Vetto Servos

[Chevy_Mudder6]

What do they do?

ARe they like a shift kit or do that just make the tranny hold a gear longer, I need someone to explain??

O, this for a 95 4L60E.

[clubber]

They shift faster than stock servo's. Lind of like a shift kit. They do not change the shift points. I had vette servo's put in the trans at the last service and overall I like them. I believe that the idea is the faster the shift, the less heat added to the trans from clutch slippage
Stan
'98 K1500

[Chevy_Mudder6]

SO which is better, a shift kit or vett servos?

I'm havin my tranny rebuilt so I was just thinkin ahead??

[97Silverado]

SO which is better, a shift kit or vett servos?

I'm havin my tranny rebuilt so I was just thinkin ahead??

You can use both...I did. If you were gonna get just one I say the shift kit.

[Chevy_Mudder6]

Ok, so the vett servos make a faster shift and the shift kit makes a firmer shift which in turn is faster.

So how much are the vett servos?

I know a shift kit from transgo is like 130 bucks.

So with a good ship and vett servos, you could have the vett servos for a faster shift and then the chip to rasie the shift points and add some pressure to make firmer, right?

Ok now that I think about a chip.I once heard that a chip will not make the shifts any firmer at wot, is that true?

[2nd Time Round]

What about the jumbo servo from TCI? http://www.tciauto.com/new_products.htm (almost at the bottom of the page). I also noticed that they had some planetary gears and a sun shell too. Are the TCI parts worth it?

[bignick81]

you can also get a billet servo and a billet Overdrive servo, corvette servo only does 1st and 2nd gear. i got one and a shift kit. i like it, it kicks

[traviz71]

do both. i did the transgo kit, vette servo, and billet od servo and really like the setup. i recommend transmissionpartsusa.com for your parts as they have pretty decent prices. i got the vette servo for around $10 (the billet 1-2 servo is not worth the price when the vette servo is almost as good an upgrade and much cheaper since they are so numerous) and the transgo kit was half the price of summit--warning if you plan to do the install yourself, the hd2 kit does not come with the video but otherwise is the same kit. i was unware of this when i ordered but completed the install with minimal complications. the problems i had were simple mistakes that i probably would have had even with the video since it was my first transmission work. the instructructions are the same and pretty straight forward. just allow plenty of time.

i got the billet OD servo from summit but is really not that necessary if you dont plan on towing much. i did mine to help stregthen things for the lift and to keep things tip top if i do end up towing more in the future. i also recommend a trans cooler (havent gotten mine installed yet but its sitting in the garage) and a boost valve.

[96ImpSS]

The Transgo shift kit has provisions/instructions for dealing with the 093 (Corvette) servo, or the standard one. My recommendation is to get both the kit and the servo. The servo is only about $25 including the better seals, from www.pro-built.net . Without the 093 servo, it's doubtful that you'll get a good quality (firm but not harsh) 2-3 shift. 1-2 shift is never a problem to get right, although with the 093 servo, you'll probably want to back off by 1 washer in the accummulator. Do not get the "billet" 1-2 servo; it's overkill and harder on other trans parts. To understand the parts relationships much better than this, you ought to call and talk to Dana at Pro-Built. He's one of the few trans builders in the country who has been able to build 4L60E's to stay together behind 500+ hp LT1 engines, so I take his advice seriously.

Pat Gish

[Chevy_Mudder6]

What is this boost valve??

SO I need the vett servo for 1-2 and then shift kit for 3-4.Ok now I understand.

[traviz71]

What is this boost valve??

SO I need the vett servo for 1-2 and then shift kit for 3-4.Ok now I understand.

boost valve allows more fluid to flow and build more pressure. i used a .500" for mine.

the shift kit provides firmer shifts for each shift. like was said above, the servos allow for a faster shift and therefore building less heat. the combination is the most beneficial upgrade

[Chevy_Mudder6]

Ok thanks.

[chevy_ss_383]

What is this boost valve??

SO I need the vett servo for 1-2 and then shift kit for 3-4.Ok now I understand.

the .500 tv boost valve will increase line pressure in all gears. a .290 low/rev boost valve will give a lot more pressure in reverse and manual 1st. tciauto.com now has a .570 boost valve and .400 low/rev valve. theyre about $35 each. so its not really worth it unless you want insane shifts for the hell of it or have a lot of torque.
the vette servo will take care 1-2 shifts. but a shift kit will address far more than just 3-4.

[mntahoe]

Just curious, but I was just looking at the transmission tables on TunerCat and it looks like all this stuff (shift times, pressures, etc.) is adjustable from the PCM on the 4l60e. How would changing the shift times with a vette servo be different than just telling the PCM to shift quicker?

[96ImpSS]

Just curious, but I was just looking at the transmission tables on TunerCat and it looks like all this stuff (shift times, pressures, etc.) is adjustable from the PCM on the 4l60e. How would changing the shift times with a vette servo be different than just telling the PCM to shift quicker?

The only 2 things that PCM editing can do is adjust line pressure and the beginning of the sequence of events that make up a shift (The shift actually occurs several hundred rpm later than PCM command).
A line pressure increase WILL firm up the shifts, but there are mechanical/hydraulic limits imposed by the way the factory sets up the valve body. To adjust the timing of the events comprising a shift in order to make the shift quicker and smoother, not just firmer, you have to modify the hydraulics. "Exhaust" flow to release one gear and "apply" flow to engage the next are affected by the servos and valve body calibrations and capacities.

[mntahoe]

Makes sense, thanks.

[jonnybravo]

I went to transmissionpartsusa.com and will be getting some parts when I change my fluid.
35952 TH700-R4, 4L60E Corvette Style 2-4 Servo Piston with O-Rings 1982-on

35935 4L60E SHIFT KIT® 1993-2003

what is this part for 35935-HD2 4L60E Perfomance REPROGRAMMING KIT™ 1993-04. (.500 Boost Valve included).
Maybe I should just call them...

Is this what I want??

[mds2004]

Yes both of those are good. You should also get the check valve and the sep plate.

This as my order from transmissionpartsusa:

Items Ordered: Price: Status:
1 of : 19260 Dr.TRANNY™ Assemblee GOO (Blue) 16oz.
$3.20 Shipped
1 of : 35098B 4L60E Valve Body Seperator Plate 1996-04.
$13.91 Shipped
1 of : 35935-HD2 4L60E Perfomance REPROGRAMMING KIT™ 1993-04.
$78.30 Shipped
1 of : 35952 TH700-R4, 4L60E Corvette Style 2-4 Servo Piston 1982-on.
$9.41 Shipped
1 of : 77701-076 700R4, 4L60E Servo Release Check Valve.
$9.74 Shipped

After those I went to GM to buy the accumulators. Part number is 24204496 and it comes with both. It costs about $25.

I learned all of this from Hitman X and I have yet to have it installed. It will be finished monday along with new and improved internals too with other doodads.