Well I've never had to do the u-joints but thread locker sounds like a good idea. Red vs blue, I think one is more permanent than the other, but you have to check which. I'd probably use the one Volvo specifies.... For the 6 studs/nuts that hold the drive on, I always use OMC gasket sealer (Permatex Aviation Seal I think is the more commonly available version) and I have never had trouble with getting these off after a 6 month season in the water. For greasing the Ujoints I use Pennzoil Marine trailer wheel bearing grease, same if you have a grease-able gimble bearing. For the driveshaft splines themselves, I use OMC Triple Guard Grease. I also use that on the part of the bellows that seals up against the bearing carrier. All this is as per the factory OMC shop manual.
If you do this once a season, combined with changing the drive oil/drain & fill gaskets you will get a very long lifespan out of your drive system, and avoid problems with the ujoints, gimble bearing and other issues like the drive not coming off because it was left on too long.
Always check the drive oil for water (milky appearance) at the end of each season, and check for wear particles on the magnetic drain plug.
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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