Originally posted by Pro Built Automatics:
You can do the modifications yourself by taking out the TV plunger & sleeve. You will want to block the part throttle 4-3 downshift
passages using a small allen set screw in each hole (2). Grind the outside of plug flush, blow off with air make sure plunger moves freely in sleeve, and sleeve goes into the valve body freely. Cost of two allen screws? about .36 cents.
Hope This Helps!!!

[Justin1989]:Sooo.. This thread had some people talking about aftermarket B&M sleeves and GM sleeves..

I was wondering if it's possible to modify your stock sleeve to allow WOT 4th gear. Do I have to buy a new sleeve, or does the original have P.T. holes I can plug?

Remember, I want WOT or really close to WOT 4th gear capabilities in my 1989 GTA.

 

hey long time no see where have you been???????

anyway, i told the guy who rebult my trans that i wanted it to lay rubber shifting, be almost bullet proof and to have WOT in OD

he did it, lol now what he did to allow the OD at WOT i dont know IIRC its in the valve body.....i will try and find out how you can do this yourself, but i dont think it has anything to do the the TV cable

 

You modify the stock sleeve. There is a picture guide that Joby has on his web site. Real easy. try both his name and my name in a TGO search as the post author. One of them will bring up threads on this mode that include the link.

RBob.

 

Man I've been slaving away at school. I take high school AND college so I am in class 12 hours a day + homework.

My car is starting to really fall apart. The headlight motor bearings are shot (on new motors), my dash lights are all out as of yesterday.. I think this might be at the fault of the remote dimmer upon a little bit of research but the weird thing is that my fog lights don't work (new, but worked fine for a few weeks) AND my dash lights don't work. The radio works and displays the clock but will not dim with the dimmer. Also I can still turn on the floor lights, dome light, and rearview mirror lights. I need to fix this VERY QUICKLY as I have to drive this car at night EVERY DAY.

=/

Definately find out what he did. I'm handy as hell with tools so I don't have any problem getting down n' dirty.

EDIT: All the fuses are fine. I even replaced the correct fuses just to be sure.

 

http://www.joby.se/corvette/mods/2002-0X02_tranny_wot/

That's the article. Man this is just what I was looking for. Thanks a bunch, and honestly someone needs to either copy this and put it in the tech articles or post a link to it in the tech articles. I'm sure most people don't know this is possible and would do it if they saw how easy it is!

 

nice. I checked out the pic also and cool stuff.
wot in cali? good luck with that. packed freeways, and cops everywhere. my fav was a wot late nighter with an old friend years ago on the 80 in the same as yours. I thought for sure we were gonna get caught but didn't. went from sac all the way to roseville wot. stupid dumb. I was impressed by the 700r4 in his car because of that feature added. My th350 velle wouldn't have done what the gta did. I know it would've outrun mine and mine was much faster car, I was the passenger that night-again stupid dumb.

 

Just use Allen screws here, and they are self tapping, much less work than is needed in the article. I do this all of the time. Dana

 

Haha Cali isn't as bad as you think. In my area there's a brand new bypass that cops never sit on. Everyone rolls through going 80. Except for me. I've hit 130 so far and that's with 1/2 throttle and cornering.

 

Alright will do. BTW from earlier research I heard they're .160 or .162 self-tap Allens.

 

if your dash lights aint working than more than likely your tail/sidemarkers aint working also........check your fuses, hopefully its just a fuse, if its the switch than its easy to change to.....but i willing to almost put money on a fuse issue

 

Well I got up at 6 and worked on it this morning in the rain laying in the street. Haha. It was the remote dimmer switch. I just had to clean it with WD-40 and it worked again. Only TA's have this.. Tonight I am going to rip apart the tranny with a friend of mine and do the WOT mod. I got some college classes in a quick minute though. Anyone know if the WOT mod requires one to drain the tranny fluid? Or do you just open the sucker up?

 

The fluid will drain when the pan is dropped... About 5 qt's worth.

RBob.

 

Does this mean you can get better top end?

 

its easier, since you can run in 4th at WOT instead of 3/4-1/2 throttle
i love having this mod

 

So I still haven't done it but probably tonight now that I know I need 5 quarts of tranny fluid to refill. I got class from 7-10 tonight so it's gonna be a late night for me haha. Details on that later..

 

well good luck with it tell us how it goes

 

so all you need is a small allen screw and some loctite? Does this hurt anything in the tranny doing this?

 

not a thing hurt. Just makes it easier to hold it wide open in fourth. Maybe just hurt yourself if it is held wot too long.

 

Why the hell didn't gm do this in the first place?

 

i'll do this when I change the tranny fluid and filter this spring.

 

You ask that question a million times, no matter what car your working on built by GM

 

Well it's a big *** mess so far. Had to get all new tranny fluid and a new gasket for the pan. Draining it wasn't too bad but it just kept leaking all night. Pluging the holes was easy. It's still taken apart atm. More later. I also put in a torque converter lockup switch so I'll tell you guys how that is too.

 

Might as well put a new filter in there while you have the pan off.

 

Will that do anything performance-wise?

 

No, but it's a good idea if you already have the pan off. It's just one of those things you do while your in there. And they are only a few dollars.

I won't hurt, at least you'll know when it was done.

 

Alright well I slapped a new filter in there (looks better, has a filter paper rather then the factory wire-mesh), and did the mod. You definately have to use your shifter like a manual shifter between 3rd-4th gear. However it DOES shift into 4th at wide open throttle. And I had to adjust my TV cable after I did the mod because it was shifting funky but now it's right on. I tried the Torque Converter Lockup Switch.. I didn't really see a difference. What should I look for with it on?


And also, I installed a set of MSD red ignition wires. $90. I noticed a difference right away. I had the stock wires installed so I figured they needed replacing. The engine rips a little harder now.

 

you will notice the lock up more if you lock it up at slow speeds and gas on it

 

Not unusual to need to adjust the TV cable. The parts you R&R'd is what the cable moves as the throttle position is changed.

For the TCC lockup switch, what is it that was added or changed? Is the stock ECM still in place and wired into the plug on the trans?

RBob.

 

Stock ecm. Just ran a wire from the top left port to the top right port and put a switch between them.

 

Some late model Corvettes have this setup, and I have one of them. That is where the idea came from as far as I know many years ago.

 

With the switch on to lock the TCC, when the shifter is in the OD (4th) position there won't be much difference. Without the over-runs engaged there isn't any engine braking. Although you should feel the lack of re-lock from an off the throttle coast to back onto the throttle. Normally the ECM unlocks the TCC on a coast.

With the shifter in D (1, 2 or 3), and the TCC locked (switch on), it should feel more like a stick car. With an off throttle decel there should be engine braking.

You may also find that if driven in OD at low speeds that the engine will tend to bog a little. This is because of the TCC being locked when otherwise it would be unlocked allowing the torque converter to work.

RBob.

 

is it bad to run with the lock up on 95% of the time???? like keeping it on by jumping the 2 terminals on the ADL plug, like whats in the tech article

 

I've noticed that using the lockup switch at speeds over 70 mph is a bad idea. It takes much longer to accellerate.

 

i still wanna know about running it in lock up at like 95% of the time is bad for it

 

I'd assume it is, since it doesn't rotate in different ways and would cause a specific wear pattern..

 

Also if you read the tech article it says not to run around with it on all the time. lol

 

this is some really good info. prolly one of the best threads ive seen. i learned a lot here thanks everyone.

 

Just an update. I've been driving the car with the holes plugged for 2 years now and it still shifts like a charm. Best mod I've done on my car for top speed. Tranny is still good and I believe this mod also gives increased fuel economy due to a slightly earlier shift point from 3rd gear to 4th. You can cruise at low rpms around 35-45mph and it won't downshift unless you really want it to.