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The basics of the kit you found is the idea behind the Dynatrac Superduty Kit. It replaces the hub with a new spindle and replaceable serviceable bearings. Jack up the truck and pull the wheel and see if you have play in the hub by moving it up and down. Its pretty heavy as is so really press against it. If you have movement or feels loose, check to make sure your ball joints are also not bad.
They aren't the spring eye bushings, but a plastic isolator between the spring eye and long leaf. Mine were squeaking, rattling, and thumping. Found they were worn through, replacing these fixed it.
If it turns out it is your shock rubber mount bushings if your shocks are the stock ones you might just think about replacing them. I replaced my stock shocks on mine and they were beat, not totally but it needed some replacements(Bilstiens). By the way, about 3 weeks ago I replaced my wifes shocks(Monroes) on her Expy, drivers side rear top shock mount bushing was bad and when you pushed on the rear of the suv you could hear it clunking.
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