

⚙️ Upgrade your ride with genuine precision—because your GM deserves the best.
The GM Genuine Parts 3860347 Speedometer Driven Gear is a precision-engineered, OE-spec replacement part made from durable Delrin material. Manufactured in the USA and rigorously tested to meet GM’s original equipment standards, it ensures perfect fit and reliable performance for your GM vehicle’s automatic transmission system.





| Brand | GM GENUINE PARTS |
| Material | Delrin |
| Item dimensions L x W x H | 2.8 x 1.5 x 1.1 inches |
| Item Weight | 0.01 Pounds |
| UPC | 036666069853 |
| Global Trade Identification Number | 00036666069853 |
| Manufacturer | AC Delco |
| Model | ACDelco - Automatic Trans (Slp) (3860347) |
| Item Weight | 0.16 ounces |
| Product Dimensions | 2.8 x 1.5 x 1.1 inches |
| Item model number | 3860347 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 03860347 |
| OEM Part Number | 03860347 |
P**R
As advertised
Great part. Unfortunately I ordered the wrong tooth count
W**S
TH350
Just what I needed for my TH350 with 3.73 gears 28.5 tall tires to correct my speedometer. Good seller, fast shipping! Thank You!
R**.
Worked perfect
Changed rear end gears in my 1973 camaro Th350 from 2.73 to 3.73. Quick fix that fixed the speedo.
G**.
Jumping speedometer
The molding left lines and it will make your speedometer jump.
D**Y
works well
fit good and worked
A**A
Good value
worked well, good fit, Great alternative to OEM part, fast ship, packed well, would recommend to others.
J**.
Five Stars
fit nicley quick delivery
M**J
If it works it's OK
Just a tip. This will not bring a Saginaw 4 speed around when as a replacement for a white 19 tooth gear.It installed easily but doesn't engage the drive gear. The speedo went dead.It's not fault of this gear. But I thought I would warn anyone who might think this can be dropped in a Saginaw to compensate for 3.73 gears without other internal transmission modifications. It won't work.
Trustpilot
2 weeks ago
3 weeks ago