Trans adjustment?

[bhw33191]

Is it possible to adjust the trans myself? I recently had it rebuilt, it runs great except i want to adjust it so it downshifts earlier and i dont have to stuff the pedal. I know its suppose to downshift when the gas is half way (while under 35 or 40 i think) but right now it does it at more like 2/3. I have no knowledge about my transmission but do i adjust it by twisting the cable right where it connects to the trans? Or does it have to do with where that cable goes in the engine compartment?

[Blt2Lst]

Try adjusting the TV (throttle valve) cable up by the carb or Throttle Body.
Do a search on the forum for TV cable adjustment.
If this is not adjusted correctly, the trans will not shift properly and will make your car seem like a slug.

Good luck

Just found this link, hope it helps.
http://www.tvmadeez.com/article/index.php

[MagicRat]

Originally Posted by Blt2Lst

If this is not adjusted correctly, the trans will not shift properly and will make your car seem like a slug.

Not only does it cause poor shifting, you can burn-up the trans if its way off. The TV cable controls transmission line pressure among other things. Improper adjustment might mean the clutch packs have insufficinet hydraulic pressure to prevent slippage, thus burning up your clutches.

Adjusting the TV cable is easy. You just have to make sure that when the gas pedal is floored, the TV cable is pulled out all the way from its housing.

So..... disconnect the TV cable at the carb. Pull the TC cable out all the way by hand. Use a magic marker to mark the cable just where it emerges from the cable housing.
Now, reconnect the cable and have someone floor the gas pedal. Look for the mark. If it appears, then the TV cable is extended all the way. Gently tug on the TV cable and make sure there is no slack. Adjust if required to make the mark appear and eliminate all slack when the gas pedal is floored.

BTW this was the procedure that appears in the Haynes GM automatic transmission rebuild manual.

[deesandvees]

What trani do you have? From what I know, the TV cable can't be "adjusted". It has 1 set position that is correct and all other positions are wrong. I recommend reading this info put out by Bowtie Overdrives:

http://www.tvmadeez.com/article/index.php

There's a lot there but it is very smart and you'll understand how the TV controls all functioning of the transmission.
A quote from the article, "It would be a gross understatement to say that the TV valve and the fluid feed hole it manages are critically important to the Th-700R4 and Th-2004R!"

I'm dealing with this now as I've recently had my 700R4 rebuilt by a local transmission shop that was supposed to be so great. Now I realize that they don't hardly know what they're doing. I have an Edelbrock carb and they specifically installed the factory 700R4 TV cable, they don't even know enough to know that an Edelbrock carb has a 1/4" shorter throw than the factory quardrajet which means the TV cable will only perform correctly at a certain throttle position. My trani blew up after 5,000 miles and luckily they "fixed" it for me but I'm crossing my fingers now. They boasted and bragged about how this transmission will handle 400lbs of torque, my car puts out just about 300lbs and when it busted they said I must have been abusing it and this was a hot rod so I was lucky they warrantied it. They build drag racers there and I'm guessing stuff breaks all the time with those but they just figure it's "abuse". The TV Made Easy article opened my eyes to all this.

[j cAT]

Originally Posted by MagicRat

Not only does it cause poor shifting, you can burn-up the trans if its way off. The TV cable controls transmission line pressure among other things. Improper adjustment might mean the clutch packs have insufficinet hydraulic pressure to prevent slippage, thus burning up your clutches.

Adjusting the TV cable is easy. You just have to make sure that when the gas pedal is floored, the TV cable is pulled out all the way from its housing.

So..... disconnect the TV cable at the carb. Pull the TC cable out all the way by hand. Use a magic marker to mark the cable just where it emerges from the cable housing.
Now, reconnect the cable and have someone floor the gas pedal. Look for the mark. If it appears, then the TV cable is extended all the way. Gently tug on the TV cable and make sure there is no slack. Adjust if required to make the mark appear and eliminate all slack when the gas pedal is floored.

BTW this was the procedure that appears in the Haynes GM automatic transmission rebuild manual.

marking this where it was then adjusting to the next position is usually all that is needed...it should down shift at half throttle...that way there is less stress on the drivetrain and transmission.

[Blt2Lst]

Originally Posted by MagicRat

Adjusting the TV cable is easy. You just have to make sure that when the gas pedal is floored, the TV cable is pulled out all the way from its housing.

When I adjust mine, I remove the floor mat so the pedal goes all the way to the floor. The factory mats are thick enough to throw off the adjustment.

[silicon212]

Here's an old post that I made regarding the adjustment.

[bhw33191]

I just have one thing i'd like to mention. How come i can't do a burnout? It seems pretty pathetic that i can't even manage to do one. I don't usually try to do this and i dont abuse my car like this but i was just curious one day and wanted to see what it'd do...and nothing happened. The tires i put on this thing are bigger than the ones it originally had on, but they're the biggest "factory" size so that shouldn't even matter. And yes i know i have the 305 but you'd think it could do better than that right??

So i was a little worried that maybe its because they didn't adjust my trans correctly when i had it rebuilt a month ago..I'm suppose to bring the car back to them so they can check the bolts and stuff, but i'm not sure if i should mention how it can't do a burnout, or can't even spin the wheels unless its aided by sand or sidewalk paint.

[Blt2Lst]

Originally Posted by bhw33191

I just have one thing i'd like to mention. How come i can't do a burnout?

Chances are your car does not have enough power or gearing to do one..

[bhw33191]

Originally Posted by Blt2Lst

Chances are your car does not have enough power or gearing to do one..

My car definately has the high way gears so maybe this has something to do with it also?

[j cAT]

Originally Posted by bhw33191

My car definately has the high way gears so maybe this has something to do with it also?

the rear end dif gearing is not designed for the sport minded owner,,,but for an old person driving about town doing 30mph...

with a full tank of fuel impossible to do burn outs....if you remove the back seat totally this will reduce the weight and you will be able to burn out your tires easy...also remove the spare and put about 35psi in the rear tires...

on my 96 I also find with the positraction that the rear tires rarely slip...but I don't step on the throttle like I'm trying to kill a cockroach..tires wear out at 30,ooomi very soft rubber very expensive ...but good traction on dry pavement..I try to avoid this...burning out..

over sized tires do give a better ride and last longer...If you have the larger sized tires this will greatly reduce tire slippage..\

what size do you have on there ?

[bhw33191]

Originally Posted by j cAT

the rear end dif gearing is not designed for the sport minded owner,,,but for an old person driving about town doing 30mph...

with a full tank of fuel impossible to do burn outs....if you remove the back seat totally this will reduce the weight and you will be able to burn out your tires easy...also remove the spare and put about 35psi in the rear tires...

on my 96 I also find with the positraction that the rear tires rarely slip...but I don't step on the throttle like I'm trying to kill a cockroach..tires wear out at 30,ooomi very soft rubber very expensive ...but good traction on dry pavement..I try to avoid this...burning out..

over sized tires do give a better ride and last longer...If you have the larger sized tires this will greatly reduce tire slippage..\

what size do you have on there ?

Yeah i was thinking, its for my own good that i can't do a burnout or else i'd be going through tires like hot cakes lol. But as for the size.. i believe it originally had the skinny little 205 75's and i went up to 215 75's, enough to give it a better "stance" but i might go bigger next time if possible. My tire pressure has also been a little low and i got a full size spare tire in the back with a subwoofer, amp, and a small a 30lb tool box...although any good car could spin tires without having to strip it bare. Its not like i want to do one THAT bad. Whatever like i said its for my own good especially since its my first car.

[Blt2Lst]

Originally Posted by j cAT

if you remove the back seat totally this will reduce the weight and you will be able to burn out your tires easy...

I doubt that, the back seat really does not weigh that much.
Why don't you try a 100 shot of Nitrous if you really want to lite up the tires..

[bhw33191]

Originally Posted by Blt2Lst

I doubt that, the back seat really does not weigh that much.
Why don't you try a 100 shot of Nitrous if you really want to lite up the tires..

Pfff...nitrous..i don't use drugs.

[j cAT]

Originally Posted by Blt2Lst

I doubt that, the back seat really does not weigh that much.
Why don't you try a 100 shot of Nitrous if you really want to lite up the tires..

the reason I know this is because I needED some body shop work done to my roof...this work would have exposed my like new in perfect condition velour seats TO body shop crud...so I removed all the seats,including the rugs...left the driver seat in it to drive it but rapped securly with plastic...when I pulled out of the driveway the rear wheels spun like with 1/4 throttle...

now this vehicle could spin the tires but it would take a heavy foot to the throttle for that to happen MAYBE!..