Ford AOD Automatic Transmission Troubles - Ford Mustang Forum
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post #1 of 17 (permalink) Old 10-03-2008 Thread Starter
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Ford AOD Automatic Transmission Troubles

Ive heard from just about everyone who owns a automatic tranmission 5.0 that they have a problem with there overdrive...ive hear that its common for it not to go into the overdrive gear...and ive hear the fix is a new OD Band...i want to know if this is true and if you can avoid this by driving your car in regular drive not overdrive?
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post #2 of 17 (permalink) Old 10-03-2008
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I have the same problem with my 90 5.0. It will shift into OD and some times makes a clunking sound that I can hear and feel. I to would like to hear from someone about this problem. I just drive it in normal drive and don't have any problems with it this way. good luck.Wish I could help.
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post #3 of 17 (permalink) Old 10-03-2008
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I don't have a problem with my overdrive. There's several things that can go wrong with an AOD, the forward clutches tend to get worn, the bands get worn, so it could be several things. But it's not a good idea to simply drive in 3rd, you need to have the trans checked.

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post #4 of 17 (permalink) Old 10-04-2008
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They have made dramatic changes to the aod since a few years ago...
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post #5 of 17 (permalink) Old 10-04-2008
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You may want to investigate the lock-up converter or input shaft.

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post #6 of 17 (permalink) Old 10-04-2008
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apparently manual shifting, and the 1-d-1 shifting is what kills the aod band the most. avoid doing this and it should last. (mine has 185,000 miles on it and works fine... a slow shift into od is the only thing) The AOD doesnt seem to be as bad as everyone says, at least if you dont beat on it, which is how every auto trans can be destroyed.

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post #7 of 17 (permalink) Old 10-04-2008
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Mine was doing that recently where it would not go into overdrive so I checked the gear selector and it had been knocked off position so check that to make sure it's precise and also adjust the TV cable all this can affect the AOD from going into overdrive.
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post #8 of 17 (permalink) Old 10-04-2008 Thread Starter
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thanks for the replies...my transmission fine right now but i just wanted to know what to check for if the problem occurs
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post #9 of 17 (permalink) Old 10-04-2008
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When I changed my stock OD servo to an A plus, my overdrive shifts were tight and fast..if you do this, be sure to have your servo pin into the tranny band when it is inserted back into the accumulator bore.

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I installed an Explorer intake and injectors and my AOD now seems to shift into overdrive with less lag and clunking.

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well from freinds o/d usually went out if you say racing in 4th gear(o/d) soo ive always kept mine in d till i run outta gear(about 130 or so maybe more)

so id say leave it in d in city/driving use then o/d for 60+(stock gears)...and if you race..dont go in overdrive..

i had a car with no o/d at about 65 or so(stock gears) the car ran about 3k rpm...in 3rd gear (d)

an for the record my o/d does work...and barks 2nd
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If yours barks second, than it probably has a shift kit or valvebody of some sort. I don't think the stock aod can bark the tires into second gear. Can it?

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Quote:
Originally Posted by 50fanatic View Post
If yours barks second, than it probably has a shift kit or valvebody of some sort. I don't think the stock aod can bark the tires into second gear. Can it?
yea i have a shift kit..the guy said he had the trans built...i dunno though..seems like it...i did have a stock aod(i think stock) that barked second a lil at 5300 rpm
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Quote:
Originally Posted by EagleAutosports View Post
But it's not a good idea to simply drive in 3rd, you need to have the trans checked.
If you have a problem with overdrive, it is most definately ok to leave it in D instead of OD. The D postion is the same as OD just without commanding 4th gear. It would be better to leave it in third until you can get it repaired, other wise if its slipping, you can over speed your foward drum which will result in the intermediate snap ring to come undone which means a failed intermediate clutch and intermediate one way explosion. Lots of metal in the pan and more damage than expected. It is always better to drive with gears holding than without.

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When arlo speaks about AOD's, everyone should listen. If an AOD barks, good bet its been modified a bit.

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