Mr. Volvo does a horrible job 90% of the time. Sometimes outright LYING to their customers.
Maybe they just shimmed your starter for you?

and had a bad ring gear laying around.
They told my friend with a 1980 240 DL Automatic that they were going to replace the transmission, they just added transmission oil and CHARGED HIM FOR A TRANSMISSION SWAP. I looked underneath, the bolts on transmission to bellhousing to block, none were touched, and transmission showed no signs of having been touched, at all, covered in road grime in same way as everything else under car.
We went back and got them to confess, got him a partial refund, that's not all we got, we got a nice threat of bodily harm if we were to come back.
Thanks Mr. Volvo, or should I say, Mr. Asshole.
huh? thats ridiculious! i've never had any bad luck with them and ive had them do quite a bit to my car! I've heard a few other things about them but so far so good for me! but i guess from now on im gonna check everything after I leave. the only reason I go there is because they are the cheapest and seem to do a good job.