Blind Driver

I'm looking to simply firm up my 1-2 shifts. It's lags way too much. I don't need to bark the tires, but firmer shifting is needed. WOT shifting seems to take forever. Part-throttle is crisp.

I'm guessing the Corvette servo would be my first/best option?
I've seen the servo on Summit as well as several transmission parts sites for under $25 including all the seals.

Berlinetta00

Try the trans go shift kit for the 700r4 (beating a dead horse). Works great, comes with the corvette servo, and does so much more. A better $60 on your transmission could not be spent, considering that you would have to break it down almost as much for just the servo.

Blind Driver

I've already removed the pan and replaced the filter and gasket
Probably still be worth dropping the pan again.

TZFBird

Did you already check the TV cable adjustment? That makes a difference as far as shift quality/feel. I've burned up a freshly rebuilt trans on first WOT pull because I didn't know how to propperly adjust it.

Blind Driver

I need to move it a notch I think. Shifting crisp at moderate throttle. Takes about a second for it to shift 1-2 at WOT. Really mushy feeling.

Berlinetta00

The TV cable adjustment is key with the 700r4, haynes manual has a perfect explanation of the adjustment, something to the effect of the throttle should open all the way and pull linerally against the cable while doing so. With aftermarket carbs, the geometry changes and the cable is not always pulled the right amount for the throttle position, so it is something to play with if you have an aftermarket carb.

I would say that if it is feeling mushy, and you install the transgo kit, one of two things will happen: your tans will shift firmer and faster after the kit is installed, which indicates the poor shifting was a valve body misfunction, or your shifts will cease or become erradic, which indicates a problem with the band clutches on the planetary gear sets. If the latter is the case, it is time for a new or rebuilt transmission. Hope this helps,

Gumby

Oh yes you do, cause gigglin like a school girl when it happens does so much for the inner soul. Its a must.

Tobias05

http://www.transmissioncenter.net/hi...odCg91JQ#Parts

...how about 35% more grunt than the famed corvette servo?

articwhiteZ

iTrader: (56)

nothing like.. driving like Grandma and you get a barrrk at the start
and 2 more has it Hits 2nd and 3rd (Drive) even at 20mph

gives you the warm fuzzys

Pro Built Automatics

The Corvette servo will firm up 2nd and 3rd gear shifts, it will not change shift timing. This is a good improvement. You do not need anything bigger, such as the aftermarket billet servo. They have there place, but not here. If the shifts are occuring late, this will not address that.

chazman

iTrader: (4)

What would be some reasons that 2nd and 3rd would shift early at full throttle?

Pro Built Automatics

If the TV cable is adjusted correctly, tight at WOT, then the governor might be at fault. It depends on what year we are talking about. Early 1982 - Early 1987 units have this problem, but it is mostly from the shift timing valves causing the problem. The TV cable is the problem most of the time, not being adjusted correctly.

Booty_Con

I'm curious about this--has anyone tried this billet servo at all? Any feedback to share? I now have a corvette servo in mine but the shifts don't feel that much more firm than stock. (It was professionally installed by a transmission shop.)

articwhiteZ

iTrader: (56)

IF I REMEMBER right..

had mine done with a shift Kit. that came with My 9" convrt (now none lock up)... with the Kit and the Vet parts.. You can feel the Diff. ea and every time the tranny shifts.. the tires cherp. even at just 20 mph,
mine is also Just a 4 speed auto now.. if i leav it in 4th(over drive)
and drive on the street.. it will shift 1...2...3...4.. with out touching anything.. Sweet!! the Kit came with the B$M convrtr.
i dont use 4th for anything.. unless im making a short road trip.
always Fun..

FireInMe17

I'm also interested in a better servo, what are some good mods to make our 700's shift firmer, cripser, faster, and with less well,.... vrooooooooooom, thud, vroooooooooooooom? lol

When I get my car up to about 115+ and try to push the throttle a bit harder it wants to break loose the grip the torque converter had on it when it was locked up and go straight to 4th, and I know it will go faster if I can get it to ride O/D with out breaking free of it. I want to actually make it shut off once on the highway lol, the fastest I had it was to about where it says MPH on the 90-92 dash with the 110 speedo. Anything more than that and it breaks O/D.

Drew

iTrader: (58)

In stock form the 700R4 will downshift to third at cruising speed with more then about 1/2 throttle. That's normal unless you replace a valve in the transmission.

However, 3.1L and 305TBI cars are programmed to kill the engine at 115mph, so it'd be kind of pointless anyway.

FireInMe17

The tach has to be wayyyyy off then after it goes past 110, because it feels like I'm still slowly accelerating and the speedo just keeps climbing, its never killed the engine.....yet

Plus when I'm doing it the cars def more than 1/2 throttle before it breaks.(And by break I mean O/D into 4th....lol)

On the mounting bracket for the throttle cable and TV cable and that on the throttle body, there is a second hook for the throttle cable that is not set by the factory defaults, well I switched mine over to that because it makes the throttle cable tighter and theres no delay from when you step on the pedal to when the trottle actually opens, so you don't have to press for a bit before it starts to work.

Could that have anything to do with it?

Drew

iTrader: (58)

You mean you hooked the throttle cable up to the post for the cruise control cable? Yeah, that's probably not a good idea.

FireInMe17

And why not? It serves the same purpose.

Drew

iTrader: (58)

Geometry and engineering. Obviously GM engineers put a stud on the throttle body lever where they determined it would work best. Also the cable bracket lines the cables up with the intended studs. Using the wrong cable on the wrong stud is probably going to strain the cables assuming they don't bind. It's not like you're going to cheat more power out of the car by trying to out smart GM's design. It might not hurt anything, but then what is it really helping?

But like they say, ignorance is bliss.

FireInMe17

The only reason that I decided to do it was one day I noticed that that hook was a bit further out than the one that the cable was on to begin with, and I wanted to tighten up my gas pedal, and it gave me what I wanted, and doesnt really change the position on the cable all that much at all to be honest, and well a tighter gas pedal in my mind makes the car feel a bit sportier and it just feels nicer.


It doesn't make anymore power, it just makes it feel like its making more power


I've been using it like this since June and I've had no problems with it, and I think the cables should be just fine.

I guess ignorance is bliss