Any AOD pros here?
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Tuned
Joined: Dec 2004
Posts: 340
Likes: 8
From: Rock Hill, SC
Any AOD pros here?
I have an AOD transmission that was built by a local shop now out of business. They never got it to shift into overdrive correctly. It has a very long laggy shift. My father bought a rebuilt AOD transmission online and it wouldn't shift so we took the control valve from the botched AOD and installed it in the online trans. It now works fine, but we realized during the swap that the old AOD has an accumulator in the case that the online trans doesn't. I am wondering if there were two different valves. One with the accumulator in the valve and the other with no accumulator for the one that has it in the trans case. If so maybe the old ones problem was having two accumulators to fill up for the Overdrive shift?
Any ideas? If I can fix the old one I want to replace my manual 4-speed with it.
Any ideas? If I can fix the old one I want to replace my manual 4-speed with it.
Last edited by Red69; Apr 30, 2009 at 07:28 PM. Reason: left the F out of shift ****
Senior User
Joined: Oct 2007
Posts: 233
Likes: 0
Aod
I have an AOD transmission that was built by a local shop now out of business. They never got it to shift into overdrive correctly. It has a very long laggy shift. My father bought a rebuilt AOD transmission online and it wouldn't shift so we took the control valve from the botched AOD and installed it in the online trans. It now works fine, but we realized during the swap that the old AOD has an accumulator in the case that the online trans doesn't. I am wondering if there were two different valves. One with the accumulator in the valve and the other with no accumulator for the one that has it in the trans case. If so maybe the old ones problem was having two accumulators to fill up for the Overdrive shift?
Any ideas? If I can fix the old one I want to replace my manual 4-speed with it.
Any ideas? If I can fix the old one I want to replace my manual 4-speed with it.
Not a pro ,but I am rebuiling mine
Mine is a 85 aod and Im putting a 90 back in that Im rebuilding what your looking at is the 3-4 accumulator piston looking down on tranny its just up from the shifter and they did a way with it in 1988 , (go look in my profile and look under tranny ablums there is a photo of where it went)
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,569
Likes: 62
From: North Georgia
From what I remember is you can put a 89 and later VB on a early case but you cant put a pre 89 VB on a late case.
When they deleted the accumulator in 89 they removed the hole in the separator plate on the VB that feeds oil to that accumulator. If you use a VB that has a hole (pre 89) on a late case with no accumulator, the 4th gear oil will dump back into the pan. You could just put the accumulator in the late case and things should be fine, I have never done that.
When they deleted the accumulator in 89 they removed the hole in the separator plate on the VB that feeds oil to that accumulator. If you use a VB that has a hole (pre 89) on a late case with no accumulator, the 4th gear oil will dump back into the pan. You could just put the accumulator in the late case and things should be fine, I have never done that.
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Tuned
Joined: Dec 2004
Posts: 340
Likes: 8
From: Rock Hill, SC
Just in case anyone else has this problem I found out you can use the later valve on the earlier AOD, but you have to use the plate from the later valve so the accumulator passage is blocked off. If you use the earlier plate on the later valve you get a huge pressure loss on the 3-4 shift.
Elder User
Joined: Nov 2008
Posts: 639
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From: houston
I rebuilt my 1st transmission, an AOD by using an instructional video that I got from JC Whitney. I put the remote to the TV/DVD/VCR in a ziplock bag to keep it clean and followed along,pausing and rewinding as needed.While I was at it I installed a TCI Pro-Super kit that includes modifications to the valve body for firmer shifts.
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