fine and I have reverse again.

I wanted to point out that the generation of Saturns from 97 and up can not gain enough clearance for the lower trans mount stud when the engine is jacked up. The A/T is jacked up as high as it can go and the casting is contacting the subframe and there is still not enough clearance for the lower mount stud to clear. I had to use a cutoff wheel on the lower mount stud to shorten it.

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Old 12-27-2005, 08:34 AM   #7
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Default Re: Auto trans problems.. loose input shaft nut?

The transmission mount stud doesn't need to clear by jacking up the tranny. Jack up the tranny, take mount loose from the tranny, then you can tilt the mount and get it out. Here's a link to a video (Thanks Low Saturn!) that will give you the idea.

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Old 12-27-2005, 09:54 AM   #8
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Default Re: Auto trans problems.. loose input shaft nut?

Quote:
>Fm tgferg<
I wanted to point out that the generation of Saturns from 97 and up can not gain enough clearance for the lower trans mount stud when the engine is jacked up. The A/T is jacked up as high as it can go and the casting is contacting the subframe and there is still not enough clearance for the lower mount stud to clear.
That was the very problem I had with my '95SL2; It was necessary for me to fully lift the engine & transmission straight up. That was the only way I could get out, and replace, the lower transmission mount.

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Old 12-27-2005, 12:45 PM   #9
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Default Re: Auto trans problems.. loose input shaft nut?

Photo of the clearance issue.

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Old 12-27-2005, 01:06 PM   #10
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Default Re: Auto trans problems.. loose input shaft nut?

Ditto
Quote:
Originally Posted by Luke
That was the very problem I had with my '95SL2; It was necessary for me to fully lift the engine & transmission straight up. That was the only way I could get out, and replace, the lower transmission mount.

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Old 12-27-2005, 09:33 PM   #11
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Default Re: Auto trans problems.. loose input shaft nut?

swap to manual trans. that will fix your problems.

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Old 12-28-2005, 12:47 PM   #12
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Default Re: Auto trans problems.. loose input shaft nut?

Quote:
Originally Posted by tgferg67global
How do you hold the input shaft from turning when installing the new nut "without" buying the $150 special tool?
the tech manual told me to put the gearbox into 2 different gears simultaneously while torquing both the input and output shaft nuts. (easy to do when the unit is sitting on your workbench) they are single use items and come in the rebuild kit. oh, crap, you have the auto. i don't know if you can put it into 2 gears like the manual gearbox? got me, dude...


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