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4L60E Corvette Servo Install; Walkthrough with pictures and details!!
58 Attachment(s)
I recently installed a Corvette Servo in my transmission, and thought I'd take the time to make a walkthrough, since I know how it can be nerve-wracking digging into your trans. Before you begin, I just want to reassure you, its not very hard to do!! It took me about an hour, and thats with taking my time to clean my hands so I could take pictures.
Now, your probably thinking "what the hell would I need this for?!" Well, basically, all this does is gives you a firmer 1st-2nd, 2nd-3rd gear shift, and gives you 50% better holding power in second gear. It uses a bigger piston to apply against the band, which in turn holds the drum alot better. Its not going to chirp the tires every gear like a shift kit would, but it will give you an improvement in shift quality, which is good for towing and such. For starters, your gonna need your corvette servo, I got mine off of ebay from a company called CT Powertrain, it costed a whopping $14 bucks. https://blazerforum.com/forum/attach...ine=1391480097 http://www.ebay.com/itm/700-700R4-4L...e1e231&vxp=mtr For tools, all you need is some picks, a couple flathead screwdrivers, channel locks, a big c-clamp, some brake clean, and a quart of FRESH trans fluid. BE SURE TO CLEAN ALL PARTS WITH BREAK CLEAN AND A LINT FREE TOWEL!!! The valvebody in the trans has very tight tolerances, and even a small piece of lint can screw up its operation, so everything has to be PERFECTLY CLEAN!! I used paper towels to wipe everything down, and I suggest you do the same!! First, jack up the passenger side of the vehicle, get under, and this is what your looking for. https://blazerforum.com/forum/attach...ine=1391480097 Now get your big screwdriver, and pry that cover in. I went against the torsion bar on my blazer, and that worked great! Now look closely, see the notch? Theres a big c clip you need to pull. I got that out with a smaller flathead. Now you can pull the cover off! Chances are, its not just gonna pop out, so use your channel locks on that little circle part, and rotate it back and forth until it walks out. https://blazerforum.com/forum/attach...ine=1391480097 After you get that off, this is what your gonna be looking at. This is the 4th gear apply piston. https://blazerforum.com/forum/attach...ine=1391480097 Now pull it out! It just slides right off https://blazerforum.com/forum/attach...ine=1391480097 What your looking at now https://blazerforum.com/forum/attach...ine=1391480097 Out of the trans! https://blazerforum.com/forum/attach...ine=1391480097 Now pull the rest of the servo https://blazerforum.com/forum/attach...ine=1391480097 Then this spring. Don't loose this!! https://blazerforum.com/forum/attach...ine=1391480097 Now that you have the assembly out, its time to swap some parts. First pull this e-clip, careful because it has a tendency to fly across the garage and go missing. Save yourself the headache and cover it with your hand while you pull it. This is where your 90 degree pick tool comes in handy!! https://blazerforum.com/forum/attach...ine=1391480097 Now you should have these parts lying out on your workbench https://blazerforum.com/forum/attach...ine=1391480097 Next, pull the piston rod out. This is what physically touches the band https://blazerforum.com/forum/attach...ine=1391480097 Compress the spring with your c-clamp https://blazerforum.com/forum/attach...ine=1391480097 Pull the snap ring https://blazerforum.com/forum/attach...ine=1391480097 Now pull this cover off, and the big spring. You'll be transfering these to the new servo https://blazerforum.com/forum/attach...ine=1391480097 https://blazerforum.com/forum/attach...ine=1391480097 Comparing old parts (left) to new (right) https://blazerforum.com/forum/attach...ine=1391480097 The new servo, install your new teflon rings into the grooves https://blazerforum.com/forum/attach...ine=1391480097 https://blazerforum.com/forum/attach...ine=1391480097 https://blazerforum.com/forum/attach...ine=1391480097 Slide the piston back in https://blazerforum.com/forum/attach...ine=1391480097 Install the spring https://blazerforum.com/forum/attach...ine=1391480097 Washer https://blazerforum.com/forum/attach...ine=1391480097 And finally the e-clip https://blazerforum.com/forum/attach...ine=1391480097 Now for re-installation! First install the spring... https://blazerforum.com/forum/attach...ine=1391480097 Then the second gear servo assembly https://blazerforum.com/forum/attach...ine=1391480097 Then this thing (don't know the name of it) MAKE SURE the notches on it point OUTWARDS!! https://blazerforum.com/forum/attach...ine=1391480097 Then the 4th gear apply piston. Make sure you install it the right way, or you'll have to pop the cover off and turn it around to get overdrive back https://blazerforum.com/forum/attach...ine=1391480097 Then the servo cover!! Be sure to throw your new o-ring on, and lube everything with trans fluid! https://blazerforum.com/forum/attach...ine=1391480097 Now, all you have to do is pop the servo cover on, throw on the snap ring then take it for a test drive. If it doesn't leak on the first startup, then you should be fine! Now take it for a test drive and enjoy your nice crisp shifts!! |
Good walk thru! If you had to do it again would you go straight to the corvette or sonething in between, a little less aggressive? Also do you know how to fool the electronic pressure regulator with a resistor?
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Very interesting, nice write up!
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Originally Posted by LeWhite
(Post 617434)
Good walk thru! If you had to do it again would you go straight to the corvette or sonething in between, a little less aggressive? Also do you know how to fool the electronic pressure regulator with a resistor?
Originally Posted by Captain Hook
(Post 617437)
Very interesting, nice write up!
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The thread is kind of old but I think it is THE $4.00 TRANS MOD or something like that. It also speaks about too much pressure. My trans parts man suggested that the vette servo is too much and the stock one is too cush. I think he said there were 4 stock sizes
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I read last week that you were waiting on your vette servo... thanks so much for posting this walk through, if I don't use it this weekend... well, that means I found out it's not my servo- but I'm sure it will come in handy for someone!
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Did this on my servo, not to aggressive at all. Tighter shift, less slippage, less wear. Worth 14.00 and an hours work
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Originally Posted by LeWhite
(Post 617476)
The thread is kind of old but I think it is THE $4.00 TRANS MOD or something like that. It also speaks about too much pressure. My trans parts man suggested that the vette servo is too much and the stock one is too cush. I think he said there were 4 stock sizes
Originally Posted by moblakely
(Post 617483)
I read last week that you were waiting on your vette servo... thanks so much for posting this walk through, if I don't use it this weekend... well, that means I found out it's not my servo- but I'm sure it will come in handy for someone!
Originally Posted by newguy
(Post 617495)
Did this on my servo, not to aggressive at all. Tighter shift, less slippage, less wear. Worth 14.00 and an hours work
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This is looking like an easy project. It affects 1-2 shift only or all shifts?
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I believe it effects all but I notice it most on 1-2
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