3 years ago I replaced my OEM rear driveshaft( 2004 FX4) with a new driveshaft . The original had "non-replacable" u-joints. The new shaft I put on back then ( Ford part # 5L3Z-4602-HA ) has u-joints that can be replaced. Well now I have a u-joint starting to squeak and need to replace it. Does anyone have a part # for a u-joint that will fit the above driveshaft? Any help much appreciated. Thanks.