4R70W slipping in overdrive - TCCoA Forums
 
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post #1 of 4 (permalink) Old 06-30-2005, 08:20 AM Thread Starter
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4R70W slipping in overdrive

Is it common for a 99GT 4R to have slipping OD? I would think it would last a little longer than that. What are the steps to take to diagnose the slippage? I know quite a bit about AOD's, and only assume the 4R will play the same games - but the electronics are somthing I am not sure will play with this symptom?

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post #2 of 4 (permalink) Old 06-30-2005, 11:59 AM
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If a 99 GT is slipping the OD band already, I'd suspect it's been abused (high throttle/WOT upshifts into 4th).
As long as the servo is undamaged, the EPC is providing enough pressure, and the shift solenoids work correctly, then the band is about all thats left to go wrong. I dont see many problems inside the VBs like the aod's can have.

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post #3 of 4 (permalink) Old 06-30-2005, 12:28 PM Thread Starter
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Thanks, How do I check the EPC pressure? If that is off then I would then proceed to the selinoid/valve. Otherwise I would assume the band if those checked out.

What do you mean by AOD VB problems related to OD........never had any OD related problems due to VB. What is your expereince you are speaking about? Just to keep me on top my game.

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post #4 of 4 (permalink) Old 06-30-2005, 11:15 PM
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I was just referring to the AOD VBs being quirky in general. To get the shift points right with different combinations and such it sometimes takes multiple tries to get it right... luckily that's one area I think they've improved over the years.

I forget which tap is which on the case, but they should be marked - so a pressure guage on there would be the best shot for finding the line pressure. Dirtydog probably has the best insight on that info. You could also check the resistance of the solenoids, they're listed in the later sections of the OD 101 piece IIRC. I still bet the car was shifted into OD at WOT though, the later trannies are usually good about normal use OD shifting.

96 Mustang GT 5spd. w/ 248A Option (GTS). Stock for now until I get the Roush on.

97 Thunderbird 4.6L LX /w Sport Package
24k B&M Cooler, 1" lowered, Steeda UD Pulleys, Dynomax cat-back, J-mod, 3.73's, PI intake, PI cams, 03 GT MAF/Tube, SCT tuned - Gone but not forgotten.
MAMN12 Drag Racing Team [email protected] In need of updated times.
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