How To Install Corvette Shift Servo

buckshot85

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I know this has been posted with the link but I feel it deserves a sticky on the How To section. It's a Great How to for GM guys. Installing mine this weekend :tmc:.


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Originally posted on GMFS by fatkidkustomz :http://www.gmfullsize.com/forum/showthread.php?t=98029&highlight=servo

Thanks, Fat Kid!

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First off, let's answer some of the questions always asked...

Q: What benefit does a Corvette Servo give you?
A: You'll get firmer, faster shifting, and about 50% more holding power in second gear, which is where the 700R4 or 4L60E transmission really lacks in quality.

Q: How much money are we looking at?
A: I bought mine on eBay, from Oregon Perfomance Transmission. $32.50 shipped to my door in 3 days. These guys are fast, and have great customer service.

Q: Can I do it myself?
A: Can you work a screwdriver and a C-Clamp? If so, then yes. If you can change your oil or brakes, you can do this.

Q: What tools will I need?
A: A few flathead screwdrivers (small and medium), a prybar, a drip pan, C-clamp, 10mm socket and ratchet, and a few rags.

Ok, enough Q&A... let's get this thing done.



When you get your servo, you should have this:
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ServoInstall001.jpg

The actual servo itself, a plastic split o-ring, a blue rubber o-ring, and a new pin.

Now, the servo is located on the passenger side of the transmission, and may (or may not) have a heat sheild blocking access to it. Mine did, but you should know what a heat sheild is, so I didn't take a picture (ok, I forgot).

After you get the heat shield off, you should see this:
wol_error.gif
Click this bar to view the full image.
ServoInstall004.jpg


Here's where the prybar comes in. See where it's sticking out? Put your prybar there, and push it in. It may take a good bit of force. Then, there should be a notch in the transmission casing, where you can get a medium flathead screwdriver in. Slide it in, under the snap ring, and pop the snap ring out.

Get your drip pan ready, and then grab where you were pushing with the prybar, and pull it out. You may have to use pliers (I did), but it'll come out.

After that, pull the next peice out. It's the 4th gear apply piston. Set it to the side.

Next, we're gonna pull the servo assembly out. Look at the one on the left:
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ServoInstall005.jpg

See where the pin goes through, and there's a small spring, washer, and e-clip? Stick your medium screwdriver up in there, and use the washer to pry the assembly toward you. Be gentle, you'll be re-using some of these parts.

It's probably not going to fit coming out as a whole assembly. What I did, was pull it out most of the way. Then slid the 3rd gear apply piston off of the 2nd gear apply piston. Set that aside, and you should be able to wiggle the rest of it out. Make sure you grab the spring that might still be inside the transmission.

Once you get it out, you should be looking at this:
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ServoInstall012.jpg


We're going to take the e-clip off, carefully. Don't loose it... they have a tendency to fly. Then slide your washer off, and spring, and slide the pin out.

Now grab your C-clamp. Clamp it like this:
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ServoInstall010.jpg


What you're trying to do is compress the spring inside, so you can remove this snap ring:
wol_error.gif
This image has been resized. Click this bar to view the full image. The original image is sized 798x600 and weights 67KB.
ServoInstall011.jpg


Ok... so everything's apart right? Go grab a beer, some clean transmission fluid and take a break.

Now, to put it back together, make sure you have all this:
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ServoInstall008.jpg


Note:Lube everything with a light coat of trans fluid as you're putting it back together. Dry metal on metal contact is never a good thing when you're dealing with moving parts.

Put your big spring back in the new servo assembly, clamp (I used a rag so nothing was gouged), and put your snap ring back on.
wol_error.gif
This image has been resized. Click this bar to view the full image. The original image is sized 798x600 and weights 73KB.
ServoInstall009.jpg

wol_error.gif
This image has been resized. Click this bar to view the full image. The original image is sized 798x600 and weights 65KB.
ServoInstall010.jpg

wol_error.gif
This image has been resized. Click this bar to view the full image. The original image is sized 798x600 and weights 67KB.
ServoInstall011.jpg


Next, put your pin through, and re-install the spring, washer, and e-clip.
wol_error.gif
This image has been resized. Click this bar to view the full image. The original image is sized 798x600 and weights 54KB.
ServoInstall014.jpg

wol_error.gif
This image has been resized. Click this bar to view the full image. The original image is sized 798x600 and weights 56KB.
ServoInstall012.jpg


Make sure you have everything, and head back under the truck.
You should have something that looks like this:
wol_error.gif
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ServoInstall015.jpg



Now comes the fun part. Slide the assembly back in. You'll have to do it the same way you took it out, one peice at a time. It's tricky lining the pin up, so take your time, but once you get it, everything else slides right in.

Now, put your cover back on (that thing with the hump you were prying on at first), making sure not to tear the o-ring.

Almost done... Grab your prybar again, and push the cover in again. Pop your snap ring back into place, and you're ready to go!
 

99sierraman

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I do not regret installing mine! Easiest and best mod I have done to my truck to this day. I actually used this how-to as a walk-through too. :thumbs:
 

buckshot85

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It seems simple enough. For the price I don't mind taking some time out to help out my BB tune. I was told by Justin to do it before a magnacharger anyways. :bbp::applause:
 

daddy

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I added the OP and link to your post. I want to make sure we give credit to the person who performed the write-up! :cheers:
 

buckshot85

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No problem I'm glad he did lol. It will make things a world easier for me
 

Zembonez

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Very cool!
 

Bigredmariner

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Matt take some pictures when you do yours and do a how to under your own name. The reason there is not one already here is because everybody is too lazy to take the time and do a damn how to on the subject. Hell take the pics and email them to me and I'll do the write up if you don't feel like taking the time to help out someone in the future.:tmc:
 

66nova

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It's a great upgrade. Not too hard to install. It can be done alone, but a little help makes it smoother.


Sent from Ft. Worth TX
 

Black05Z71

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Matt take some pictures when you do yours and do a how to under your own name. The reason there is not one already here is because everybody is too lazy to take the time and do a damn how to on the subject. Hell take the pics and email them to me and I'll do the write up if you don't feel like taking the time to help out someone in the future.:tmc:

How about I go buy some beer and the servo then you and the other Houston boys come over and install it for me while I take pictures and drink said beer? :lol::cheers:

I'll even do the write up!:thumbs:
 

Bigredmariner

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I may just take you up on it sometime this summer. It only takes an hour or so to do and really no special tools. With your truck sitting up high we might not even need a jack.

$20 and a quart of trans fluid and that's all you need. I only lost about a cup full of fluid doing mine.
 

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