3.9 R200

I am currently swapping out my driveline from a 4 speed to 5 speed as well as changing the diff from the stock '73 Z 3.364 R180 to a '82 ZX 3.9 R200. In case you never looked inside the diff here it is. The stamping on the ring gear gives all the info: JH 39:10 DQ 1 11 25

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