Just bought my first Mustang. This 99' automatic GT has 50K miles. I noticed that when the car is 'warmed' up - the transmission 'slips' outa gear momentarily between 3rd and 4th gears if you are accelerating slowly at about 32-34mph. On a hard or firm type of acceleration, the 'slipping' does not occur. I first took the car to a friend who owns a tranny shop and he 'scoped' the tranny and test drove it for 20 some miles. He found no error codes. He indicated he could take it apart but there was still no guarantee he would find or correct the problem - he thought it might be in one of the trannies computer cards - but these are expensive and it still might not help. So I took the car to a local Ford Dealer who did basically the same thing and found no error codes. They talked me into changing the fluid (which didn't look bad - smell.... $115). It seemed to help for about one hour but the problem came back. I'm kinda stuck now. A friend suggested a 'shift kit' to get the pressures up. But another friend said this might do more harm. Any suggestions out there???
First off, welcome to AFM!! Sounds like the AODE guys are having some troubles today. I cant offer any advice on this subject but Im going to go looking for some answers. Hopefully someone with some knowledge on your tranny will read this thread soon and get you some help.
Jeff
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'97 GT with 80mm C&L MAF, C<rue-Flow CAI, MAC 70mm TB, Superchip, 180 thermo, B&M Ripper, King Cobra Clutch, FRPP aluminum quad/adj cable, MAC O/R H pipe, MIL's, Flows, Granatelli Solid control arms, FRPP 4.10's, FRPP aluminum driveshaft, Fidanza aluminum flywheel, FRPP 9mm wires, TMD aluminum U/D pulleys, Steeda full length SFC's (welded in), and 17" polished aluminum Cobra wheels with Nitto 555 Extremes, Kenwood/Alpine sound. Waiting for install: PI intake.
Keep it outta overdrive until your going faster then that. That's really slow to be putting that kinda load on the tranny. Wait till your doing AT LEAST 45. I hope you don't drive around in overdrive all the time around town. That is one of the main causes of wasting a tranny. Cause your tranny can't decide what gear to stay in when you get in and out of the gas (at part throttle) at that speed. So it's constantly shifting from OD to 3rd gear. This wastes the clutch band in OD. Just my thoughts.
I totally agree with Matt on this one. My AODE does the same thing, and I try to stay out of overdrive around town. Like Matt said, that speed in overdrive is right near the point where od kicks in. If the cruise is not on, your speed fluctuates and the tranny gets "confused"
I wish ford would have made it so you start up the car and its out of overdrive, and then have the option to turn it on. Oh well.
Later,
Jason
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99gt vert, CAI, Ford Racing Shortie Headers, MAC 2.5in catback, MAC o/r h-pipe, FRPP alum. driveshaft, March underdrive pullies, sct custom dyno tune, eibach pro-kit, bullitt alum pedals, Cobra Brake Kit, Tokico shocks and struts, PIAA bright whites...FRPP 4.10s!
You can't turn overdrive on and off? That's what I'm getting from you Jason. I'm not too familiar with the AODE tranny's. But I do know that is a rule of thumb for all tranny's to keep it outta overdrive at low speeds. I know in my x gf's cavalier when you would put in in OD at about 35 mph and let off the gas, it would constantly shift back and fourth from third to OD. This would make the idle jump about 500 rpms. It was really wierd... It was almost like a faulty IAC.
Matt, you can turn it off. What I hate is that when you fire up the car, its already in overdrive. I guess ford did this to improve milage or something. I think the car should start up out of o/d and have the option to shift to od.
Later,
Jason
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99gt vert, CAI, Ford Racing Shortie Headers, MAC 2.5in catback, MAC o/r h-pipe, FRPP alum. driveshaft, March underdrive pullies, sct custom dyno tune, eibach pro-kit, bullitt alum pedals, Cobra Brake Kit, Tokico shocks and struts, PIAA bright whites...FRPP 4.10s!
99' GT Vert AODE slipping problem 
