Thread: Speedo reducer what's it for
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Old 10-18-2019, 01:34 AM
BCreekDave BCreekDave is online now
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There are charts from GM that show when a particular combination of trans and wheel-tire size got a particular part number reducer. The part number is not one of the numbers you listed. you have to do a bit of google searching to cross reference the GM part number to the reduction number, in your case the .9444.

Here's an example for a 1970 Camaro,Chevelle, Nova 4 speed cars:

http://www.gmpartswiki.com/getpage?pageid=12662

If you plan on actually using it, you would be advised to open it up and clean out and re-pack the grease. It dries out over time.
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Last edited by BCreekDave; 10-18-2019 at 01:37 AM.
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