Dragonsys

I have the below Super Servos and was wondering what else I should put in with them, on a stock 4L60-E, or if I should wait until I build the transmission up more.

Superior Super Servo (K012) - http://www.superior-transmission.com...age.cfm?ID=121
Superior 4th Apply Piston & Cover (K034) - http://www.superior-transmission.com...Page.cfm?ID=73

I had a .500 Boost Valve for my 3rd gen (never installed along with these servos), but I cannot find a .500 one for the 4th gen, closest I found was .490 at Sonnax.

I have done some searching, but most of the talk was about the Corvette Servo, which I already have as a stock part ('02 T/A), from my understanding.

bbond105

The .490 Sonnax with o-rings is better than the TransGo .500.

mrvedit

Mr Bond is referring to the highly recommended .490 Sonnax Boost valve. For a '02 4L60E you need part # 4l60e-LB1.

Dragonsys

Yeah, that is the one I found. I have a Sonnax .500 for a 3rd gen, too bad it won't work in the 4th gen

clinebarger

.490" boost valve is all you will ever need in a 4L60E.

Installing a 2nd servo with anymore apply area than a "093" Vette servo on a stock unit WILL break ****......Whether it be the Reaction Sun Shell, Or the 2-4 Band.

Normally the Anchor Pin hole in the band will start to elongate & eventually fail, Alto reinforced this on their bands with thicker steel.

The Reaction Sun Shell will either break at the splines & strip them out. Sonnax Smart Shell will fix that.


As a side note, I have seen quite a few Alto bands with the Apply bracket ripped clean off the band when running Superior/Fairbanks 2nd servos.

Wide Alto Carbon Band.

coryforsenate

iTrader: (1)

clinebarger, what's your opinion on the Sonnax servos, 2nd and 4th? If I recall, they have an apply area in between stock/corvette and the Superior/Fairbanks servos.

Dragonsys

So, you recommend the stock servo (I have been told, and seen on here that LS1 cars come with the Vette Servo stock), .490 Boost Valve and the Sonnax SmartShell?

What about the 4th Apply Servo Piston?

bbond105

Unless you are planning on doing a lot of towing, the stock 4 apply servo is all that is needed.

Dragonsys

cool, thanks

North*power

iTrader: (1)

A little offsubject but, has anyone had slipping in overdrive with the Billet Sonnax servos? Mine will slip in OD, throw a SES light and then shift extremely hard therein after.

mrvedit

This is likely because you band is worn and your servo now has excessive end play. Based on posts here, with a stock servo a worn band typically first causes slippage in 2nd gear; with billet servos a worn band typically first causes slippage in 4th gear.

This recent thread might help; also notice the links to other threads in my post #3 there:

https://ls1tech.com/forums/automatic...ird-forth.html

In this case the OP lost 2nd gear, but other times (especially with billet servos) it is 4th gear.

Try to measure your end play, as I describe there, and post your results here.

clinebarger

The Sonnax 2nd servo is still overkill for most applications, At least it retains the Cushion Springs. I would still highly recommend a good aftermarket Band & don't go crazy on the 2nd feed hole on the plate.

I am running a Sonnax 4th servo in my Camaro, I like it a lot! Even with a active 4th accumulator the 3-4 shift is real nice & noticeable.

To my knowledge all V8 4th gen F-bodies 4L60E's had Vette servos from the factory. At least every one I have built does.

If it were me & the trans shifts good now.....I would leave it alone & save up some money to have it built.

You have to check Band clearance, Spec is .075"-.125".

If you removed the stock washer on the apply pin & replaced it with the Gold Sonnax washer.......This is Incorrect! Leave the stock washer in place, Place the Sonnax washer over the end of the apply pin/E-clip.

The purpose of the Sonnax washer is to emulate the raised **** on the factory 4th piston.

Here is a pic that may help with explaining this, Notice the raised area on the stock 4th piston on the left vs the Sonnax 4th servo in the picture.

Dragonsys

Sounds good. 2nd gear is starting to go, so I will probably have to rebuild/replace within the year or so. I was hoping the 2nd Servo might help, but doesn't seem like it would help in the right way, lol

mrvedit

Sometimes lengthening the servo pin with a blob of weld will get you another 5000 miles or so out of the trans. Follow the links in my post #11 which will take you to links of people that successfully tried that approach. Sure it a bandaid, but give you some extra time.

thunderstruck507

iTrader: (18)

Really thinking of getting an upgrade servo for mine as I'm getting an occassional 2-3 shift flare even with the Sonnax HD2-3 shift valve. It seems likely the cause is my junk Lokar braided tranmission dipstick does not show the correct level for hot full (assuming fluid level should be near the pan/trans mating service full and running like I've been led to believe.

I have a beast sunshell, wide carbon band, and HD2 kit in the trans already.

Is this still a bad idea? I'm told the servo will still help on a 2-3 shift.

mrvedit

Do you have a deep trans pan that holds an extra quart?
I would start there.

thunderstruck507

iTrader: (18)

Yes, using a deep pan and matching filter.

The transmission is only 2 years old. I would not think that equates to more than about 30k miles. It only seems to have problems after it performs a 3-2 downshift, when it comes time to upshift back to 3 it wants to slip before engaging.