c4 transmission problem?
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1987 transmission problem? Is it called AOD?
I have an 87 full size bronco. It had been running great but all of a sudden I can't get it to go over 10 mph. I changed out the transmission filter and gasket, but that didn't help. There is a pipe coming down on the driver's side front of the tranny. It doesn't connect to anything, just open. Should it have a vacumn line? any suggestions to check would be great. Thanks
Last edited by amboyalan; Feb 23, 2008 at 07:22 PM. Reason: wrong type of tranny stated
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From: sunny fla sometimes windy
What motor do you have? Have you messed with the tv cable that connects to the
throttle arm? Did you just wake up one morning and it start hapening or did you drive
through some water etc. When was the last time the fluid was changed? what size tires do you have? Heres some good aod info which is what you probably have.
http://www.lincolnsonline.com/tech/00080.html A way to tell the difference is by the
pans shape. http://www.broncodata.com/reference/trannya.htm
throttle arm? Did you just wake up one morning and it start hapening or did you drive
through some water etc. When was the last time the fluid was changed? what size tires do you have? Heres some good aod info which is what you probably have.
http://www.lincolnsonline.com/tech/00080.html A way to tell the difference is by the
pans shape. http://www.broncodata.com/reference/trannya.htm
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I was driving going to my folks house. There was snow on the sides of the road, but no puddles to drive through. I was going up the last hill before there house and my problem started. I started to think I wouldn't make it up to the top. We did chnge the filter and pan gasket since then, but that didn't help. Sounds like some air hissing, but I can't find any info on vacumn lines.
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From: Milan, TN
What size engine? 4.9/5.0 or 5.8? If it's 4.9/5.0, welcome to the wonderful world of the AOD. Cheapest solution is a C6. Usually available at any decent scrapyard. HARD to break a C6. It's the tranny equivalent of a 9" rear end.
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From: Milan, TN
I know the C6 will bolt up with almost no problems (you may need a driveshaft...not quite sure, but even if you do, definately worth it...). The AOD is a POS. It won't hold up to anything you want to do outside of GENTLE driving. Vacuum problems or not, you'd be better off with a C6.
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From: Simi Valley, CA
Originally Posted by amboyalan
I have an 87 full size bronco. It had been running great but all of a sudden I can't get it to go over 10 mph. I changed out the transmission filter and gasket, but that didn't help. There is a pipe coming down on the driver's side front of the tranny. It doesn't connect to anything, just open. Should it have a vacumn line? any suggestions to check would be great. Thanks
An AOD isn't a C4..two completely different transmissions.
AOD: Rule of thumb > > STAY OUT of overdrive in heavy stop and go traffic. The constant searching up/down between Drive and Overdrive fries the transmission. It doesn't take too long for this to happen either. Add the largest external trans cooler you can find...that will help...a little.
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From: Milan, TN
Absolutely true... but the problems he describes sound waaaaaaaaaaaay to familiar to an AOD rather than a C6...Plus you know a lot more about the numbers/equipment than I do, but the AOD became all but standard on the 302 in 84/85, right?
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From: Simi Valley, CA
Originally Posted by 83bigbroncoguy
Absolutely true... but the problems he describes sound waaaaaaaaaaaay to familiar to an AOD rather than a C6...Plus you know a lot more about the numbers/equipment than I do, but the AOD became all but standard on the 302 in 84/85, right?
First use of an AOD in Bronco's: 1985, and only with the 302.
1980/84 302 Bronco's used C6's.
351W used C6's.
The 1981 and later F150 302's came either way.
First AOD: 1980 Ford LTD & T-Bird/Merc Grand Marquis/Lincoln Town Car/Mark VI.
AOD = total POS
A fellow partsman and I at Crenshaw Motors (in Los Angeles) in the early 1980's figured out a "kit" to convert Lincoln Town Cars and limo's from AOD's to C6's.
Trying to figure out what would work was a royal PITA!
We had one thing going for us, Crenshaw Motors was the third largest Ford dealer on the planet inre to parts inventory. Only Rick Warner Ford in Utah, and a dealer east of the Mississippi carried more parts inventory than we did.
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