Thread: Driveability issues

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AOD with lock up torque converter.

A lock up converter will cause that bucking, etc as you come to a stop----several things to check-------and don't forget the brake light switch as that is a disconnect for the converter -------

I have an AOD but didn't go with the lockup converter. I had a devil of a time with stacked shifts and being in OD way to early, then it wouldn't downshift reliably.

I installed the Transgo AOD Hi-Rev kit that I picked up from Summit, and it fixed all my shifting errors. With the lockup converter, depending how it's wired, you'll have another layer of complexity to diagnose / verify. Most of my problems were in the governor, but I did find a couple small issues inside the valve body, sticking spool valve was one of them.

What ring/pinion ratio? I've got 3.9:1 in mine and the stock governor just doesn't deal well with them. Also, have you verified the throttle valve pressure? This can influence the shift points too.

I don't have a AODE so every thing is mechanical. I'm running a 3:50 LS gear and run about 2000 RPM at 70 which is close to where I wanted to be. I have found a local transmission guru and I'm going to give him a shot at fixing it. I've run everything from 35psi to 80psi trying to get it to shift better. Gearstar sent me a new governor but it didn't make any difference at all. I'm getting a lot of all AOD transmissions do that stories and so it is very disappointing. I should have stuck with the tired but true 350/350 Chevy set up but this is a Ford and it deserves a Ford engine. I have nothing against Chevy and if this was a Chevy car, I would have a Chevy in it.

You do or do not have a lock up converter?????????If you do and you don't have the brake lite switch hooked to it the lock up converter won't dis engage and it WILL buck when coming to a stop---just like you describe in post #1

Originally Posted by Proeagles

I don't have a AODE so every thing is mechanical. I'm running a 3:50 LS gear and run about 2000 RPM at 70 which is close to where I wanted to be. I have found a local transmission guru and I'm going to give him a shot at fixing it. I've run everything from 35psi to 80psi trying to get it to shift better. Gearstar sent me a new governor but it didn't make any difference at all. I'm getting a lot of all AOD transmissions do that stories and so it is very disappointing. I should have stuck with the tired but true 350/350 Chevy set up but this is a Ford and it deserves a Ford engine. I have nothing against Chevy and if this was a Chevy car, I would have a Chevy in it.

Since it is an AOD, chat with the guys here, they know the AOD inside and out, front and back, top to bottom. They helped me get to the bottom of problem.

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And the throttle valve pressure - at idle, should only be a pound or two, if yours is making 35, it's way out of range. But, if you're quoting the 35 pounds at idle with the gauge block installed in the throttle linkage, try backing it down to 30 / 32 psi. It may help the shift points but I think the "bucking" is a different issue.

The AOD is a good tranny, like most things once the setup is completed and tuned, it'll work as you expect.

Originally Posted by 34_40

Since it is an AOD, chat with the guys here, they know the AOD inside and out, front and back, top to bottom. They helped me get to the bottom of problem.

Click Click Racing Forums

And the throttle valve pressure - at idle, should only be a pound or two, if yours is making 35, it's way out of range. But, if you're quoting the 35 pounds at idle with the gauge block installed in the throttle linkage, try backing it down to 30 / 32 psi. It may help the shift points but I think the "bucking" is a different issue.

The AOD is a good tranny, like most things once the setup is completed and tuned, it'll work as you expect.

At idle the pressure is at or near zero just as it is supposed to be. Once I get the trans to shift down as it slows down, the bucking will stop. The surging will probably continue because of the cam and intake not liking low RPM. I went for a ride in a friend's Cobra with a Victor Jr intake single plane and it surged like crazy loping along. Thank goodness it had a standard transmission.

Yeah, it sounds like your throttle valve pressure is good. What is the stall of your convertor? I went with a 1800/2000 stall so that I could use the trans to help run the rpm's in a higher range since I was going to use a high rise manifold. Add in the 3.9 rear ratio and the combo is quite smooth.

I can honestly say I haven't heard of an AOD causing a bucking and surge. But I haven't known anyone using a lockup convertor either.

What happens when your decelerating and kick the trans in neutral? Can you "feel" or hear the tranny shift down as the car comes to a stop? And something else that jumps out at me - you say in the reply above, "Once I get the trans to shift down as it slows down, the bucking will stop." but how are you getting the trans to shift down? It is the job of the govenor to place the trans in any particular gear, unless you have a modified or manual valve body? Even a stock valve body won't drop the trans a gear if you shift down with the shift handle. The govenor will wait for the correct rpm to shift.