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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 04-11-2014, 10:07 PM   #1
mongolchuck
1st Gear Member
 
Join Date: Feb 2007
Vehicle: 1991 LX Convertible
Location: IA
Posts: 147
Default AOD no reverse

91 lx vert 5.0. Supposedly has a rebuilt aod with shift kit. Fluid is new and full. I can start it up pop it in reverse and it will go. Let it warm up some and reverse no longer works. It feels like its in neutral. Forward works fine no matter the temp. I've looked all over and people have similar problems but they never post what fixed it. I have set the TV cable. I've read about the servo but was wondering if there were any people who have had this problem and actually fixed it and what fixed it.
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Old 04-14-2014, 10:25 PM   #2
aode08
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Join Date: Oct 2005
Vehicle: 91 Mustang GT
Location: Ohio USA
Posts: 4,614
Default

This is a very old and very common problem,USUALLY THE TRANNY TECH TORQUES THE VALVE BODY BOLTS ONCE.

Drop the pan and check your valve body bolts.
Bet they loosened up, if they did, your going to have to replace the gaskets and re-torque the bolts, 3 TIMES

Personally, the guy that rebuilt it would be getting it back,it totally sucks I know.
The techs are good at re-using parts that look good,especially seals that are not included with a cheap overhaul kit,it how they make money, however, you cannot do this with a AOD.You need the expensive overhaul kit.
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Last edited by aode08; 04-14-2014 at 10:29 PM.
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Old 04-25-2014, 09:54 PM   #3
mongolchuck
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Join Date: Feb 2007
Vehicle: 1991 LX Convertible
Location: IA
Posts: 147
Default

OK dropped the pan. There is a little fine material in the pan and on the magnet. I think its from having to rev it some to back it out of the garage. The fluid is clear. The valve body bolts were tight. I took the valve body off and checked the servos. Pulled the reverse/first servo and it has been replaced. Servos and covers are cheap so I want to replace those. Here's the question: the servo I took out is a single groove and therefore I should replace it with a single groove; but what if the original replacement was the wrong one? What is the difference between the three reverse/first servos? How do I know which one is the correct one?
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Old 04-26-2014, 10:17 AM   #4
mongolchuck
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Join Date: Feb 2007
Vehicle: 1991 LX Convertible
Location: IA
Posts: 147
Default

The more I think about it I'm doing what I hate; throwing parts at something without knowing the exact problem. I keep thinking maybe the band or clutches are worn. Looks like I'll be pulling it out and tearing it apart. I'll pick up an overhaul manual but anything in particular I need to look for? I've only had experience rebuilding t5s.
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Old 04-26-2014, 10:17 AM
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