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Old 10-15-2009, 08:31 AM   #1
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AODE Shifting problem

Hey folks. I have a 95 GT with an automatic transmission. I recently started having problems shifting. When I am going at partial throttle, the car will hickup when shifting from 1 to 2 (kinda feels like it is either going into neutral then back to first or all the way to second and back to first, but happens too fast for me to really know what it is doing). After the speed/rpms go up a little more, it shifts fine from 1 to 2. At WOT, the shift is fine. When decelerating, the transmission will wait too long to shift from 2 to 1 -- usually it will do it at 300-400 rpms and nearly stall the car.

The problem happened suddenly. I drove it in the morning and it shifted fine. Drove it that evening and I started having problems.

I had searched and saw that some people have said that the MLPS (trans range sensor) will cause strange shifting problems. Others have said that the 1-2 accumulator and/or springs may cause similar problems. The transmission was rebuilt about 4 years ago and I've probably only put on 40k miles since then.

Just want to know what you folks think and where I should start looking.

Thanks,
Chuck
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Old 10-15-2009, 08:47 AM   #2
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Originally Posted by MustangChuck View Post
I had searched and saw that some people have said that the MLPS (trans range sensor) will cause strange shifting problems.
That sounds pretty likely.
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Old 10-15-2009, 08:07 PM   #3
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Quote:
Originally Posted by MustangChuck View Post
Hey folks. I have a 95 GT with an automatic transmission. I recently started having problems shifting. When I am going at partial throttle, the car will hickup when shifting from 1 to 2 (kinda feels like it is either going into neutral then back to first or all the way to second and back to first, but happens too fast for me to really know what it is doing). After the speed/rpms go up a little more, it shifts fine from 1 to 2. At WOT, the shift is fine. When decelerating, the transmission will wait too long to shift from 2 to 1 -- usually it will do it at 300-400 rpms and nearly stall the car.
The shift is determined by vehicle speed (VSS) and TB position. RPM is just a by product

Quote:
I had searched and saw that some people have said that the MLPS (trans range sensor) will cause strange shifting problems.
That would be the first place to look.
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Old 10-17-2009, 08:20 AM   #4
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Is the VSS used for any other inputs in an automatic car? Just wondering if the VSS could be going out. I know the TB position sensor is used elsewhere, so I doubt that is the problem.

Where is the MLPS located? If it is in the transmission, is it accessible without dropping it?

Thanks,
Chuck
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Old 10-17-2009, 09:40 AM   #5
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Where is the MLPS located? If it is in the transmission, is it accessible without dropping it?
It's outside the transmission on the driver's side so it's fairly easily accessible.
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Old 10-21-2009, 01:56 PM   #6
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It's outside the transmission on the driver's side so it's fairly easily accessible.
Many thanks!

M/C
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Old 10-21-2009, 02:37 PM   #7
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mlps is on driver side,just above the pan.
the shifter cable bolts up to it,cant miss it.
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Old 10-25-2009, 01:19 AM   #8
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Quote:
Originally Posted by MustangChuck View Post
Is the VSS used for any other inputs in an automatic car? Just wondering if the VSS could be going out. I know the TB position sensor is used elsewhere, so I doubt that is the problem.

Where is the MLPS located? If it is in the transmission, is it accessible without dropping it?

Thanks,
Chuck
The VSS is used just for that, speed reference for the ECM. The TPS can cause erratic transmission operation too, like it happened on my car beginning this year. It acts like a Throttle Valve cable, but electronic instead of mechanical. Mine started to hold and release 1st gear on D, then shifted normaly on D2 from 1st to 2nd, and stuck there even when shifting back into D until I hit 50+ mph, then when going into a stop, all the process started again Since the TPS is not too expensive, change it anyway since it takes a beating. Mine went for $40 in Autozone. No more tranny problems since then.
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Old 10-26-2009, 03:04 PM   #9
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Thanks for the input folks. I changed out the transmission range sensor and that didn't fix the problem. Since I didn't have it adjusted right (and didn't know there was adjustments to be made), I had it towed to the dealership (fearing they sold me a bad sensor). (Car wouldn't start -- starter wouldn't even activate.) They got it adjusted and I was talking with the tech. He feels it is more mechanical. He mentioned the torque converter three times as a possibility, as well as the accumulators and maybe a sticking valve. Sounds like a rebuild (again) is on the horizon.

M/C
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Old 10-26-2009, 03:06 PM   #10
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Quote:
Originally Posted by Davis3 View Post
mlps is on driver side,just above the pan.
the shifter cable bolts up to it,cant miss it.
On your back, in the driveway with only low profile ramps and jack stands, it's also pretty easy to smell (almost had my nose on it). Not terribly difficult to remove, if you have small hands. Just need to know that you have to line up the neutral line markings or the car won't start.

M/C
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