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Street Race Truck More... The Toolbox
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$7.99
GM 3987921 Red 21 Tooth Speedometer Gear
GM 3987921 Red 21 Tooth Speedometer Gear

GM 3987921 Red 21 Tooth Speedometer Gear

21 Tooth Count

1 Review | 1 Answered Question
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GM 3987921 Red 21 Tooth Speedometer Gear
GM 3987921 Red 21 Tooth Speedometer Gear
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Part # 92614446
$7.99
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Details

Speedometer Gear Color:
Red
MFG. Part #:
3987921
Notes:
Must be used with a 1.84" OD Drive Gear
Sold in Quantity:
Each
Tooth Count:
21

Info

Transmission speedo gear.  Correct red color and 21 tooth design.  Exact fit for all automatic powerglide , turbo 350 and saginaw or muncie manual transmissions.  Will not work for automatic turbo 400 transmissions. Factory match for 3.31 rear axle ratio with o/e size tires.  Replaces original GM part number 3987921.   

Notes

To check your Drive Gear designation/size to determine if you have a 1.84 or a 1.76 gear, from outside looking through the hole/opening, use a cardboard gage and measure the width.  The 1.84 is 0.610" wide and the 1.76 is 0.531" wide and both have a 8 tooth count.

Some parts are not legal for use in California or other states with similar laws/regulations

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