Transfer Case Noise

['97 V8]

what series is the stock f-150 front driveshaft u-joint at the case?

 

[IZwack]

The fronts are almost always 1310s but measure to be sure (the "groove", "notch" or "seat" between two of the yoke's arms) .. 1310 and 1350 have the same cap diameters but their overall unit diameters are different:

[cap diam] [unit diam] -- [series]
1-1/8" 3-1/4" -- 1310
1-1/8" 3-5/8" -- 1330
1-3/16" 3-5/8" -- 1350
1-3/16" 4-3/16" -- 1410

(Notice that the 1330 and 1350 have the same overall unit diameter but different cap diameters, and visa versa between 1350 and 1410)