Author Topic: 1990 mustang gt auto?  (Read 5957 times)

mustanglx5.0

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1990 mustang gt auto?
« on: May 01, 2011, 12:03:32 AM »
im driving my pretty much stock gt with some add ons. and the auto trans is shifting so weird seemd like its going bad.
im on the highway at 70 and my rpms are at almost 5?
the OD shifts so hard and when im cruising and let go of the gas then accelerate the trans takes a while to shifht and go?
idk please help me out thanks
if you need more info let me knw

Konrad

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Re: 1990 mustang gt auto?
« Reply #1 on: May 01, 2011, 12:14:28 AM »
yeah does not sound good. first thing to check is your fluid level. Most automatics you have to run them first, warm them up good, and then immediately check the fluid while it's still running to get an accurate reading. Other than that, if the fluid is ok, take it in to a good transmission shop is all I can suggest.

mustanglx5.0

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Re: 1990 mustang gt auto?
« Reply #2 on: May 01, 2011, 12:20:38 AM »
yea thanks allot, i checked the fluids and there all good. so from what your saying the trans is going

Konrad

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Re: 1990 mustang gt auto?
« Reply #3 on: May 01, 2011, 01:43:28 AM »
Well I think we all know it's not supposed to operate like that...

It may be fixable but most people don't have the expertise to be working on auto transmissions. Gotta take that to a shop.

70_Cougar

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Re: 1990 mustang gt auto?
« Reply #4 on: May 07, 2011, 08:02:25 AM »
on the highway at 70 and my rpms are at almost 5?
If the ring and pinion gears have been changed you could see this....otherwise your AOD is never shifting into overdrive.

the OD shifts so hard and when I'm cruising and let go of the gas then accelerate the trans takes a while to shift and go?
These transmissions do NOT use electronics to determine shift point and internal hydraulic pressures.  They also do not use engine vacuum to determine engine load.  These transmissions use feedback by linkage or cable (cable in your case) to tell the transmission how hard you are pushing the engine.  This is done by a cable connected to the throttle body and it follows FULL stroke of the throttle

In Fords infinite cheap ass wisdom, they used a plastic bushing for the feedback cable to attach to the throttle body linkage.

So what happens when the bushing breaks apart and the end of the throttle feedback cable falls out?   

If the cable falls out at the idle or low throttle position and stays there, very little transmission internal hydraulic pressure is applied inside the transmission.  The transmission will shift early also.  If you apply any horsepower at all to a transmission in this condition it will slip the bands and clutches and burn them up.

If the cable falls out near the full throttle position and stays there, The internal transmission hydraulic pressure is very high. Your transmission will shift late and hard and will never go into overdrive.

Aftermarket makes a brass or bronze Bushing to replace their poorly engineered plastic version that have cost the public untold millions in transmission repair.

John

Rat Fink

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Re: 1990 mustang gt auto?
« Reply #5 on: May 07, 2011, 09:41:53 AM »
Clutches

poisonivy24

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Re: 1990 mustang gt auto?
« Reply #6 on: June 27, 2011, 09:23:53 PM »
I don't understand John's explanation, I am also thinking of learning this parts and do it on my own but it is really hard. Anyway I just got my car in a car shop because of the same problem.

70_Cougar

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Re: 1990 mustang gt auto?
« Reply #7 on: June 28, 2011, 08:07:35 PM »
I don't understand John's explanation,


Ivy,  ask away.  I will try to explain.

John

 

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