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Author
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Topic: AOD Tranny
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bluemustangII
Journeyman Posts: 4
From: Sask, Canada
Registered: Mar 2001
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posted 03-20-2001 04:18 AM
   
Hello, I'm just posting for a friend here. He has a mint 1976 Mustang II that his mother bought in 1977. He just finished a body restoration on it, it looks great. The problem is is that its a pig on gas! It has the 302 auto in it. It is revving at 3,000 RPM at 60 MPH. Is it hard to install an overdrive tranny in here to drop the RPM's around 2000 or so? by the way, then engine is completely untouched, and the car is showing only 66,000 miles. What would be the best way to get more economy out of this car? Also, how many horspower would this stock 302 2 barrell single exhaust be putting out?
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a351must2
Gearhead Posts: 320
From: Snohomish, WA, USA
Registered: Jun 99
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posted 03-20-2001 01:52 PM
bone stock with 3.00 gears, it should be getting about 12mpg city 18mpg highway...or somewhere close to that.Only 139hp and around 260ft/lb stock, but a little over 200hp with a 4bbl, headers, and dual exhaust. I really wouldn't expect more than a few MPG improvement with an AOD, and those few MPG would only occur while driving the freeway at a constant speed. Average MPG will probably not even change noticeably. I converted my Mach 1 from a 4 speed to a 5 speed and didn't notice any change in gas mileage. (~16mpg) [This message has been edited by a351must2 (edited 03-20-2001).]
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bluemustangII
Journeyman Posts: 4
From: Sask, Canada
Registered: Mar 2001
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posted 03-20-2001 02:49 PM
Is that what gear ratio you think it has? Its turning 3,000 at 60. Thanks a lot for the horsepower figures.
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a351must2
Gearhead Posts: 320
From: Snohomish, WA, USA
Registered: Jun 99
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posted 03-20-2001 10:20 PM
3000 at 60 sounds closer to 3.55 gears...maybe 3.40
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 03-21-2001 11:12 AM
Welcome to M&M Blue  . An AOD would not fit into a Mustang II without serious modifications. It is a very tight transmission tunnel. 3000 RPM at 60 MPH depending on the tires would be a 3.55 to 3.80 rear axle ratio as the others have mentioned. I would also check on the cars state of tune.  ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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bluemustangII
Journeyman Posts: 4
From: Sask, Canada
Registered: Mar 2001
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posted 03-21-2001 11:15 AM
Hey, car is tuned to perfection if I do say so myself Thats what it was revving at with the little old 13's, I haven't changed anything though but I installed 215/60 R14's on it. What else could I do to get a little bit better fuel mileage out of this car? I know the tranny tunnell is very tight!
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Maxwell_fax
Gearhead Posts: 221
From: Port Royal, PA, USA
Registered: Nov 2000
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posted 03-21-2001 12:49 PM
When doing the AOD swap, make sure you have the right shifter. Otherwise when you use your remote starter you may launch it through a garage door into a Gran Torino...
There is a magic spot there that the neutral saftey switch is closed (Yes I rechecked the wiring), but it engages into reverse..Of course I don't know this for a fact, but it is possible.. I got an average of about 25 mpg outta my II with the 289 EFI an AOD and 3.55 gears on P205/60R13's.. But I do mostly highway driving...
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SteveLaRiviere
Administrator Posts: 33371
From: Saco, Maine
Registered: May 99
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posted 03-21-2001 01:21 PM
Your 215/60/14 tires work out to 24.1 diameter, so using a rpm calculator I come up with 3006 rpms with 3.50 gears.With a AOD, the rpms would be 2049 at the same speed. That would be a significant improvement in your mpg, I would think. ------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Keep your driveway all Ford!"
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bluemustangII
Journeyman Posts: 4
From: Sask, Canada
Registered: Mar 2001
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posted 03-21-2001 01:33 PM
That woudl probably make a huge difference, because when you think about it, its a small car, and a 302 is a small motor, so its just the RPM's that are killing his mileagethanks a lot.
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SteveLaRiviere
Administrator Posts: 33371
From: Saco, Maine
Registered: May 99
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posted 03-22-2001 09:37 AM
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'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Keep your driveway all Ford!"
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AintNoPinto
Journeyman Posts: 10
From: IN, USA
Registered: Nov 2002
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posted 11-29-2002 01:02 PM
i just put an aod in mine.. was a tight fit. and have a 347 stroker too. i havent driven it yet i am still putting the crossmembers back in HAHAHAHA. should tell you what a fun swap it was... there is a written aod swap either on mustangii.org or mustangii.net in the tech section. will tell you all you need to know
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