I have a front axle u-joint making a squealing noise on my 2000 f250. I want to replace them with some good grease-able ones. I'm really getting conflicting part numbers on different sites. When I look at spicer on one site it gives one number and then another site says that wont fit. Where is a good place to order these u-joints ? Also do I have to order the outer seal or is it reusable?
Thanks

 

Some sites say to use Spicer SPL55-4X. But amazon says they don't fit. Anybody use these on their front axle?