Napa chassis used to be made by Dana, and was a quality part.
I had an ambulance that the county put Napa ball joints in.
Drove it 10 miles to the shop for an alignment, and both lowers were moving.
Put Moog in it, and done. That’s why they call it the problem solver.
All metal internals on the fulcrums on Moog.
Many other manufacturers are using plastic in the ball joints so they don’t bind, and they don’t hold up.
In a heavy duty application there is nothing better, I see this stuff everyday.
You get good and bad with everything, but I’ve seen people never grease a Moog part and 2 years later it’s still intact.
The biggest drawback is cost, their not cheap.
I’ve put Moog in my junk for over 20 years and never ever wore a part out.
Now I have replaced a few things over the years under warranty, though it’s normally due to never greasing the parts.
