And the floor/exhaust pipe/wiring/.....
I have seen a couple where the prop has let go completely at speed, on one of them the floor in the drivers footwell was about 2 inches from the bottom of the pedals where the prop had been trying to get in when the UJ on the front of the transfer box let go at about 50mph leaving the prop thrashing round underneath
Another one let go right in front of me just outside work, there was this almighty bang and suddenly the back end of the vehicle leapt a couple of feet in the air, the rear prop had let go at the handbrake drum and dug in, neatly catching a seam in the road, pole vaulting the rear of the vehicle and then wiping out the whole of the rear section of the exhaust and various other bits and pieces. Didn't do the prop much good either
As Les said if in doubt replace it - the alternative may be expensive....! (and dangerous)
Another first class post Les