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half shafts and u-joints

fordgtfordgtMember
From Jack's previous posts on this subject, I looked at at my halfshaft and saw the shiney area under the clip. I ordered new u-joints based on the assumption ( I know, I know what happens when you assume) that I have owned this car since 1985, that I have never done anything to them other than clean, paint and grease them. I ordered 4 new OEM replacement u-joints. After removal I see one side clearly has the word "SPICER" cast in all of the u-joint ends. The other side does not have anything cast in it. I am assuming (again) that the previous owner must have changed one halfshaft. Is there a problem running 2 different types of halfshafts? (i.e. an OEM and one that takes "Spicer" u-joints?

okay, now I am really confused, I took out my caliper and measured the openings in both halfshafts = 1.25" the new u-joints also measure 1.25" Does anyone have the diameter of OEM u-joints Jack mentioned in an earlier post that they were bigger than Spicers

thanks

Gary #06984


[This message has been edited by fordgt (edited 04-25-2004).]
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bosswrenchbosswrenchMember
My Spicer u-joints, for F-350 and F-500 Ford trucks, mic at 1.18" OD on the cups while OEM u-joints mic at 1.261"OD. The assemblies are also 0.035" longer for OEMs than for Spicers so no mixing of parts is possible- the OEM yokes are wider with bigger holes. I see no problem using two different half-shafts in a street car, except for the obvious requirement of remembering which is which when parts are needed. But if I understand your question, mixing a Spicer male spline-section to an OEM female spline-section might cause some difficulties since presumably one is SAE and one is metric. I guess it would depend on whether the male & female splines in the slip-coupling fit correctly; too loose and the splines could tear out while too tight would prevent the halfshaft from telescoping under driving conditions. Congratulations- this possiblity has never been brought up before!
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