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4l60-e Upgrades And Maintance

grizzly700fi

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grizzly700fi Enthusiast

grizzly700fi

Posted
Posted

Finished my intake and exhaust mods so moving onto transmission and wrapping it all up with a BB tune. I want to get a 2nd gear servo and 4th gear servo but cant decide which ones. I will be ordering it from Oregon performance so i just need to know what i should get. The corvette servo is only $17 then theirs a superior billet servo for $88 with 18% more apply pressure then the corvette servo and a sonnax 2nd gear super hold for $112 that has 35% more apply pressure then the corvette. I want the firmest shift without damaging the transmission since i just passed 75000mi. The sonnax fourth gear servo is $99 and the superior billet servo is $71 and its is supposed to help the 4-3 shift. Im thinking the corvette servo might not be enough so i would probably get the superior 2nd and 4th gear servos. Just looking for some feedback. A shift kit just changes what rpm you shift at so the BB tune can do the same thing? I'm overdo for fluid changes how hard is it to change the differential, transfer case and transmission fluid and filter?and what part numbers in Canada for fluids and filter?

Thanks

4wd Enthusiast

4wd

Posted
Posted

Not expert but I do a lot of reading,,,they say a good tune is better than the Corvette servo and the other one..These parts were made before the trans become Electronic and continued because it is cheap mode $17 and easy to install. The tune will do exactly what the servo will do plus the other stuff & it's Electronic mode which you can remove in a few minutes...Like you, I want a more reliable trans and read a lot of posts about these mods.

nickvrebel Senior Enthusiast

nickvrebel

Posted
Posted

actually, being electronic doesn't matter. it is different. The servos physically change the apply points/ surface area. You can simulate it with a tune by raising pressures, but it's much healthier to physically do it with hard parts.

 

a shift kit does not change shift points (rpm). that is all electronically controlled by the trucks computer. A shift kit will once again physically change how the fluid moves through the transmission to achieve shift firmness and quickness (how fast the shift takes place).

 

I want the firmest shift without damaging the transmission since i just passed 75000mi.

keep in mind, you are looking at parts that are designed for high horsepower and drag racing applications.

Transmissions set up for these applications are NOT something you would want an 80 yr old grandmother riding in, it can be quite unpleasant. I've driven a 4L60e built by Finish Line Transmissions (back in their prime a few years ago), it was a Level 5, it wasn't for everyone. This trans had all the bells and whistles, we chose to go with a vacuum modulator which greatly helped with pulling tuning out of the equation for certain shift properties - but this was on a 6.0L swap/ cam/ stalled/ headers/ etc. truck.

 

All of these parts have to be chosen and setup correctly to make a comfortable daily driver. Even with that said, comfortable is relative to the person in the vehicle. I can't tell you what is best for YOU. but, I will say that your "intake and exhaust" is a lightly modified vehicle, really you should see improvement with the Corvette Servo and the lower of the upgraded of the 4th gear is all you will ever need and will still be tolerable.

mhenshaw Senior Enthusiast

mhenshaw

Posted
Posted

I would get the 17 dollar corvette servo for sure. If you have the money look into the Billet 4th gear servo too. The corvette servo only affects 1-2 and 2-3. So the 4th gear servo is a nice addition but not necessary. I only did the corvette servo with the BlackBear tune. My take on the servos is they always give you the same kind of shift, but if you only increase line pressure the shifts can be different (sometimes harder than other times). So a servo is worth it to me over just a tune.

 

Also Justin can make your transmission shift however you like so I wouldn't spend a bunch of money on servos.

 

I dropped my pan and changed the filter, then added 5 qts of ATF. You can do a full flush also after the filter change.

DwayneJ Enthusiast

DwayneJ

Posted
Posted

4wd, if the Vette servo is for "pre-electronic" stuff why did my Roadmaster(wagon with woodgrain don't get any more grandma than that) with 4L60E come with one??

 

That should also make a point about how mild the Vette servo is too. They used it stock on all the LT1 cars in the 90s, meaning Fleetwoods, Roadmasters, Caprices. It is a good piece. IMO the whole reason these trucks did not get them is because most people think it is a problem to feel a shift. It is by no means harsh but you can feel the shift.

 

IMO I would call someone like Dana at ProBuilt Automatics and get his opinion and buy the part from him, because the technical support is worth every penny.

He built the tranny for my street/strip Caprice, tranny is over 7 years old, 480+hp for the last 5+ years. Has stock servos, which for that car means a Vette servo.

 

I would also figure out the tranny end BEFORE calling Black Bear as what you do here will affect what he does.

Garrett Street Enthusiast

Garrett Street

Posted
Posted

I have a Corvette servo in my 4L60E and I WOULD NOT want anything firmer than that for day-to-day driving. When I had my tranny rebuilt I had them throw the Corvette servo in there and, in all honesty, I wish I had just gone to stock. Trust me, anything firmer will be unpleasant on a day to day basis. And don't think I'm some old fart, I'm only 20 years old.

grizzly700fi Enthusiast

grizzly700fi

Posted
  • Author
Posted

well im definitely getting the corvette servo then but should i get the sonnax fourth gear servo or the superior billet servo and its supposed to help the 4-3 shift and costs less too. Does the sonnax help the 4-3 shift?

DwayneJ Enthusiast

DwayneJ

Posted
Posted
I have a Corvette servo in my 4L60E and I WOULD NOT want anything firmer than that for day-to-day driving. When I had my tranny rebuilt I had them throw the Corvette servo in there and, in all honesty, I wish I had just gone to stock. Trust me, anything firmer will be unpleasant on a day to day basis. And don't think I'm some old fart, I'm only 20 years old.

 

It was in the tuning or the rest of the rebuild. As I said above grandma's Roadmaster came with the Vette servo. If it was used in the Roadmaster, Fleetwood, Caprice etc. it is not the source of your harsh shifts.

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