Well... your car is suffering from neglected maintenance. I've heard it said once, that it's the cheap man who ends up spending the most... deferring maintenance causes a small problem to affect other systems and costing far more money.
Moving on.
Angle gear (bevel gear, whatever) is known for leaks, and Volvo published a TNN on how to re-seal it. Parts cost under $200, though I recommend replacing the collar, so, closer to $300. Fix it and keep the AWD. Otherwise, what you've done is create a big, slow, softly sprung version of every V70 out there and killed the car's value. Hardly an improvement. Sure, you saved the cost of an angle gear repair, and cost yourself more.
https://www.volvoxc.com/forums/showt...d-modification
Fix the PCV system. $300 in parts, a DIY job. Neglect this and you blow cam seals, oh, wait, that's happened...maybe.
Have the timing belt done, or, again, DIY. Under $200 in parts. Neglecting this leads to a totaled engine. Not good. Do your cam seals really need replacing? Or is your failed PCV system pushing oil past them? You should be able to physically see if the seal is in place, or pushed out. You won't know until you're in there. I've had a Volvo dealer tell me that the cam seals needed replacing. They didn't. I checked. That was 80,000 miles ago. Cam seals are still good.
Springs can break. Lesjofors makes new ones. Not expensive but a pain to install the rears. Leave that to a mechanic. Fronts are easy, but rears are hard.
Look, don't worry about your turbo going and making the car worthless. To be very direct: your car is worthless right now. I wouldn't give you $100 for it.
If you want to keep it, fix absolutely everything you just listed. Go price a new car, or even used, in today's market. You may decide that fixing this one is the cheapest option. But please, start taking better care of this one. Ignoring problems has created other, expensive problems.
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (130K, Michelin AS4, HPL 0W40)
2005 MB SL600 (58K Michelin AS4, Mobil 1 0W40)
2004 V70R (147K, six speed M66, HPL 5W40)
2004 XC90 (247K, HPL 0W30 Euro)
2002 V70-XC (300K, HPL 0W30 Euro)
2002 V70-T5 (230K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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