Compression Ignition Addict
Join Date: Jul 2010
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I don't think the rear driveshaft u joints are a weak link. They are a 1410 series joint which is pretty strong. You can go to a 1480 u joint but thats completely overkill, and you'll need to get your shaft modified to use them.
Spicer and NEAPCO have greasable and permanent lube ujoints available.
Permanent sealed are usually stronger because the cross isn't drilled for grease passages. I prefer being able to grease them.
I can't remember the part numbers but they both have catalogs online.
My preference is NEAPCO because they are made in the USA. I found out after I replaced my rear ujoints with the Spicer Ones that only the caps are made in the USA the rest came from China.