Done them both many times with a stock FJ Cruiser and an FZJ-80. You should have no problems with a stock vehicle, just make certain your brakes are good and you have solid 4WD for the multi-point hairpins on Black Bear.
I can tell you ever year it gets easier my first BBP in 1990 was actually exciting, very narrow, required driver skills and I only saw one other vehicle. Today its a freeway and brings a ton of stock rental jeep driven by many with little to no experience. Today BBP is IMO but still one of the best trail views anywhere.
If not maintained, mountain trails, especially the shelf road design get worse with time. Stuff washes on to the trail from the high side. Stuff falls away on the low side. Plus ruts down the center. Then there's natures bulldozer, the avalanche.