I'm not as familiar with the 850 series as I should be, but the symptoms are usually related to a sticking governor assembly...Being a front wheel drive, IF they are still using the ZF 4HP18 or 22(Similar to Saab 9000 configuration) then the governor sticking is a strong possibility. Of course, Saab etc went to Aisin transmissions in the 900S from 1994, so in all probability Volvo followed suit? In which case, I know nothing about THEM
Sorry I can't help further.
JC
The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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