The thing is called the gear housing. The dealer sells the gears for $7.00 The housing will cost about $15.00. At least for a 700R4.
If you need to calculate the speed use the calculator at this website. www.tciauto.com Check under the Transmission and Speedo gear links. The part numbers for the housing and the gears are availble at their site. There are two housing. You probably have the incorrect housing for the gear. The larger tooth gears have a larger diameter shaft than smaller toothed gears.
If there is not a dealer nearby try here http://www.gmpartsdirect.com/
That site will give you the dealer cost.
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