I had that issue when I first got my car. The black VSS gear was mangled up, so I went to the dealer and they gave me a new one, but it was red. From TH-400/350 stuff I thought color corresponed to gear #, but thought what the hell. put it on, worked like 2 days, then stopped. Diff gear popped off. Pulled trans, put it all back together, same shit. Like a week later speedo quit again. Diff gear popped off. I was ready to weld nubs to hold it on, but instead went to dealer and told them I needed a black speedo gear, had the part # at the time. Finally got a hold of one, and haven't had a problem since, and the speedo is the correct range. I don't know if they just have it listed wrong or what, but that was the issue I had.

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'95 GS w/ t3/t4b
FMIC, diy piping & RFL BOV
MS2-Extra Fuel&Spark
50 lb/hr Holley injectors w/ 1:1 RRFPR
JE 8.8:1 dish w/ Hastings Rings
Eagle Rods w/ ARP bolts
ARP Head studs
Mild port/polish head
3" custom DP/cat section, 3" PIT catback
dual MBC - 12 psi / 20psi