I have a 76 Chevy 3 quarter ton and today after a bit of 4x4ing my engine started knocking on the way down any ideas on whats wrong?

I have a 76 Chevy 3 quarter ton and today after a bit of 4x4ing my engine started knocking on the way down any ideas on whats wrong?
If the knock is coming from down deep in the engine you may have some worn out connecting rod bearings and or main bearings. This could be from high mileage, abuse, lack of oil changes or possible oil starvation from steep angles during a bit of 4+4ing. The engine may continue to run okay for many miles if you nurse it. There is no quick fix for this. An engine rebuild would be a cure for that condition. Installing a good used engine would be another way out, probably cheaper than a rebuild.


ADD-ON: I once developed several knocks in my engine when I over-revved(?) it during a missed shift. It went over the red line with the result of a stretched timing chain and a couple of valves through the top a couple of pistons. I was able to 'nurse' it home from the beach but a re-build was absolutely necessary.