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Re: C30 heavy duty rear axle top speed
The Gear Vendors OD's (I have 2-- one behind a TH350 and one behind a SM465) uses a speed signal generator inline with the speedo cable to create a voltage signal to the little computer brain as to when you are going fast enough to kick in the planetary gear OD which is about +/- 45 mph minimum, so that is something to keep in mind with the GV verses a manual OD.
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