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Old 10-18-2019, 12:56 AM
cdn454LS6 cdn454LS6 is offline
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Default Speedo reducer what's it for

Anybody know what this reducer is for ?
666F V8
.9444W

Thanks for your help
Ken
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Old 10-18-2019, 01:29 AM
McCune McCune is offline
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Low Rear Gear cars.
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Old 10-18-2019, 01:31 AM
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My Guess later model Truck after 1970 with 4.10 gear ratio.
Checked eBay completed items and one sold for $64 but had no info at all for what it was for.
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Old 10-18-2019, 01:34 AM
BCreekDave BCreekDave is offline
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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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Old 10-18-2019, 03:18 AM
cdn454LS6 cdn454LS6 is offline
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I found one guy selling a reducer
and claiming it's for LS6 410 rear
666F V8
.8241C
maybe mine is for 456 rear ?
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Old 10-18-2019, 02:32 PM
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A friend here in Calgary gave me one that I used in the green 4:10 gear car I recently finished. They work well if you know what gear conversion they were intended for.
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Old 10-18-2019, 08:12 PM
L78steve L78steve is offline
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If you repack it with grease use a light grease. Otherwise the load can snap the tab on the drive gear clip inside the tail housing.
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Old 10-19-2019, 02:39 AM
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Are these also used on the automatic cars, mine came with 4:10 gears but someone put in 3:73 gears. If I return to the factory gears I will have to get a reducer.Thanks
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Old 10-19-2019, 10:21 AM
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I have a box full of those, there was two different kinds. Mostly for trucks.
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Old 10-19-2019, 11:33 AM
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Post Speedo Reducer...

Quote:
Originally Posted by hiperf406 View Post
Are these also used on the automatic cars, mine came with 4:10 gears but someone put in 3:73 gears. If I return to the factory gears I will have to get a reducer.Thanks
Yes auto cars got these as well.
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