ACDelco 3987921 GM Original Equipment Automatic Transmission Speedometer Driven Gear
Key features
- •GM-recommended replacement part for your GM vehicle's original factory component
- •Offering the quality, reliability, and durability of GM OE
- •Manufactured to GM Original Equipment specifications for fit, form, and function
BrandACDelco
CategoryDrive Gear
Warranty24 Month / Unlimited Mile Limited Warranty on parts sold on or after 04/01/18. (Parts Only) Please see ACDelco.com for more details.
ACDelco 3987921 GM Original Equipment Automatic Transmission Speedometer Driven Gear
List Price: $16.74$15.07DEALYou Save: $1.67 (10%)
Free shippingFree Returns – 30 daysFree Order CancellationSecure Payment2–3 Days DeliveryGet It June 23, 2026In Stock (4)No marketing spamNo account requiredFulfilment by FedEx / Amazon / UPS / ShipwirePayPal / Card Buyer Protection
Customer Reviews
Reviews sourced from verified Amazon purchasers4.7
out of 5
Based on 4 reviews
5★
75%
4★
25%
3★
0%
2★
0%
1★
0%
Five Stars
James•June 26, 2017
Exactly the part I needed. Fit my Muncie four speed perfectly.
Good Deal if Right Part??
zinger•June 11, 2017
I gave this 5 stars because it is a quality part and getting two for the price was a great deal. In the end I didn't use either of them as it was the wrong part. I didn't return as my fault and I will hang onto them to give away or use in the future if I change the transmission. I went to a transmission dealer and found out the right number of teeth and color of the gear I needed, there is a bunch of combinations. Anyway once I got the right gear everything worked just fine.
Four Stars
Amazon Customer•January 13, 2017
Worked well, bonus an extra one.
ACDelco 3987921 speedometer Drive Gear
Rodger Fairfield•July 19, 2014
The part provided was fine and works well however , this part goes in a transmission and only uses one and I had to buy two " package of two ". I'll likely never use the other gear and isn't an item many people can ever use. After this purchase I found the same item at " Rock Auto " where I could buy just one and was less expensive for the part and for shipping. So after this I'll likely go to Rock Auto before Amazon. Don't know if this helps but , thanks for asking.........Rodger........
