FE auto tranny options
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Joined: Feb 2011
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FE auto tranny options
I'm running a fairly stout 390 (roughly 430 hp) with a C6 behind it and a jag independant rear end (dana 44) with 2.88 ratio. it has more than enough power but at highway speed (75-80) it turns 2700-3000 rpm. I have looked at the add on over drives but they run about $2800. im wanting to drop my rear ratio to aroun 3.30 or 3.55 but dont want to do it without O.D. So my question is, without going with a manual, are there any O.D. auto tranny options out there. thanks in advance.
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Joined: Jan 2011
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From: Medicine Hat, AB, Canada
i'm sure you could find an AOD for it thats built up to take that power, but but that again won't be cheap what so ever. it would be cheaper i'm sure to put in a 4 speed but there really aren't much for options for FE's
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fabricating an adapter plate to bolt an fe to an aod is no problem but what about torque converter and flex plate. i assume redrill the fe flex plate for an aod conveter but what about the depth of the bell housing. are they close enough that an adapter cut from 3/16 or 1/4 inch plate will allow proper tollerances.
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
Short answer no. No direct bolt up bell for OD auto.
Something is not matched up in your setup. My 66 C6 with 3.00 rears is 82 mph at 3000 rpms.
With 2.88 you should be running faster than you posted. Going to 3.50 ratio will make your engine turn more.
With gas going up like it is, do you want it to use more??
John
Something is not matched up in your setup. My 66 C6 with 3.00 rears is 82 mph at 3000 rpms.
With 2.88 you should be running faster than you posted. Going to 3.50 ratio will make your engine turn more.
With gas going up like it is, do you want it to use more??
John
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Short answer no. No direct bolt up bell for OD auto.
Something is not matched up in your setup. My 66 C6 with 3.00 rears is 82 mph at 3000 rpms.
With 2.88 you should be running faster than you posted. Going to 3.50 ratio will make your engine turn more.
With gas going up like it is, do you want it to use more??
John
Something is not matched up in your setup. My 66 C6 with 3.00 rears is 82 mph at 3000 rpms.
With 2.88 you should be running faster than you posted. Going to 3.50 ratio will make your engine turn more.
With gas going up like it is, do you want it to use more??
John
At 3000 rpms im running 80. The way i have my truck set up, it sits so low that I cant run any taller tire on the rear right now. (255/60R15) As for a lower rear ratio, an OD tranny with 3.55 rear would give me a final drive ratio of 2.77 and a 3.73 rear would give me a final drive ratio of 2.91.
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Joined: Nov 2007
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From: Western Washington
My 76 with a built-up 390 has a C-6 auto with the 4.10 gear ratio. At 60-MPH I'm running 2500-RPM. I've thought about some kind of OD system, but can't justify the cost vs the number of miles I drive.
OJ
OJ
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From: Charelston, Illinois
Based upon the information you supplied (27.05 inch tall tire; 255/60/15), you are currently running a 3.00 rear end gear to have 3000 RPM at 80 mph. If you had an AOD with your current rear end and tire size, you would be turning roughly 2100 rpms.
An AOD transmission might be the way to go.
Another option would be to install a 2.75 ring gear (2700 rpms @ 80) or 2.50 ring gear (2500 rpms @80).
I am not sure how your truck would respond with a 2.75 or 2.50 ring gear around town, but it would definately make life easier on the highway.
Lance
An AOD transmission might be the way to go.
Another option would be to install a 2.75 ring gear (2700 rpms @ 80) or 2.50 ring gear (2500 rpms @80).
I am not sure how your truck would respond with a 2.75 or 2.50 ring gear around town, but it would definately make life easier on the highway.
Lance
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2.88 limited slip was the standard set in the jag at the time. I have had it apart and counted the teeth. Also it is marked 2.88. And besides I built the truck myself so I know what I have. But 80/ 3000 is an approximate not an exact. But thanks for everyones input.
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2.88s and 27 inch tires = 2867 at 80mph. Add a little TC slip and 3000 is about right.
AOD adaptor here, along with a good list of parts if you have the equipment to DIY:
AOD Transmission from PATC, AOD Transmissions
--just over halfway down the page, after all the parts and mods you need to make an AOD live with high horsepower.
Look for a used Gear Vendor OD. Some have gotten them off old motor homes etc at the scrappy. You might get lucky--.
IMO, I'd rather have the C6 and GVOD with your set up.
Cost wise, keep in mind the AOD needs attention for this level of power, and you can easily spend $2000+ for a built one.
AOD adaptor here, along with a good list of parts if you have the equipment to DIY:
AOD Transmission from PATC, AOD Transmissions
--just over halfway down the page, after all the parts and mods you need to make an AOD live with high horsepower.
Look for a used Gear Vendor OD. Some have gotten them off old motor homes etc at the scrappy. You might get lucky--.
IMO, I'd rather have the C6 and GVOD with your set up.
Cost wise, keep in mind the AOD needs attention for this level of power, and you can easily spend $2000+ for a built one.
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Thank you. Much appreciated. I have been thinking about the gvod for some time now, in fact their site is where I looked up the ratio chart for the OD. I really don't plan on doing A LOT of highway driving but I can hear the traffic on I-77 when it rains so it happens. I do however want a lower gear and don't want to do it without OD. I also want to keep my auto, preferably my new c6. It amazes me how many people say" put a stick shift in it, you will go faster". WRONG ANSWER, you mean slower. But I digress, thanks for the info and I will be checking out the motorhomes for my prize.
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Joined: Apr 2007
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From: Charelston, Illinois
I am in the same boat you are in. I have a 1955 F100 with a 390 (Edelbrock heads, adjustable rockers, etc...) and am running a 3.25 9" rear end with a C6 transmission. If I get about 75 mph, I feel as if the vehicle should shift into overdrive, but I am out of gears. I believe this is so because I have always owned a vehicle with overdrive.
My plan this summer is to drive with a vacuum gauge to see what RPMs my engine likes the most (a guy on the fordfe.com stated that FE engines are most efficient between 2100 and 2400 rpms??). Once I get that data, I can better determine my options.
Keep us posted on what you end of doing.
Lance
My plan this summer is to drive with a vacuum gauge to see what RPMs my engine likes the most (a guy on the fordfe.com stated that FE engines are most efficient between 2100 and 2400 rpms??). Once I get that data, I can better determine my options.
Keep us posted on what you end of doing.
Lance
Mountain Pass
Joined: Jul 2024
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From: Saskatoon
my 76F150 runs way too many Rpms on highway too.
if an OD auto isnt an easy option , is there 5 spd manual with OD that will bolt up to the 360/390 FE engines?
besides clutch assembly will a diff driveshaft or anything else be needed to manual swap?
if an OD auto isnt an easy option , is there 5 spd manual with OD that will bolt up to the 360/390 FE engines?
besides clutch assembly will a diff driveshaft or anything else be needed to manual swap?
Cargo Master
Joined: Dec 2015
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From: Harned, Ky
I’m probably going to get blasted here but if I wanted a OD automatic behind a FE making decent power I’d get a FE to GM adapter along with a stand alone controller and throw in a 4L80E
Good amount of support and adapters for that, IMO 4L60E is to weak, we broke 3 behind a 5.3 LS in a Z71 making 365 hp at the wheels
Good amount of support and adapters for that, IMO 4L60E is to weak, we broke 3 behind a 5.3 LS in a Z71 making 365 hp at the wheels
Cargo Master
Joined: Jan 2016
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Also, you landed on a relatively old thread. I believe there are a few auto options today...6R80 being one of them.
Regardless of tranny choice, you'll most likely need a custom length driveshaft.
https://transmissionadapters.com/products/fo1000203-ford-fe-410-428-to-ford-aod?srsltid=AfmBOoovMmMHbKdkSrBlnZcZSP0uz8RHcddE9m Bfb0TvGT9767blAoP5