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Thanks Ken,
I have some information from Volvo which was written around (my guess) 1992-93, which states that the tranny on the original GLT is the AW-42. (Of course, that didn't tell me if the tranny was to change in later years, hence the original question. You & John have sorted me out there, ta.)
I guess the AW-42 that they (volvo) talk about and your AW 50-42 are the same thing. What's the '50' nomenclature?.
Any further info on the trannies and year variations is appreciated, I will put it up at my site for anyone who is interested, and it will certainly help this guy in Hawaii to get his bearings.
Now that I know that the 850 tranny was always Aisin - Warner, the thing that I want to know is why the apparent variation in reliability between earlier and later models?
Kino's survey reports 1993, 74%, with 50 people responding; 1994, 21%, 113 people; 1995, 33%, 101; 1996, 12%, 76; 1997, 17%, 28 and 1998 13%, 66. The 1993 result is particularly unnerving. (though it depends on how you see the numbers: 37, 23, 33, 9, 4 and 9 are the roughly raw numbers of respondents saying they had tranny failure, making all three first years look pretty bad...)
Just my 2c worth, but there may be a lot of factors causing the unreliability (seen in Kino's survey) for the AW-42. A few possible causes:
* Difference in time elapsed between years surveyed;
* individual variation in the way the transmission is used/car driven;
* Variations in maintenance. (As more people/dealerships/whatever became/become aware that it is important to change ATF, boxes are less prone to failure? Anyone know about TSB's on ATF changes/when they were released?)
* might the probs have anything to do with the mods that you speak of? On the surface the mods, being just sensors, sound too trivial to do that, but the fact that they were done might imply some more significant modifications to the AW-42 during its' life on the 850? Or am I totally up the wrong tree and was it pretty much the same box all the time???
And (sorry for the 61 questions) I wonder whether the 960's AW-30's were prone to such failure as well? (or was that RWD?)
I'll kill this rant before it goes on any longer! Thanks for your help
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