⚡ Shift Like a Pro: Dominate 4th Gear with Unrivaled Control!
The Sonnax 4th Gear Super Hold Dual Servo Kit (77767K) enhances GM 4L60E-series transmissions by increasing apply surface area by 40%, improving 4th gear holding power and shift quality. Compatible with all 4L60, 4L60E, 4L65E, 4L70E, and TH700R4 models from 1982 onward, this precision-machined kit addresses common shift issues and band failures in performance vehicles. Easy to install in-vehicle and backed by a 1-year warranty, it’s the ultimate upgrade for drivers demanding reliability and smooth gear transitions.
| Manufacturer | LANHO AUTO PARTS |
| Brand | 1409KMT |
| Model | KMT-OT001426 |
| Item Weight | 1.23 pounds |
| Package Dimensions | 3.82 x 3.62 x 2.52 inches |
| Country of Origin | China |
| Item model number | KMT-OT001426 |
| Exterior | Machined |
| Manufacturer Part Number | KMT-OT001426 |
B**0
Great upgrade
Great and easy upgrade for the 4l60E. Easy to install and you will notice the difference immediately
A**R
This is a KNOCK OFF.
I verified with the original manufacturer. Do not trust the information on this listing.
R**.
Doesn’t fit
The seals were the wrong size causing the servo not to travel correctly. In my case it’s a 10 hour job to remove them and I neither have the time or inclination to do that removal in triple digit heat.
L**D
NOT a SONNAX part,JUNK!!
This is a Chinese copy. It will probably work, but don't know yet. Just so you know what you're gettingUpdate; This part never did work, caused several hours of diagnosis and possible damage to the transmission band. The picture shows what it looked like after 10 miles in my transmission
Trustpilot
4 days ago
1 week ago
