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Just out of curiosity... wehre in the manual does it say to use 20/50 oil? I used that in my last gearbox and wasted a bearing... not sure if the oil caused it or not though.
But keeping in mind that multiweight oil is that way to act like thinner oil (20wt) when cold, and act more like 50wt when the engine is warmed up. A transmission never gets that hot, so that oil is acting like the 20wt in there all the time... and if you check again, you'll probably find that VOlvo recommended straight 30wt engine oil. I personally think thats a bit thin too, so I always go with straight 40wt non-detergent as a compromise, and I've never had a problem with it....and never never never add any sort of slippery additives.
Although...maybe someone else can help with this one:
I posted a month or two about the slipping automatic on my Cadillac, and folks thoughs on additives. General consensus was that it was time for a rebuild. Of course, the additives are cheaper than a new trannie, so I gave it a try... "transEx" to be specific... the kind in the steel can engineered to stop slippage. It worked a LOT better than I expected... THe car now drives almost normally.
I wonder if anyone has thoughts about using that product or something similar in a overdrive Volvo box...? I sure wouldn't try it without some good advice from someone more knowledgeable than myself.
Admittedly though, it sounds like you have other problems, but were I you, I'd change out the fluid first and see if it helps.
-Matt
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-Matt '70 145s, '65 1800s, '66 122s wagon, others inc. '53 XK120 FHC
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