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⚙️ Upgrade your ride with GM Genuine Parts — because your speedometer deserves the best!
The GM Genuine Parts 3987918 Speedo Driven Gear is a GM-recommended, factory-spec replacement part made from durable nylon. Designed and tested to meet original equipment standards, it ensures precise fit, reliable performance, and longevity for your GM vehicle’s speedometer system. Trusted by professionals and backed by GM, this gear offers seamless installation and consistent accuracy.
| ASIN | B000J6Z9TC |
| Best Sellers Rank | #1,134,063 in Automotive ( See Top 100 in Automotive ) #95 in Automotive Replacement Automatic Drive Gear Bearings |
| Brand | GM GENUINE PARTS |
| Customer Reviews | 4.4 4.4 out of 5 stars (40) |
| Date First Available | February 13, 2005 |
| Global Trade Identification Number | 00036666071368 |
| Is Discontinued By Manufacturer | Yes |
| Item Weight | 0.32 ounces |
| Item dimensions L x W x H | 2.9 x 2.5 x 1.1 inches |
| Item model number | 3987918 |
| Manufacturer | ACDelco |
| Manufacturer Part Number | 03987918 |
| Material | Nylon |
| Model | ACDelco - Automatic Trans (Slp) (3987918) |
| OEM Part Number | 03987918 |
| Product Dimensions | 2.9 x 2.5 x 1.1 inches |
| UPC | 036666071368 |
H**R
Fixed the issue
Fixed the issue, good value
M**H
Perfect replacement exactly as original.
Perfect replacement. Arrived quickly and was an exact representation of the original part. Exactly what I needed.
A**R
part knowledge
End of speedo cable that hooks into 700-4 transmission on my S-10 chassis. Gear was stripped and that turns the speedometer in the truck.
N**N
Used a GPS based speedometer app on a smart phone to test
My speedo in my 1972 Corvette read about 10mph fast. I had a 21 tooth gear and went to this 18 tooth gear, speedo now reads within 3mph. Used a GPS based speedometer app on a smart phone to test.
E**I
just what I needed.
Now my speedo on my Cobra shows the right speed. Got two gears instead of one. Well , have a spare now.
C**N
Exactly What I Needed
My GMC Van needs a mechanical speedometer driven gear, Couldn't believe it....there it was....Same color and all...wow... The color is very important 'cause each of the many gears has differnt number of teeth and the color determines the number of teeth. Thanks good job
L**O
Five Stars
acdelco 3987918 drive gear was the gear I need
D**Y
Five Stars
Worked great. Direct replacement of oem
Trustpilot
3 weeks ago
5 days ago