E4od to c6 conversion
Thread Starter
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Trailering
Joined: Oct 2025
Posts: 23
Likes: 2
the pan and gasket are original to the transmission. i contacted the pervious owners and asked if the trans had ever been serviced. ( they bought it from a ford employee who bought it new) they never serviced it and the recorded book they have from the original owner never serviced the trans. As i stated the fuild was black burnt and lots of material on the magnet in the pan. fluid and anti slip did nothing. yes I did drain the converter. so as much of the bad fluid came out as possible.
Fleet Mechanic
Joined: Nov 2022
Posts: 1,697
Likes: 416
the pan and gasket are original to the transmission. i contacted the pervious owners and asked if the trans had ever been serviced. ( they bought it from a ford employee who bought it new) they never serviced it and the recorded book they have from the original owner never serviced the trans. As i stated the fuild was black burnt and lots of material on the magnet in the pan. fluid and anti slip did nothing. yes I did drain the converter. so as much of the bad fluid came out as possible.
I actually swapped the fluid twice because I used a 2wd filter on it, it's a 4x4. It would drive a short distance, then stall and wouldn't restart until it sat for a bit.
Thread Starter
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Trailering
Joined: Oct 2025
Posts: 23
Likes: 2
I had a C6, with a shop towel stuffed in the transmission filter. I swapped the fluid, and (as far as I know now, sold) it still drives.
I actually swapped the fluid twice because I used a 2wd filter on it, it's a 4x4. It would drive a short distance, then stall and wouldn't restart until it sat for a bit.
I actually swapped the fluid twice because I used a 2wd filter on it, it's a 4x4. It would drive a short distance, then stall and wouldn't restart until it sat for a bit.
Cross-Country
Joined: May 2024
Posts: 50
Likes: 7
Proving yourself to people who aren't contributing anything valuable to your cause is a fool's errand. Just get an E4OD off of car-part.com, slam it in and call it good. Or buy a "for sale" sign for the thing. No shame in that.
Logistics Pro
Joined: Aug 2014
Posts: 3,570
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I think at this point I'm set on making this 6c work. partly because i have something to prove to my self and co workers as I'm not a mechanic anymore but i work at a CaseIH dealership and they all have giving me grief over this ordeal but i want to prove to myself that i still have what it takes to do this stuff at home plus its a challenge.
Otherwise, you will be custom fabricating a lot, or spending countless hours and dollars searching for the right parts that probably won't work.
Not sure how much a custom drive shaft is these days. I got lazy with my old truck spent $1000 on a custom trans cross-member and a *custom drive shaft(chevy camero driveshaft was the correct length).
Your co-workers are trying to save you grief, just like most of the replies are here.
You can do you, and you can do simple, or you can do complicated. You also can take advice of others or not. Let us know how it goes.
Lead Driver
Joined: Sep 2002
Posts: 9,555
Likes: 2,035
From: North Texas
Driveshaft labor is not inexpensive anymore, that will probably run near the value of said truck of the OP is saying it is this poor of condition.
E4OD it or part it is my opinion. Someone will buy the engine and potentially body parts if not clapped.
E4OD it or part it is my opinion. Someone will buy the engine and potentially body parts if not clapped.
Lead Driver
Joined: Jun 2021
Posts: 5,221
Likes: 805
The Shifter mechanism in the cluster for the indicator, the driveshaft as mentioned, the computer, and the crossmember location and or mount , and various inter-related things all have to be done (like harness work to get the P/N switch and functionality are all relevant here.
In my opinion, without having the parts off a matching wheel base truck to directly swap 1:1 , i would seek to repair or replace the e4od. Just my opinion. If you had a freshly rebuilt C6, that would be a good trade or downpayment for a E4OD in used shape id think.
In my opinion, without having the parts off a matching wheel base truck to directly swap 1:1 , i would seek to repair or replace the e4od. Just my opinion. If you had a freshly rebuilt C6, that would be a good trade or downpayment for a E4OD in used shape id think.
FTE Chapter Leader
Joined: May 2006
Posts: 12,343
Likes: 1,318
From: Central Mississippi
Just an observation here.
When I pulled my E4 first time the crossmember was stamped C6/E4OD as well as the flexplate. (must be 28 oz imbalance)
I'm pretty sure the frame was drilled for a C6 location using that cross member.
73 was the last time a C6 was in a Mustang with a small block bellhousing.
If you post up a pic of the biggest casting number, it'll probably tell us where it originated.
And just to be honest about stuff the VAST majority of E4 issues are electrical or wiring or computer.
When I pulled my E4 first time the crossmember was stamped C6/E4OD as well as the flexplate. (must be 28 oz imbalance)
I'm pretty sure the frame was drilled for a C6 location using that cross member.
73 was the last time a C6 was in a Mustang with a small block bellhousing.
If you post up a pic of the biggest casting number, it'll probably tell us where it originated.
And just to be honest about stuff the VAST majority of E4 issues are electrical or wiring or computer.
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Thread Starter
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Trailering
Joined: Oct 2025
Posts: 23
Likes: 2
I want to thank everyone who posted and gave me the information and insights. i have decided to to rebuild my E4od/ just replace it with one I find locally. has anyone rebuild one before? on the difficulty scale were does it fall for someone who has never rebuild a trans? i do have someone picking up the C6 i bought tonight so I'm not loosing money thankfully. I can find good 4x4 transmissions all over my area. could i just swap output shaft and be ok or should i keep searching for a 2wd and avoid the hassle?
Logistics Pro
Joined: Aug 2014
Posts: 3,570
Likes: 854
I want to thank everyone who posted and gave me the information and insights. i have decided to to rebuild my E4od/ just replace it with one I find locally. has anyone rebuild one before? on the difficulty scale were does it fall for someone who has never rebuild a trans? i do have someone picking up the C6 i bought tonight so I'm not loosing money thankfully. I can find good 4x4 transmissions all over my area. could i just swap output shaft and be ok or should i keep searching for a 2wd and avoid the hassle?
The hardest part is sourcing custom tools. I made mine.
If you get a 4x4 trans, you have to take it 100% apart to change tail shaft and housing.
I have only ever rebuilt one trans in my life, a few years ago, still going strong with over 50,000km.
Here is my E4OD rebuild thread: https://www.ford-trucks.com/forums/1...now-apart.html
Details start here: https://www.ford-trucks.com/forums/1...l#post18550983
I think it is well documented, could be summarized. Have a look and you decide.
Last edited by wwhite; Oct 24, 2025 at 03:41 PM.
Super Moderator
Joined: Apr 2004
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It all loads from the front end.
A brief comment from a former Ford transmission engineer who worked on the E4OD:
https://www.ford-trucks.com/forums/6...ml#post5103627
A brief comment from a former Ford transmission engineer who worked on the E4OD:
https://www.ford-trucks.com/forums/6...ml#post5103627
Thread Starter
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Trailering
Joined: Oct 2025
Posts: 23
Likes: 2
Ya i think ill just keep me search for a replacement trans a local shop quoted me 2 grand to rebuild. right now the truck is just not worth that in the condition its in. rust belt may claim another old truck.
Logistics Pro
Joined: Aug 2014
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