Question on AOD for 8BA
Fleet Owner
Joined: Jul 2004
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From: NM
Honestly, I'd put a C4 and a 9" or 8.8 with 3.25 gears behind it and call it a day. The $$ payback on having OD with gas around $2/gal is decades in the future. With the hills around you you're likely to be in OD on the downhill side only. Add in famous AOD problems, who needs it? You don't usually have to cut the crossmember to fit a C4, either.
Logistics Pro
Joined: Nov 2011
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From: Northville, MI
Honestly, I'd put a C4 and a 9" or 8.8 with 3.25 gears behind it and call it a day. The $$ payback on having OD with gas around $2/gal is decades in the future. With the hills around you you're likely to be in OD on the downhill side only. Add in famous AOD problems, who needs it? You don't usually have to cut the crossmember to fit a C4, either.
But I picked the 4R70W because the .70:1 overdrive gear gives you 30% better cruising speed and less engine noise. Reliability is better than the AOD.First gear is lower on the C4 at 2.41 vs the 4R70W at 2.84:1 but the torque converter is most effective at compensating in low gear.
With the wide opening in the F2 crossmember vs F1 there should be less mod needed.
Senior User
Joined: Feb 2015
Posts: 387
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From: Arizona
parasitic loss is certainly something to think about with the AOD/4R70. How much HP does a mildly built/refreshed Flathead put out? Between an AOD and 4R though the 4R is a better transmission in every way
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FTE Chapter Leader
Joined: Dec 2001
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From: Crossville, Tn
Well I am staying away from the 4R70 because it basically requires installing a computer (PCM) or aftermarket unit.
Senior User
Joined: Feb 2015
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From: Arizona
That's what makes the 4R that much better. You control everything the Trans does to suit your driving style. Plus you can find a low mile 4R for 2-300 bucks. No such thing as a low mile aod anymore so then you're talking rebuild $$
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FTE Chapter Leader
Joined: Dec 2001
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From: Crossville, Tn
Do you know if anyone makes an adapter to mount that transmission on a flathead?
Senior User
Joined: Feb 2015
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From: Arizona
It would be the same adapter to use with the AOD.
I checked car-part and found quite a few 4Rs for $2-300 with 50-80k miles in Tennessee. The V6 windsor pattern 4R70s seem to go for way cheaper than the modular 4r. The V6's just didn't tear them up so nobody needs em
I checked car-part and found quite a few 4Rs for $2-300 with 50-80k miles in Tennessee. The V6 windsor pattern 4R70s seem to go for way cheaper than the modular 4r. The V6's just didn't tear them up so nobody needs em
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Logistics Pro
Joined: Nov 2011
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From: Northville, MI
Speedway has a kit listed also for flathead to AOD
Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 80
From: Northville, MI
Bob Bendtsen says that you want the non-modular 4R70W.
Logistics Pro
Joined: Nov 2011
Posts: 4,685
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From: Northville, MI
Dyno results between GM Trannys????? | The H.A.M.B.
And here is another:
Transmission specifications (including parasitic HP losses) - 460 Ford Forum
If you are worried about parasitic loss it looks like a GM Powerglide is the way to go.
Senior User
Joined: Feb 2015
Posts: 387
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From: Arizona
Yeah I know. I'm running a 4r70 behind a 302 out of an 03 mustang. The 3.8 and 4.2 V6 motors used the windsor bolt pattern
Fleet Owner
Joined: Jul 2004
Posts: 27,294
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From: NM
This is an interesting post on parasitic loss:
Dyno results between GM Trannys????? | The H.A.M.B.
And here is another:
Transmission specifications (including parasitic HP losses) - 460 Ford Forum
If you are worried about parasitic loss it looks like a GM Powerglide is the way to go.
Dyno results between GM Trannys????? | The H.A.M.B.
And here is another:
Transmission specifications (including parasitic HP losses) - 460 Ford Forum
If you are worried about parasitic loss it looks like a GM Powerglide is the way to go.
I read the Car Craft test article a long, long time ago, and it didn't strike me as either very scientific or apples-to-apples. They did some more recent tests that included comparisons with manual trannies, and the manuals weren't hugely different.
PS -- they noted in their tests that much of the losses were due to spinning the weight of the planetaries, AND that heavier planetaries are associated with the trannies that have a reputation for being reliable... choose your poison.
Logistics Pro
Joined: Nov 2011
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From: Northville, MI
Those loss numbers being in HP always bugged me. They are from a Car Craft test where they were running hard -- these numbers are the PEAK losses from some very potent cars, well over 400 HP. You don't see such big losses driving around town, or running at 25% throttle on the interstates.
I read the Car Craft test article a long, long time ago, and it didn't strike me as either very scientific or apples-to-apples. They did some more recent tests that included comparisons with manual trannies, and the manuals weren't hugely different.
PS -- they noted in their tests that much of the losses were due to spinning the weight of the planetaries, AND that heavier planetaries are associated with the trannies that have a reputation for being reliable... choose your poison.
I read the Car Craft test article a long, long time ago, and it didn't strike me as either very scientific or apples-to-apples. They did some more recent tests that included comparisons with manual trannies, and the manuals weren't hugely different.
PS -- they noted in their tests that much of the losses were due to spinning the weight of the planetaries, AND that heavier planetaries are associated with the trannies that have a reputation for being reliable... choose your poison.
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FTE Chapter Leader
Joined: Dec 2001
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From: Crossville, Tn
I'm getting mine from Bendsten's Transmission Adapters & it includes the starter.
Speedway has a kit listed also for flathead to AOD
Speedway has a kit listed also for flathead to AOD