Originally Posted by
JohnRW
You've been building that Volvo for many years, and while you've never turned a lap, you seem to have all sorts of problems with it that others don't. Dana 30 rear end, big axle tubes out each side, holds lots of oil and has a reasonably big surface area to dump some heat. When I was racing a 142 with a Dana 30 solid axle, I had all sorts of issues (gearbox, engine, etc) but never a problem with the diff. None of the other Volvo guys with that same axle seem to have overheating diff issues. A friend with a "flat-nosed turbo" 240 rally car had diff & axle issues, but he was running ballistic power levels in a difficult (pro rally) environment.