Tranny bangs into drive
Thread Starter
Racer
Joined: Oct 2001
Posts: 490
Likes: 0
From: Methuen Ma
Tranny bangs into drive
I hope you guys can help. My '84 stock Auto coupe bangs into drive, I've replaced all the u-joints and it still does it. This isn't normal is it? Also if i put in drive to start out she will shift into 3rd by 25-27 mph if I'm driving normal and not pushing her. this doesn't seem right to me, any advice would be appreciated
thanx
Scott
[Modified by MyC-4, 11:38 AM 10/7/2001]
[Modified by MyC-4, 11:54 AM 10/7/2001]
thanx
Scott
[Modified by MyC-4, 11:38 AM 10/7/2001]
[Modified by MyC-4, 11:54 AM 10/7/2001]
Original Founding Member!
Joined: Jul 1999
Posts: 9,037
Likes: 88
From: Granby, MA
Cruise-In 1, 3, 9. 10 & 11 Veteran
Re: Tranny bangs into drive (MyC-4)
Hello...gosh I think Iam beginning to become an expert on this thing....the tv cable and adjustment....lol.....
well to start you off.....no tv cable is not standing for television...lol.....its throttle valve cable it is the cable that is connected from your throttle body to your transmission. Its sole perpose is to control forced upshifts and valve pressure to the transmission.....it has a direct co-relation to your accelerator cable as well....when you press the gas down you place tension on this cable and at wide open throttle the cable with have a certain amount of tension on it....thus allowing the transmission to engage firmer, softer, as well as faster and slower...from my experience for every click the tv cable is adjusted one way or another there is actually two settings....one is shift characteristics....the firmness or hardness the car shifts and how fast or slow it shifts......for example...when I have placed my cable on say the 15 click setting the car shifts out of first at 13 mph (if you run the car normal and don't get on it)......now if I set the setting up or down one, the shift speed remains the same however the firmness with go up or down......feel harsher or softer.......so the bottom line is you need to adjust it to keep a balance of both shift speed and firmness.......this is the ultimate goal....and in turn will prevent premature wear or burned clutches.......
this can be accomplished a couple of different ways.....the first, and is what GM recommends is a tv cable reset.....
the proceedure for this is simple: under the hood and connected to your throttle body, you will have a reset box in which the tv cable runs through......its square usually black and has a place in which you can push in......
you simply push in on the box and then pull the sleeve of the tv cable toward the rear of the car till it will not go any further.....
this is known as absolute tv tension.....
now you will prob need a friend to help you out on this part.....four hands being better than two.....you have to continue to push that button in on the reset box WHILE holding onto the sleeve....otherwise the cable will just snap all the way forward.....so....
while holding onto the sleeve and pushing the button in, you have someone open the throttle all the way up.....(either floor the gas while in the car or open using the thottlebody under the hood).....obviously don't have the car running .....WHEN THEY DO THIS HOLD ON TIGHT TO THE SLEEVE.....it will want to move......but at the same time the cable that rides in it will.....YOU WILL HEAR CLICKING NOISES......when you have the throttle all the way open release the button and let go of the sleeve....now you have effectively put the tv cable back to factory reset position......and I would say 8 times out of 10 it will be fine and fix any tv cable related problems.....BUT.......
if for some reason your not happy....and feel she is shifting too hard or soft....or early or late.....from this reset position you can push that button in again....and at the same time hold onto that sleeve...(again she will want to snap forward).....then move the tv cable one little (and i mean very little) movement either front or back......to the front of the car will equal a faster shift and usually less firm of a tranny shift while toward the back results in a more delayed tranny shift and usually a firmer setting.......
of course the best way is you will have to try all this and see what you like .....all vehicles respond differently.....just remember...the tv cable was never met to change the shift points or firmness to the transmission.....so don't use it for that......just use it to get the car back to factory or a stock feeling......if you want to fool around with firmness or shifting ....you have to modify the tranny......hope this helps.......I know with mine i had to learn all this too.....cause mine was behaving a bit weird too.....just for your reference.....mine shifts out of first at like 12-13mph when I don't get on it ....just let it idle or barely touch the gas......when giving it WOT, she pulls like crazy and has a nice kick you back into the seats going into second......sometimes even chirps the gear.......
well good luck
Jeff :chevy :flag
[Modified by XtremeVette, 4:04 PM 10/7/2001] :smash:
[Modified by XtremeVette, 4:13 PM 10/7/2001]
well to start you off.....no tv cable is not standing for television...lol.....its throttle valve cable it is the cable that is connected from your throttle body to your transmission. Its sole perpose is to control forced upshifts and valve pressure to the transmission.....it has a direct co-relation to your accelerator cable as well....when you press the gas down you place tension on this cable and at wide open throttle the cable with have a certain amount of tension on it....thus allowing the transmission to engage firmer, softer, as well as faster and slower...from my experience for every click the tv cable is adjusted one way or another there is actually two settings....one is shift characteristics....the firmness or hardness the car shifts and how fast or slow it shifts......for example...when I have placed my cable on say the 15 click setting the car shifts out of first at 13 mph (if you run the car normal and don't get on it)......now if I set the setting up or down one, the shift speed remains the same however the firmness with go up or down......feel harsher or softer.......so the bottom line is you need to adjust it to keep a balance of both shift speed and firmness.......this is the ultimate goal....and in turn will prevent premature wear or burned clutches.......
this can be accomplished a couple of different ways.....the first, and is what GM recommends is a tv cable reset.....
the proceedure for this is simple: under the hood and connected to your throttle body, you will have a reset box in which the tv cable runs through......its square usually black and has a place in which you can push in......
you simply push in on the box and then pull the sleeve of the tv cable toward the rear of the car till it will not go any further.....
this is known as absolute tv tension.....
now you will prob need a friend to help you out on this part.....four hands being better than two.....you have to continue to push that button in on the reset box WHILE holding onto the sleeve....otherwise the cable will just snap all the way forward.....so....
while holding onto the sleeve and pushing the button in, you have someone open the throttle all the way up.....(either floor the gas while in the car or open using the thottlebody under the hood).....obviously don't have the car running .....WHEN THEY DO THIS HOLD ON TIGHT TO THE SLEEVE.....it will want to move......but at the same time the cable that rides in it will.....YOU WILL HEAR CLICKING NOISES......when you have the throttle all the way open release the button and let go of the sleeve....now you have effectively put the tv cable back to factory reset position......and I would say 8 times out of 10 it will be fine and fix any tv cable related problems.....BUT.......
if for some reason your not happy....and feel she is shifting too hard or soft....or early or late.....from this reset position you can push that button in again....and at the same time hold onto that sleeve...(again she will want to snap forward).....then move the tv cable one little (and i mean very little) movement either front or back......to the front of the car will equal a faster shift and usually less firm of a tranny shift while toward the back results in a more delayed tranny shift and usually a firmer setting.......
of course the best way is you will have to try all this and see what you like .....all vehicles respond differently.....just remember...the tv cable was never met to change the shift points or firmness to the transmission.....so don't use it for that......just use it to get the car back to factory or a stock feeling......if you want to fool around with firmness or shifting ....you have to modify the tranny......hope this helps.......I know with mine i had to learn all this too.....cause mine was behaving a bit weird too.....just for your reference.....mine shifts out of first at like 12-13mph when I don't get on it ....just let it idle or barely touch the gas......when giving it WOT, she pulls like crazy and has a nice kick you back into the seats going into second......sometimes even chirps the gear.......
well good luck
Jeff :chevy :flag
[Modified by XtremeVette, 4:04 PM 10/7/2001] :smash:
[Modified by XtremeVette, 4:13 PM 10/7/2001]
Safety Car
Joined: Dec 2000
Posts: 3,767
Likes: 5
From: Jacksonville Fl
Re: Tranny bangs into drive (MyC-4)
84 trans?
Well, if it's original...it does not have the auxillary valve body. That was a feature added in 86/87 to eliminate "bang" into gears from park or reverse.
It also eliminated failure of the trans that was caused by this bang if you went from rev-drive-rev-drive at more than idle throttle positions ( as sensed by the TV cable ). Basically, it prevented failure from rocking the car between drive and reverse as in being stuck in sand.
The real reson your trans "bangs" into gear is excessive clutch pack clearance. This can be caused by not setting it correctly on rebuild or simply from having clutch plate wear. Many hi mileage trannies do this...with or without the aux valve body.
My suggestion is to have it looked at by a professional transmission mechanic. If you do happen to have the original trans, you would be better served ( functionality wise ) by replacing it with a 87 or newer transmission...87 was the first year model to have all longevity/torque capacity improvements incorporated, and it will fit your car.
Well, if it's original...it does not have the auxillary valve body. That was a feature added in 86/87 to eliminate "bang" into gears from park or reverse.
It also eliminated failure of the trans that was caused by this bang if you went from rev-drive-rev-drive at more than idle throttle positions ( as sensed by the TV cable ). Basically, it prevented failure from rocking the car between drive and reverse as in being stuck in sand.
The real reson your trans "bangs" into gear is excessive clutch pack clearance. This can be caused by not setting it correctly on rebuild or simply from having clutch plate wear. Many hi mileage trannies do this...with or without the aux valve body.
My suggestion is to have it looked at by a professional transmission mechanic. If you do happen to have the original trans, you would be better served ( functionality wise ) by replacing it with a 87 or newer transmission...87 was the first year model to have all longevity/torque capacity improvements incorporated, and it will fit your car.
