AOD slipping in OD
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Joined: Jun 2002
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AOD slipping in OD
I've got an 88 Bronco, 302, AOD, currently 260,000 miles original. My AOD has begun to slip slightly in OD, no problems in the other gears. I believe that it is the lockup clutch that would be slipping. Is the lockup clutch for the OD inside the torque converter? If so then if I replace the torque converter will it solve the slipping problem? Anyone recommend a specific torque converter other than stock? Thanks.
Senior User
Joined: Sep 2002
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From: kansas
AOD slipping in OD
I believe the AOD does not use a lock up device of any kind. What it does have is two input shafts. One inside the other. The first acts like normal and is hooked up just like most any other trans. The second fits a set of splines that are hooked directly to the outside portion of the torque converter. Effectively bypassing any slippage at all. First and second use the torque converter as normal. Third and OD bypass it entirely.
Sorry, but I think you need a new tranny to fix the problem.
Sorry, but I think you need a new tranny to fix the problem.
Senior User
Joined: Apr 2000
Posts: 188
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From: Latrobe USA
AOD slipping in OD
the AOD uses a band to engage the overdrive and is probably worn out.
That's pretty common from what I've been reading.
You need to disassemble the tranny to get to it.
A basic rebuild kit for an AOD is about $80. It is not very hard, I just did my first tranny, an AOD also, I bought a Haynes tranny manual for $15 and it has step by step instruction with pictures.
That's pretty common from what I've been reading.
You need to disassemble the tranny to get to it.
A basic rebuild kit for an AOD is about $80. It is not very hard, I just did my first tranny, an AOD also, I bought a Haynes tranny manual for $15 and it has step by step instruction with pictures.
4wd Low
Joined: Jan 2003
Posts: 11
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From: Smithfield, VA
AOD slipping in OD
No need for a new transmission -- just have to replace that band. I'd wager on it being the band, too, as it's a pretty wimpy-looking piece of equipment to start with. 
My roommate just tore one up in his Crown Vic a couple of months ago -- the grommet attaching the TV cable snapped, and it tried to drive around in OD. This particular roommate isn't auto-savvy, so he just gave it more gas. Once you get a look at the guts of this tranny, you'll understand why that fried the OD band in a hurry. Took 50% of the friction material off and left a mostly bare steel band.
If you want to do the seals and frictions while you're in there (which we elected to do -- no point taking it apart and not doing a full rebuild), make sure you buy or borrow a set of seal installers. You can't reassemble the clutch pistons without 'em.
Chuck
My roommate just tore one up in his Crown Vic a couple of months ago -- the grommet attaching the TV cable snapped, and it tried to drive around in OD. This particular roommate isn't auto-savvy, so he just gave it more gas. Once you get a look at the guts of this tranny, you'll understand why that fried the OD band in a hurry. Took 50% of the friction material off and left a mostly bare steel band.If you want to do the seals and frictions while you're in there (which we elected to do -- no point taking it apart and not doing a full rebuild), make sure you buy or borrow a set of seal installers. You can't reassemble the clutch pistons without 'em.
Chuck
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Joined: Apr 2002
Posts: 541
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From: Victoria, Texas
AOD slipping in OD
[updated:LAST EDITED ON 01-13-03 AT 09:19 PM (EST)]You'll need some home-made tools to compress spring loaded clutch packs and to check for tolerances again when reassembling. Get some all-thread, flatbar, and larger size pvc pipe. Definitely snap ring plyers and a clean place to work. I can take my trans out in 3 hours and put it back in 3 more. But I spent a whole day rebuilding. Went slow to make sure everything was right.
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