U-joint help

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i have a 98 k1500 f44 option with a 14 bolt sf, need to replace u-joints. Parts store couldn't tell me which part number to use 331 or 355. Said one is for an aluminum yoke and the other for a steel yoke. Can't anyone help? And are all the u joints the same on the front shaft as well?
 

TylerZ281500

Yukon Ridin High
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they are the same its a 1330 joint the difference is the grease fitting on them. either should work and ive never figured out moog crappy numbering system, i told my moog rep that before proclaiming my htred for moogs garbage and proceeded to show him why.
 
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I bought both u joints, opened them up they are identical. Only difference is that one comes with 4 big outer pins and the other has two smaller outer pins and two inner c clips
 
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