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Old 12-22-2005, 12:38 AM   #1
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dgboult is on a distinguished road
Join Date: Dec 2005
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Mad 1999 SL-1 auto trans problems

I have a 1999 SL-1 with a automatic trans. The car has 90,000 miles on it and until about a few months back it ran fine. The first problem was the reverse slam about 6 months ago then about two months ago it started shifting extremely hard up and down shifts, so I replaced the valve body with one from Valve body express (Yes I also changed the fluid and filter at that time). No engine light ever came on. The car ran great for a month, and now the car will sometimes feel like it will not shift out of 3rd or 4th when coming to a stop, or sometimes it will shift down so hard that it feels like I just ran over something. I notice it does it more frequent of up or down hill grades. To top it all off the engine service light will come on and go off sometimes. I borrowed one of my friends scanners and read the codes on one of the times the engine light was on and I got:

PO 732 - Gear 2 Incorrect ratio
PO 733 - Gear 3 Incorrect ratio
PO 783 - 3-4 shift malfunction

To me it sounds like somthing electrical because it only does it sometimes and the engine light will go on and off. Also I have not tightend the input shaft nut yet. Could this be causing it?
My manuals says the line pressure accuator, but I thought a new one came with the new valve body.
Sorry for all the writing I'm just trying to help you guys narrow down my problem. Any help would be greatly appreciated.
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