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⚙️ Upgrade your GM with genuine precision — don’t settle for less!
The GM Genuine Parts 3860347 Gear is a precision-engineered, GM-recommended replacement part made from durable Delrin material. Manufactured in the USA, it guarantees perfect fit and function for GM vehicles, backed by a 24-month unlimited mile warranty, ensuring reliability and peace of mind for your drivetrain needs.





| ASIN | B0016I0LQS |
| Best Sellers Rank | #630,700 in Automotive ( See Top 100 in Automotive ) #47 in Automotive Replacement Automatic Drive Gear Bearings |
| Brand | GM GENUINE PARTS |
| Brand Name | GM GENUINE PARTS |
| Customer Reviews | 4.5 out of 5 stars 103 Reviews |
| Global Trade Identification Number | 00036666069853 |
| Included Components | ACDelco - Automatic Trans (Slp) (3860347) |
| Item Dimensions | 2.8 x 1.5 x 1.1 inches |
| Item Type Name | ACDelco - Automatic Trans (Slp) (3860347) |
| Item Weight | 4.54 g |
| Item dimensions L x W x H | 2.8 x 1.5 x 1.1 inches |
| Manufacturer | AC Delco |
| Material | Delrin |
| Material Type | Delrin |
| Model | 3860347 |
| Number of Items | 1 |
| Part Number | 03860347 |
| Thread Style | Unc |
| Thread Type | Unc |
| UPC | 036666069853 |
| Unit Count | 1 Count |
| Warranty Description | 24 Month / Unlimited Mile Limited Warranty on parts sold on or after 04/01/18. (Parts Only) Please see ACDelco.com for more details. |
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.
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!
P**R
As advertised
Great part. Unfortunately I ordered the wrong tooth count
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.
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.
S**N
Stock GMC parts
Fits like its supposed to and works well
T**N
Speed gear
Worked great
M**O
Fits good
Good fitting part
B**R
Works
Was what I needed to calibrate my speedo would recommend finding a web site that’s calculates the size and teeth needed lots out there google it
J**R
Brisé
Arrivé briser
Trustpilot
2 months ago
4 days ago