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I used the Dana Spicer lifetime sealed units for mine. The guy I bought them from claimes they last a lot longer than the ones you can grease because they are sealed up and moisure can't get in there.
I think you can buy them out of LMC.... they sell Spicer rear end parts. I get them from a local Drivetrain shop in town. But of course, I only had to buy them because of my custom driveshaft my old spicers were still tight.
I used the Dana Spicer lifetime sealed units for mine. The guy I bought them from claimes they last a lot longer than the ones you can grease because they are sealed up and moisure can't get in there.
I am not sure about that. I thought the grease is what kept the moisture out.
The greasable vs. non-greasable is debatable. Sealed definintly keeps moisture and dirt out BUT if it gets in then it eats itself up.
Greaseable is good IF you keep it greased all the time. If you were 4-wheeling and crossing creeks I would want greasable so I could go home and regrease them to get water and dirt out IMO.
I've got greaseable on my f150 and non greasable on my f100. So, we'll see which one lasts longer in time
Center carrier bear on the drive shaft, just changed mine had to use a die grinder to get old bearing off! When you go to reinstall don't just hammer on you have to line up the bolt holes it can go on too far and then you cant get it to move back!