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It looks like the prior owner replaced the passenger side half shaft & u-joints with a spicer unit, but the driver side looks original. Also, the driver side is missing the grease cover.
1) Is it ok to run 2 different halfshafts? The newer one seems a bit beefier and possibly heavier. Seems like it might not be a good idea.
2) Can a grease plug be re-installed without removing the half shaft? Or otherwise plugged until I rebuild the entire rear suspension.

I plan on doing everything at once in a few months since it's all got to come out. Just want to safely drive the car a few miles here & there until then.

Thanks,
John
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quote:
Originally posted by LF - TP 2511:
I can think of no problems arising from using different half shafts.

I am unclear as to what you are referring to when you say “grease plug” or “grease cover “. Can you please clarify so we can better understand the question and provide a correct answer?

Larry


At the inside end of the half shaft it is open to the shaft splines. What is missing I think it's called a yoke grease plug, but maybe not. The Spicer one is welded closed. Hope this explains it. Without it, the splines are exposed and the grease just slings out.
Trusty, that disc-shaped steel dust plug cannot reliably be installed while the halfshaft is in place, but driving without it- NOT on dirt roads or during monsoon rain- will not hurt anything. It's there to keep dirt & water out of the slip-joint and chassis grease inside wher it doesn't make a mess. Under the screw-on collar should be a nice greasy felt ring, and the whole assembly should be greased thru it's zerk fitting once in a while, as should the u-joints themselves if yours have zerks.

While it's out & cleaned up, check the splines for twist and sticking- this is the direct result of decades of drag-race starts from wannabe racers. I've seen some halfshafts that are almost frozen. Some halfshaft yokes are too loose for replacement u-joints to press in, and should be discarded. Some vendors have usable parts for OEM and Spicer halfshaftss.

OEM halfshafts use huge #1410 u-joints. A replacement Pantera halfshaft made by Spicer was popular in the '80s and uses intermediate #1350 size u-joints that are popular for racing, as the whole assembly is lighter but plenty strong. Spicer's U.S-made halfshafts and u-joints were lighter, smaller and cheaper than OEMs (before vendors found cheap #1410 replacements; they were once around $75 each!) #1350s interchange with Ford F-500 truck units.'70s Corvettes and Camaros use even smaller #1310 u-joints, which do fail occasionally.

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