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Discussion Starter #1 (Edited)
Hey, I purchased a used tranny from a junkyard and cracked it open to swap my quafe LSD into it. I noticed there was a gear difference, also, a bearing fell apart when I pulled it apart. Ive done over 5 tranny cracks to throw in LSD for our MTX75 and this one was wierd as the bearings fell out of the plastic housing.

I need to know a couple of things and thanks in advance, its a huge help and greatly appreciated.

What is the difference between my old tranny YS4R-7002-NA
and the new replacement 1S4R-7002-NB
What are the driving effects?

Also, what part number for the bearing shown missing on the 1S4R?

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