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4L60 4L60E 4L65E 4L70E Transmission 2nd Gear Super Hold Servo Kit Sonnax

4.7 4.7 out of 5 stars 39 ratings
$125.80
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Purchase options and add-ons

  • The Sonnax 2nd gear super hold servo kit 77911-03K for GM 4L60/4L60-E has 18% more apply area than the “Corvette” servo (largest OE) and maximizes holding power in 2nd gear with more positive 1-2 and 2-3 shifts.
  • Dual seals on the 2nd gear piston and separator ensure positive band apply/release and eliminate cross leaks
  • This servo is the perfect option when more holding power is desired without causing excessively harsh upshifts and downshifts
  • The included apply pin is longer than the longest OE pin, and has added seals to reduce leakage of 3rd and 4th gear oil pressure
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Frequently bought together

4L60 4L60E 4L65E 4L70E Transmission 2nd Gear Super Hold Servo Kit Sonnax
$125.80
Get it May 1 - 3
Only 20 left in stock - order soon.
Ships from and sold by MaxxIndustries.
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$41.24
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Product Description

4L60 4L60E 4L65E 4L70E Transmission 2nd gear super hold servo kit the Sonnax 2nd gear super hold servo kit 77911-03K for GM 4L60/4L60-E has 18% more apply area than the “Corvette” servo (largest OE) and maximizes holding power in 2nd gear with more positive 1-2 and 2-3 shifts. Dual seals on the 2nd gear piston and separator ensure positive band apply/release and eliminate cross leaks, which contribute to 2-4 band and 3-4 clutch failure. This servo is the perfect option when more holding power is desired without causing excessively harsh upshifts and downshifts. The included apply pin is longer than the longest OE pin, and has added seals to reduce leakage of 3rd and 4th gear oil pressure. For the ultimate servo combination in your 4L60/4L60-E, Sonnax recommends using the Sonnax 4th gear super hold servo 77767K with the Sonnax 2nd gear super hold servo kit 77911-03K.

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4L60 4L60E 4L65E 4L70E Transmission 2nd Gear Super Hold Servo Kit Sonnax

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Price$125.80$49.95$28.50$25.38$122.36$39.99
Delivery
Get it May 1 - 3
Get it as soon as Friday, May 3
Get it as soon as Friday, May 3
Get it May 8 - 13
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Get it as soon as Friday, May 3
Customer Ratings
4.74.7 out of 5 stars39
5.05.0 out of 5 stars3
4.14.1 out of 5 stars33
4.74.7 out of 5 stars131
5.05.0 out of 5 stars3
4.44.4 out of 5 stars21
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Customer reviews

4.7 out of 5 stars
4.7 out of 5
39 global ratings

Customers say

Customers like the shift and firmness of the auto part. They mention that it shifts very positively, has a precise shift, and shifts instantly in next gear. That said, opinions are mixed on ease of installation.

AI-generated from the text of customer reviews

5 customers mention5 positive0 negative

Customers are satisfied with the shift of the auto part. They mention that it shifts very positively, is smooth, and precise. They also appreciate the instant shifts and the noticeable improvement in shift quality.

"...Not banging, tire chirping shifts, but firm, push in the back shifts. No lag between shifts, just shifts instantly in next gear." Read more

"...Converter lockup now is unreal. No flair during shifts.Shifts are firm and noticeable from 1-2 but the rest are quick with no flair or lag...." Read more

"...The shift improvement was noticeable to me, but definitely not harsh. My wife did not seem to notice or at least did not complain...." Read more

"...Order the oring seal and its simple.Trans now shifts perfect. Not race car hard but more like its in Tow Haul mode." Read more

4 customers mention4 positive0 negative

Customers are satisfied with the firmness of the auto part. They mention that it has a nice firm 2nd shift and more holding power. Some say that the 4th is holding better also.

"...Very, very nice shift feel. Not banging, tire chirping shifts, but firm, push in the back shifts...." Read more

"Great upgrade for any 4l60e transmission. Nice firm 2nd shift and more holding power. Sonnax FTW" Read more

"very smooth but firm and precise shift i had a 2-3 flare before i installed this now its perfect..." Read more

"firm shift, chirps the back tires" Read more

3 customers mention2 positive1 negative

Customers are mixed about the ease of installation. Some mention it's a simple install, while others say it'll be difficult to install with the trans in the vehicle.

"Bought this with the Sonnax 4th Gear Super Servo. Install not too bad with proper tools and if you install it in proper order!!!!..." Read more

"...In vehicle installation for this and the 4th super servo was not easy...." Read more

"...Granted I have 20 years in the business but it was a simple install...." Read more

Top reviews from the United States

FaSSBlac
5.0 out of 5 stars Sonnax 2nd Gear Super Hold Servo
Reviewed in the United States on October 15, 2016
Verified Purchase
Bought this with the Sonnax 4th Gear Super Servo. Install not too bad with proper tools and if you install it in proper order!!!! Follow the instructions, no matter how many transmissions you've done. Once I reinstalled 2nd gear piston in the correct direction, everything went in easily. BUY A OEM SERVO COMPRESSION TOOL. It will make your life MUCH easier. Hardest part was lowering trans enough to get servos in and out. Most time consuming is filing the apply pin. Use a digital caliper, and use a Dremel with the cupped grinding stone. Grind, measure, grind, measure. Had a 2-3
flare after I had to replace Super Dupper, made in China wide band. Put a Borg Warner in and had a 2-3 heavy part throttle flare, 100-200 rpm. Also remove first Sonnax 4th Super Servo, because I thought it might have broke band, which was NOT the case. Installed this with new Sonnax 4th, and I am soooooo very happy!!!! 2-3 flare is gone, trans shifts very positively, 4th is holding better also. Makes the car feel like it is getting more power to the ground because of the positive shifts. These two servos should have come from the factory!!! Very, very nice shift feel. Not banging, tire chirping shifts, but firm, push in the back shifts. No lag between shifts, just shifts instantly in next gear.
8 people found this helpful
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josh hampton
5.0 out of 5 stars Do not put seals in until proper clearance is achieved.
Reviewed in the United States on August 5, 2020
Verified Purchase
Used during 4l60e rebuild along with complete Sonnax Servo performance pack and HD 2-3 valve. It may seem pricey but it seems to have hell of a lot of holding power. Converter lockup now is unreal. No flair during shifts.
Shifts are firm and noticeable from 1-2 but the rest are quick with no flair or lag. I’m very pleased with complete package.
Items were Installed on 1/2 ton 4x4 suburban.
One person found this helpful
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LBT
5.0 out of 5 stars Nice improvement. Difficult install with trans in vehicle.
Reviewed in the United States on March 3, 2018
Verified Purchase
I ordered this kit with the Sonnax super hold 4th servo and the Sonnax boost valve kit. This was installed in a Caprice wagon with about 80k miles on the transmission. I installed them all at the same time, so I don't know how much of the improvement came from each of these parts. The shift improvement was noticeable to me, but definitely not harsh. My wife did not seem to notice or at least did not complain. So if you're looking for neck snapping shifts from your 4L60, you will need to do more than just these 3 parts.
In vehicle installation for this and the 4th super servo was not easy. I had to remove the trans crossmember and lower the transmission as far as it would go. I also pulled the passenger side cat. Clearance was still very tight and this was not an easy install. Installation in a transmission removed from the vehicle would have been pretty simple.
One person found this helpful
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Amazon Customer
5.0 out of 5 stars Sonnax is too notch.
Reviewed in the United States on December 20, 2019
Verified Purchase
Great upgrade for any 4l60e transmission. Nice firm 2nd shift and more holding power. Sonnax FTW
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J. Betz
5.0 out of 5 stars Great easy upgrade
Reviewed in the United States on March 1, 2016
Verified Purchase
My older Avalanche runs great but the 1-2 shift was a little slow and soft. I installed this kit in about 30 minutes on my back at home. Granted I have 20 years in the business but it was a simple install. For the novice it could use a set of directions but without them just install the seals in the logical places and swap springs. One note is that the kit doesnt come with the servo cover seal. It is much easier to cut and pull out the seal to remove the cover but without it you cant do that. Order the oring seal and its simple.

Trans now shifts perfect. Not race car hard but more like its in Tow Haul mode.
4 people found this helpful
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DARRIN J.
3.0 out of 5 stars there is grinding involved fyi
Reviewed in the United States on May 4, 2023
Verified Purchase
I understand for best performance adjustments may need to be made, however I did expect a part for a GM transmission would be a direct fit as well, there are like 4 billion of these transmissions out there.
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michael johnson
5.0 out of 5 stars ... a 2-3 flare before i installed this now its perfect had to drop trans down a little to get ...
Reviewed in the United States on August 5, 2015
Verified Purchase
very smooth but firm and precise shift i had a 2-3 flare before i installed this now its perfect
had to drop trans down a little to get new longer pin in
4 people found this helpful
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Alvis Franklin
5.0 out of 5 stars Five Stars
Reviewed in the United States on February 8, 2018
Verified Purchase
firm shift, chirps the back tires
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