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What engine does it have, and what market was the car built for?
Inline four cylinder? Inline six cylinder? V6?
If it has the inline six cylinder (as most 960s do), it would have an AW transmission. Not the AW70/71/72 that the four cylinders or the V6 would have gotten... altho I believe some/all/most of the European V6s and turbo 4s got the ZF transmission instead of the AW unit.
When you say the transmission fails, do you mean it merely downshifts into 3rd gear? Or does it slip into neutral?
Assuming you've got the inline six cylinder, the first thing to check would be the trouble codes. Check out the FAQ for instructions on how to pull codes (might as well check both the engine and transmission computers). Since this transmission is electronically controlled, if there were no codes I'd suspect a speed sensor of some sort or whatever solenoid is used to engage 4th gear. Or... if the transmission computer has never been replaced/repaired, perhaps that's bad. You would have a sport/winter/normal mode button near the shifter if this is the transmission you have.
With the AW70/AW71/AW72 units, the overdrive relay would be the first suspect, the overdrive solenoid would be the second. The shifter would have an overdrive button on it if you had this transmission.
The ZF transmission would be indicated if you had a PRND321 shift pattern and were missing an overdrive button and a shift mode button.
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alex
'89 765T, 171,1xx mi
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