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Technical => Drivetrain Tech => Topic started by: 347Thunder on March 23, 2010, 11:15:41 AM

Title: overdrive shifting late AOD
Post by: 347Thunder on March 23, 2010, 11:15:41 AM
Hey guys I was wondering if anyone knows how to make my AOD shift into overdrive ealier then 60mph. I have a lot of streets that I drive 45-50mph but with 4.33 gears it runs 3grand at that speed. I love the way it shifts now but it is kind of late in overdrive.
Title: overdrive shifting late AOD
Post by: V8Demon on March 23, 2010, 12:09:24 PM
Back the tension off on the TV valve.....

 Watch the following video.....

http://www.youtube.com/watch?v=6L3hNzxdiYw

Keep in mind you can adjust it tighter or looser than the video settings and that will play with your shift points a bit.....
There are 3 different types of linkages as well.  You SHOULD have the second one (the block type).... Read below:

(http://www.txchange.com/aodlift.gif)
Quote
LIFT TAB TYPE-TV CABLE ADJUSTMENT 

IMPORTANT: The AOD transmission may feel like it is shifting at the right time when the TV cable is actually way off! The transmission will work for a while and then FAIL! It is critical that you learn to set the TV exactly like this paper says. Why?
So that you will "see" how it works, know that it's right and not be fiddling with it for an hour, when and if you have some other problem.

1. Lift tab up to unlock adjustment assembly.
2. Have someone floorboard the accelerator pedal from inside the vehicle.
While the pedal is floored, push on the throttle body arm to make sure it's bottomed against its stop (wide open). (Adjust throttle cable, if necessary).
3. While the throttle is floorboarded, lock the tab on TV adjuster.
4. Make scratch with hacksaw blade or knife up tight against the adjustment assembly. This is the MAX TV mark.
5. Unlock the tab and slide housing towards bare cable 5/16" and lock tab. You can use a 5/16" bolt as a gauge. Make another mark up tight against adjustment assembly. This is the MIN TV mark.
6. Make another mark midway between MAX and MIN. This is MID-mark.
7. Adjust to MID-mark CI and road test.

ROAD TEST
In manual "3" it must have 3-2 kickdown at 50 mph (passenger cars).
CARB AND THROTTLE BODY INJECTOR MODELS: Seem to work best with setting
between MIN and MID.
PORT INJECTION MODELS (Standard): Start with a setting just under MID.
HIGH OUTPUT Port injection models: Start with setting just a hair over MID
Adding TV to attempt to correct pinging, chugging or lugging won't work. It Just causes thumps, bumps and extra wear. Set the TV so that the shifts are smooth and not late.


(http://www.txchange.com/aodblock.gif)
Quote
BLOCK TYPE-TV CABLE ADJUSTMENT 

IMPORTANT: The AOD transmission may feel like it is shifting at the right time when the TV cable is actually way off! The transmission will work for a while and then FAIL! It is critical that you learn to set the TV exactly like this paper says. Why?
So that you will "see" how it works, know that it's right and not be fiddling with it for an
hour, when and if you have some other problem.
1. Pull/push TV cable and block assembly out of throttle arm rubber grommet.
2. Have someone floorboard accelerator pedal from inside the car.
While the pedal is floored, push on the throttle body arm to make sure it's bottomed
(wide open) against its stop. (Adjust throttle cable, if necessary.)
3. Push the locking tab up through the adjustment block, with a pocket screwdriver, so that the locking tab is standing up next to clevis pin as shown in the picture.
4. While someone is holding' the throttle pedal floorboarded:
Pull the cable rail HARD towards the end of the cable with one hand, at the same time engage the clevis firmly into the throttle arm grommet.
Engaging the clevis automatically locks the tab by pushing it into the block.
5. Pull the block adjustment assembly out of the grommet:
Make a mark, on the rail, with a hacksaw blade or knife up against adjustment block.
This is the MAX TV mark.
6. Make another mark 5/16" from the max mark out on the rail. (Use a 5/16 pan bolt for a gauge.) This is MIN TV mark.
7. Make another mark midway between MAX mark and MIN mark. This mark is
average or MID-mark.
8. Unlock the adjustment tab. Set on MID-mark and lock tab. (Push it down into block.)
Install into throttle arm grommet and road test.

ROAD TEST
In manual "3", must have 3-2 kickdown at 50 mph (passenger cars).
CARB AND THROTTLE BODY INJECTOR MODELS: Seems to work best with
setting between MIN and MID.
PORT INJECTIONI MODELS(Standard): Start with a setting just under MID.
HIGH OUTPUT Port injection models: Start with setting just a hair over MID.


Quote
ROD TYPE-TV ADJUSTMENT

1. Remove the air cleaner. Have someone floor the gas pedal from inside the car while you bend the THROTTLE cable bracket until the butterfly arm bottoms solidly on it's stop.
2. Turn the adjustment screw IN until 13 threads are sticking out the front of the adjuster arm. (Approx. 7/16")
3. Start the engine with the AIR OFF and leave it OFF.
4. While the engine is idling, loosen the adjustment bolt on the arm on the side of the transmission with a 13mm socket one full turn. Push the arm up (towards the top of the vehicle) and gently tighten the bolt.
5. Now go back to the top adjustment and back off 13 turns.
6. Now ROAD TEST. Place the selector in the '3' position and cruise at 45 mph. Floor the throttle, you will have no 3-2 kickdown. Turn the adjuster screw in exactly one turn at a time until you have kickdown at 45 mph. Then, turn the screw in 3 more turns. You will be in the middle of the TV adjustment.
7. Now ROAD TEST for shift feel and timing. You can adjust in or out up to 2 turns to improve shift quality.
8. Replace the air cleaner.
Title: overdrive shifting late AOD
Post by: 347Thunder on March 23, 2010, 01:01:52 PM
I have the lokar cables. So if I just set it snug with the throttle closed that should be good? Do I need to do a pressure test?
Title: overdrive shifting late AOD
Post by: thunderjet302 on March 23, 2010, 11:54:26 PM
Make sure that the cable has neither tension nor is slack when it's in the grommet.
Title: overdrive shifting late AOD
Post by: V8Demon on March 27, 2010, 01:53:24 PM
Tension is acceptable so long as the throttle can open fully.
Title: overdrive shifting late AOD
Post by: ZondaC12 on March 27, 2010, 10:54:02 PM
Yeah I'm personally rather shocked that it waits til that speed given the gears you have. Your sig says "custom built" so maybe it's got a real high-rev governor? And of course could be a combination of that and the TV cable *too* tight, as said.
Title: overdrive shifting late AOD
Post by: 347Thunder on March 28, 2010, 12:10:04 AM
actually the tv cable is quite loose with the throttle closed. I fixed the setting and it still shifts late.
Title: overdrive shifting late AOD
Post by: V8Demon on March 28, 2010, 12:14:18 AM
Quote from: ZondaC12;316144
Yeah I'm personally rather shocked that it waits til that speed given the gears you have. Your sig says "custom built" so maybe it's got a real high-rev governor? And of course could be a combination of that and the TV cable *too* tight, as said.


The governor only comes into play @ WOT.  At part throttle and light load situations, line pressure is the key ingredient.
Title: overdrive shifting late AOD
Post by: thunderjet302 on March 28, 2010, 12:59:40 AM
How accurate is your speedometer?
Title: overdrive shifting late AOD
Post by: 347Thunder on March 28, 2010, 03:22:29 PM
it is dead on gps said so
Title: overdrive shifting late AOD
Post by: thunderjet302 on March 28, 2010, 04:00:34 PM
I bet your cable is too tight. Can you get a pressure gauge on it to see what the TV pressure is at idle?
Title: overdrive shifting late AOD
Post by: 347Thunder on March 28, 2010, 10:48:23 PM
the only way I can get it to go into od at 60 I have to speed up then let off the gas then it goes in. I don't think it is too tight because their was a little slack on the line when the throttle is closed. Does this have something with the servo and it will never go into od under full throttle.
Also does anyone have a closeup picture of the plug to check the pressure
Title: overdrive shifting late AOD
Post by: V8Demon on March 29, 2010, 10:22:36 AM
Sounds like something's sticking in the valvebody.....