Categories

Oct
05

Which servo should I choose?

FAQ: Do I need the standard corvette servo or the servo with the longer pin? And what about the 4th gear billet servo?

If you have a 700R4, 4L60E, 4L65E, or 4L70E automatic transmission, and want to upgrade your servo, you have several different options available to you:

  1. Corvette servo
  2. Corvette servo with longer pin
  3. Billet 4th gear servo

First, you can install just the standard corvette servo found here

With this servo, right away you’ll notice faster and firmer 1-2 shifts and even slightly better 2-3 shifts. Also, this servo will give your transmission 50% more apply pressure, just what you need to keep from burning your transmission up under heavy load situations.

The corvette servo is a great upgrade for not a lot of money, and you do not need to take the transmission out to install it. Our servo comes with two rigid seals and two rubber seals, as well as 3 pages of instructions for easy and detailed installation.

Second, you can install the standard corvette servo with the longer pin found here

With this package, you get the corvette servo outlined above and you get the longer pin all in one package. The included longer-than-stock servo pin does a great job of getting your band adjusted to the right clearance. It’s almost more important to get the right clearance than it is to change to the corvette servo.

Not sure if you need the longer pin? You can test your clearance by pushing in on your servo cover. If you notice that it moves in between 1/8″-1/4″, you know you need the longer pin. This is way too much travel, as the clearance should be closer to 1/16″.

Also, since the servo isn’t traveling as far before it applies the band, the 1-2 and even the 3-4 shift will be much quicker.

Finally, you can install the standard corvette servo, and purchase the 4th gear billet servo found here

With these two products, you’ll get all the benefit of the corvette servo, as well as better holding capacity in 4th gear. Plus, if you go this route, you won’t need to buy the servo with the longer pin.  The reason is because this 4th gear billet servo is manufactured with tighter tolerances, which tightens up the clearance issue that the longer pin typically tackles. 

If money allows, Oregon Performance Transmission recommends purchasing the standard corvette servo, as well as the 4th gear billet servo. 

If you have any questions about servos, or which combination might be right for your vehicle, please do not hesitate to contact us at sales@oregonperformancetransmission.com for more information.

 

 

Feb
29

The Corvette Servo

 

 

Corvette Servo (part number NTP-K51828C)

TRG-7-2p

Arguably one of the most inexpensive, yet most rewarding upgrades to your 700R4 or 4L60E (4L65E, 4L70E) transmission is the corvette servo. Right away you will notice faster and firmer 1-2 and 2-3 shifts. The corvette servo will give your transmission 50% more apply pressure, which is just what you need to keep from burning your transmission up under heavy load situations. The corvette servo is a must for any performance vehicle, for towing, RV, or off road use, and is a positive upgrade for any 700R4 or 4L60E transmission. Our servo is easy to install and can be done with the transmission in the vehicle. The servo comes with all of the necessary seals for installation; including the outer cover o-ring, as well as three pages of instructions with diagrams.If you have already decided to install a corvette servo, your next question might be whether or not you should use the corvette servo with the longer pin instead. Here’s how to decide.

Corvette Servo with Longer Pin (part number OPT-CV-Pin)NTP-CorvetteWP

After a short amount of time, by 30,000 miles or so, the band has been broken in and the servo travel has increased a lot.  Too much servo travel can cause a delay in shifting, a longer 1-2 and 3-4 shift, as well as a slide-and-bump-into-gear type shift.  By 100,000 or more miles, the band is wearing out and then you are at the point where the servo almost cannot travel far enough. Once it is beyond the travel of the servo, it will burn up the transmission.  The longer pin is designed to take up that slack and prevent the servo travel.    You can actually test your current travel now.  Just get underneath it and with a pry bar, push in on the cover of your servo.  If it goes in more than 1/8″, you definitely want the longer pin.  The clearance should be closer to around 1/16″.Please note:  If you are installing, or already have installed, a shift kit, you will likely not need a longer servo pin.  Most shift kits are designed to address the servo travel issue already.Another option to consider is the 4th gear Billet Super Servo.

Billet Super Servo 4th Gear Apply Piston & Cover (part number SUP-K034)SUP-K034

The 4th gear billet super servo is a tremendous product that addresses the 3-4 shift.  You will find better holding capacity in 4th gear, as well as an overall firmer 3-4 shift. The servo has an excellent design that includes a lip seal on piston that allows for much less leakage, as well as a  proper 4-3 (no drag) release. To top it off, this servo is constructed of billet aluminum and is built to last. The 4th gear super servo in conjunction with the corvette servo will solidify your transmission shifts from start to finish while giving overall life to the transmission and vehicle.In some cases, we have noticed during installation that the 4th gear servo does address some of the clearance problems as well as decreasing some of the servo travel;  basically eliminating the need for the longer servo pin.

As always, if you have any other questions or need any product recommendations, please feel free to contact us at salesdesk@optsales.com.

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