Overdrive question
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Fleet Mechanic
Joined: Jan 2005
Posts: 1,344
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Overdrive question
I'm posting this for a friend. I told him about this site and he is interested in joining. This is his question:
I have a 1992 ford aerostar extended van with
270,000 miles. My transmission will not shift into
overdreive but the other three gears shift normally.
I am thinking that it is my overdrive servo, Is
there any special tools required to change out the
overdrive servo and is there anything special that I
should look for.
I have a 1992 ford aerostar extended van with
270,000 miles. My transmission will not shift into
overdreive but the other three gears shift normally.
I am thinking that it is my overdrive servo, Is
there any special tools required to change out the
overdrive servo and is there anything special that I
should look for.
Postmaster
Joined: Sep 2003
Posts: 4,452
Likes: 1
From: Southern California
After 270,000 miles, the clutch might be suspect. As for the overdrive servo, it's on the side of the tranny and there should be no problem accessing it. Nor does it require any special tools.
Posting Guru
Joined: Jun 1999
Posts: 1,642
Likes: 6
From: Northern California
Change the ATF and filter in the Aerostar. When the atf fluid gets worn out, with the additive package being depleted, the OD shift becomes lazy or non-existent. BarryFS makes a good point too, if it shifts okay when warm, but not cold. All I am saying, is many times, a ATF and filter change does wonders for a transmission that has been neglected. It's much cheaper for a fluid (use a quality brand name ATF too. I have had excellent results with Chevron's ATF and relaiability in my '87 A4LD transmission) and filter change, before transmission work / rebuilt must be performed. Good luck...ED
PS Always lubricate the trans linkage when you are under your Aerostar for an oil change, etc. Nothing is worse, than on a cold, damp, rainy winter night. You come out on a friday night, after enjoying a delicious dinner with your spouse...girlfriend, etc. Start your ice cold 3.0 V6, putting the lever in "D", then "Snappppp!!" the floor mounted shifter or the newer column mounted shifter, flops around in your hand, not connected to anything...
PS Always lubricate the trans linkage when you are under your Aerostar for an oil change, etc. Nothing is worse, than on a cold, damp, rainy winter night. You come out on a friday night, after enjoying a delicious dinner with your spouse...girlfriend, etc. Start your ice cold 3.0 V6, putting the lever in "D", then "Snappppp!!" the floor mounted shifter or the newer column mounted shifter, flops around in your hand, not connected to anything...
Thread Starter
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Fleet Mechanic
Joined: Jan 2005
Posts: 1,344
Likes: 1
Thanks for the replies. I will pass them along. His transmission shifts just fine in all gears except for overdrive. This van is on a pretty good maintenance schedule. He drives it cross country several times a year.
Senior User
Joined: Sep 2004
Posts: 391
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From: brooksville, florida
barryfs, what exactly do you mean by inhibited? inihibited by what? the reason I ask is because my van does the same thing, works fine when warm but makes a horrible noise when cold when shifting to OD and takes for ever to change.
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Fleet Mechanic
Joined: Mar 2004
Posts: 1,529
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From: Kansas
Originally Posted by copper_90680
After 270,000 miles, the clutch might be suspect. As for the overdrive servo, it's on the side of the tranny and there should be no problem accessing it. Nor does it require any special tools.
I'm with Copper on this one. With that many miles, I'd bet anybody that the
trans has major internal problems. In stock form, (before a rebuild) the A4LD does not have a tough reputation anybody. Be lucky that you got as many miles as you did.
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I would pull the trans oil pan first and see how much trash is on the bottom and how much metal is stuck to the magnet on the bottom of the pan. Trans fluid is so neglected and should be changed at regular intervals. Also, never pull extreme loads with the overdrive engaged. I found out the hard way. The ld in a4ld stands for light duty. I would recomend a complete overhaul. I overhauled my a4ld and spent $400 in parts. That included the complete overhaul kit, an overdrive band, a new overdrive clutch drum, a good used overdrive servo piston, a 2nd to 3rd gear planetary assembly[good used], and a rebuilt torque converter. I also had to replace a needle thrust bearing that disintegrated, taking out the planet gear assembly and making a big mess. I did price a rebuilt a4ld at a nearby trans shop for $1,295.00 and an additional price of $250.00 for removing the old and installing the new one.
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