4l80e Tailshaft Adapter?
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
I don't know if that would be any easier than starting with a 4.5" chunk of cold rolled box steel or not. Honestly starting with the right size box tubing was pretty easy. I had to cut one edge off and then weld on some tabs. Then I welded on a shim on the top just to fill the space in the C beam. https://www.metalsdepot.com is were I got the 4.5" box steel for mine. It's a little under $70 for 2 feet of it.
I'm not saying that one you found wouldn't work. It might be easier. I'm just saying the box steel made it pretty easy.
I'm not saying that one you found wouldn't work. It might be easier. I'm just saying the box steel made it pretty easy.
Melting Slicks
Joined: Mar 2002
Posts: 2,873
Likes: 764
From: Sligo PA
Yeah, I had a hard time finding the metal locally, but I didn't try that hard. The way I figure it, it has a bunch of holes in the right places and cutting and welding is easier than drilling holes (I suck at getting stuff correct). I figured that if I was going to spend $70 and have to fab everything, this *might* get me a step ahead or two. LOL we shall see!
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
Either way you do it working with steel makes it easy. If something doesn't work just chop it off and make it work. Another thing that made my life easier was I cut the C beam shorter. I used an automatic (D36) C beam and cut around 6 inches or so off of the trans end. Then I just drilled two new holes through both the C beam and the adapter. That way I didn't have to line up anything. I just put a crappy angle gauge on it before I drilled. That way I at least kinda kept the same C beam angle as stock.
Melting Slicks
Joined: Mar 2002
Posts: 2,873
Likes: 764
From: Sligo PA
Yep! I can hot glue with the worst of us. The directions for the part I linked mentions you have to shorten up the C-Beam anyway so I knew that was baked into the cake. However, I am using the 4+3/D44 C-beam so that whole assembly might be longer than the 700R4 but be shorter than the 4+3/D44 setup. Either way, get in there and hack is the name of the game.
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
I took the easy way out and just bought John's billet adapter. It was the path of least resistance for me and since I know it works, I don't have to guess. Going to save time on fabbing that up and put it to fabbing up Alternator and Power Steering pump bracketry for the LS in the chassis.
Melting Slicks
Joined: Feb 2003
Posts: 2,642
Likes: 800
From: Saskatoon Sask.
I took the easy way out and just bought John's billet adapter. It was the path of least resistance for me and since I know it works, I don't have to guess. Going to save time on fabbing that up and put it to fabbing up Alternator and Power Steering pump bracketry for the LS in the chassis.
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
I would consider contacting the machinist I mentioned in post #4. Send him the adapter you bought and he will program it in Fusion. You would then have as many as you want to sell yourself and recoup your investment. I'm thinking his cost would be minimal as he is probably in search of new content for his channel. Yesterday's video was him moving shops. Not very "machinisty".
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Melting Slicks
Joined: Feb 2003
Posts: 2,642
Likes: 800
From: Saskatoon Sask.
Melting Slicks
Joined: Nov 2016
Posts: 2,148
Likes: 2,979
From: So Cal
2023 C4 of the Year Finalist - Unmodified
I was curious as to what the cost might be that also makes the 10L90 pointless. I found this. $7,100 + a $1,000 converter, +$900 shipping, and it does NOT include a core. Plus the adapter. Yeah, not gonna happen.
Just more Diz Dribble.
Just more Diz Dribble.
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
I was curious as to what the cost might be that also makes the 10L90 pointless. I found this. $7,100 + a $1,000 converter, +$900 shipping, and it does NOT include a core. Plus the adapter. Yeah, not gonna happen.
Just more Diz Dribble.
Just more Diz Dribble.
Emerging Vendor
Joined: Aug 2004
Posts: 406
Likes: 134
From: Summerfield, Florida
2023 C4 of the Year Finalist- Modified
4l8OE tailshaft adapter
Paul,
If your C4 was a stick shift the tailshaft adapter and your C-beam and drive shaft and yoke will bolt right in.
John
If your C4 was a stick shift the tailshaft adapter and your C-beam and drive shaft and yoke will bolt right in.
John
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
Good to know. Its an 87 with the 4+3. I know you had the ZF6, right? Hope they are both the same!
edit: I did throw a tape measure up and the lengths are within an inch. So it might work just fine. Just depends on how much engagement I can get into the 4L80e as it appears a tad bit shorter. But I could be way off.
Last edited by marshallnoise; Mar 19, 2026 at 07:30 PM.
Melting Slicks
Joined: Feb 2003
Posts: 2,642
Likes: 800
From: Saskatoon Sask.
"Would be nice if they made a 10spd auto tailshaft adapter for those doing that swap". Let's analyze that statement. First of all, I know of nobody "doing that swap". Want to know why? Because, as I stated, it won't fkn fit without massive tunnel destruction. Many times here, some have asked about the 6L80 and have been told it won't fit. The 10L90 is BIGGER than the 6L80. Secondly, the 10L90 is about seven inches longer than a 4L60 and about 200 pounds heavier. If someone is going to butcher up their C4 to fit a 10L90 in it, they probably are not going to utilize a bought tail shaft adapter, they have the skills to modify the C beam and build their own bracket. Lastly, what company in their right mind is going to put all the time and effort into R&R, Fusion time and CNC time to sell it to nobody?
Melting Slicks
Joined: Mar 2001
Posts: 2,147
Likes: 302
From: Timra, Sweden
MaxxECU put a lot of effort into controlling the ZF-8HP transmission, Gen 1 only for now. Their aproach is to flash a new firmware into the transmission controller inside the transmission. So the OEM electronics is reading all the sensors and driving the solenoids using instructions from the ECU over CAN-bus.
Some supported features:
* Clutch kick - To break traction, something used in drifting.
* Trans brake, with bump function. (Dodge transbrake function)
* Launch control - for small engines that need more RPM to build boost. Clutched are open (neutral) until they apply 100% at launch.
* Virtual clutch - Similar to clutch kick but with analog signal from clutch pedal.
* They reccomend DBW throttle to also throttle blip during shift, reducing engine tourqe during shift to reduce load on the transmission.
* Can use 8HP shifter or emulate shifter.
https://maxxecu.com/webhelp/advanced-8hp.html
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
Not sure of your thought process but pretty sure most people besides you and Dez WOULD think it's pointless. Here is Dez's post:
"Would be nice if they made a 10spd auto tailshaft adapter for those doing that swap". Let's analyze that statement. First of all, I know of nobody "doing that swap". Want to know why? Because, as I stated, it won't fkn fit without massive tunnel destruction. Many times here, some have asked about the 6L80 and have been told it won't fit. The 10L90 is BIGGER than the 6L80. Secondly, the 10L90 is about seven inches longer than a 4L60 and about 200 pounds heavier. If someone is going to butcher up their C4 to fit a 10L90 in it, they probably are not going to utilize a bought tail shaft adapter, they have the skills to modify the C beam and build their own bracket. Lastly, what company in their right mind is going to put all the time and effort into R&R, Fusion time and CNC time to sell it to nobody?
"Would be nice if they made a 10spd auto tailshaft adapter for those doing that swap". Let's analyze that statement. First of all, I know of nobody "doing that swap". Want to know why? Because, as I stated, it won't fkn fit without massive tunnel destruction. Many times here, some have asked about the 6L80 and have been told it won't fit. The 10L90 is BIGGER than the 6L80. Secondly, the 10L90 is about seven inches longer than a 4L60 and about 200 pounds heavier. If someone is going to butcher up their C4 to fit a 10L90 in it, they probably are not going to utilize a bought tail shaft adapter, they have the skills to modify the C beam and build their own bracket. Lastly, what company in their right mind is going to put all the time and effort into R&R, Fusion time and CNC time to sell it to nobody?
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
I have heard a lot of good things about those. I have a MaxxECU to control my engine and 4L80E and that works really well. A real benefit to have the same control system for both engine and transmission.
MaxxECU put a lot of effort into controlling the ZF-8HP transmission, Gen 1 only for now. Their aproach is to flash a new firmware into the transmission controller inside the transmission. So the OEM electronics is reading all the sensors and driving the solenoids using instructions from the ECU over CAN-bus.
Some supported features:
* Clutch kick - To break traction, something used in drifting.
* Trans brake, with bump function. (Dodge transbrake function)
* Launch control - for small engines that need more RPM to build boost. Clutched are open (neutral) until they apply 100% at launch.
* Virtual clutch - Similar to clutch kick but with analog signal from clutch pedal.
* They reccomend DBW throttle to also throttle blip during shift, reducing engine tourqe during shift to reduce load on the transmission.
* Can use 8HP shifter or emulate shifter.
https://maxxecu.com/webhelp/advanced-8hp.html
https://www.youtube.com/watch?v=lmDAOdIoKwI&t=1s
MaxxECU put a lot of effort into controlling the ZF-8HP transmission, Gen 1 only for now. Their aproach is to flash a new firmware into the transmission controller inside the transmission. So the OEM electronics is reading all the sensors and driving the solenoids using instructions from the ECU over CAN-bus.
Some supported features:
* Clutch kick - To break traction, something used in drifting.
* Trans brake, with bump function. (Dodge transbrake function)
* Launch control - for small engines that need more RPM to build boost. Clutched are open (neutral) until they apply 100% at launch.
* Virtual clutch - Similar to clutch kick but with analog signal from clutch pedal.
* They reccomend DBW throttle to also throttle blip during shift, reducing engine tourqe during shift to reduce load on the transmission.
* Can use 8HP shifter or emulate shifter.
https://maxxecu.com/webhelp/advanced-8hp.html
https://www.youtube.com/watch?v=lmDAOdIoKwI&t=1s
Melting Slicks
Joined: Feb 2003
Posts: 2,642
Likes: 800
From: Saskatoon Sask.
I only am interested in correct information. Your feelings are a non concern to me. I didn't make the nonsense statement. I simply pointed out WHY it was nonsense. You rebutted it with nonsense. If you didn't want to be corrected, then you should not have attacked my statement of fact. When someone tries to BS me with incorrect info, then I respond. If you can't take someone correcting you then that is a "you thing".
Pro
Joined: Sep 2024
Posts: 526
Likes: 110
I only am interested in correct information. Your feelings are a non concern to me. I didn't make the nonsense statement. I simply pointed out WHY it was nonsense. You rebutted it with nonsense. If you didn't want to be corrected, then you should not have attacked my statement of fact. When someone tries to BS me with incorrect info, then I respond. If you can't take someone correcting you then that is a "you thing".
There is a book you should read. It's called "Winning Friends and Influencing People."
Be less of a dick and more of a reasonable human being. You didn't rebutt ****, you were a dick. Nothing more and nothing less. You won the internet!!! 😂