







⚙️ Lock in power, shift like a pro – don’t get left behind!
The Sonnax 4th Gear Super Hold Dual Servo Kit (77767K) delivers 40% more apply surface area to dramatically improve holding power and shift quality in GM 4L60, 4L60E, 4L65E, and 4L70E transmissions from 1982 onward. Designed to fix common 3-4 shift issues and band failures, this easy-to-install kit is a must-have upgrade for performance enthusiasts seeking reliable, smooth gear transitions backed by a 1-year warranty.
| 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 |
| 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
vor 1 Monat
vor 1 Monat