Well, truck makes a clunk when starting off and also squeals in granny or second gear going under 10 m. p. h. Seems the two U-joints are loose, the front one just a bit but teh back one thats hooked to the rear end seems quite loose. Job seems relatively straight forward. I was wondering if there was anything to watch out for. Are any brands good? Do I get the ones with zerk fittings or sealed ones. Seems I read once where the sealed ones were stronger, will they last any longer? Thanks!