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Old 05-16-2013, 03:20 PM   #1
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6L60/6L80 swap

Just picked up my new project from Grifter on this board.

Getting things lined up although I expect this to be a 2 or 3 year project start to finish.

My 89 Formula is on its way and the first thought in my mind is 6 speed...auto.

I know the 6L60 is pretty big width and height and I am wondering if anyone has ever bothered...or if its worth it.

For simplicity's sake, I will probably go 4L60 but I'd prefer the extra 2 gears if fabrication isn't over the top. I know someone stuck one in a 95 Impala SS but the trans tunnel on an F body is a bit tighter.

Looking for a reply.
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Old 05-16-2013, 03:35 PM   #2
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Re: 6L60/6L80 swap

get a 4l60 with a gear venders overdrive ITS way overkill but will give you roughly 8 gears by being able to split any gear
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Old 05-25-2013, 01:19 PM   #3
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Re: 6L60/6L80 swap

The 4L80E is a massive trans and just barely fits in the stock trans tunnel. The 6L80E is even bigger

Best chance is to cut the trans tunnel out, finalize the trans position and modify/replace the trans tunnel like older cars commonly do with swaps
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Old 05-27-2013, 02:50 PM   #4
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Re: 6L60/6L80 swap

After researching the gear splitter I think I am going to go that route. I haven't talked to the company yet but I'm a year away from digging in deep on this project. I'm researching now trying to plan everything.

Now its a matter of finding a trans fabricator in NJ who will can work with me or finding the right combination of build parts. Our sponsor makes a kick *** tranny but its a little out of what I was budgeting for a trans.
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Old 05-28-2013, 01:51 PM   #5
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Re: 6L60/6L80 swap

have you looked into TCI's 6 speed using a 4L80 housing?
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Old 05-28-2013, 02:52 PM   #6
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Re: 6L60/6L80 swap

Quote:
Originally Posted by ssgt usaf View Post
have you looked into TCI's 6 speed using a 4L80 housing?
No I haven't. However, a quick glance at TCI's website, tells me that $6630 seems a bit much when I can buy a 700r4 that can handle 700hp & a gear splitter for a total of $5000.

My preference may change once I start getting input on the engine and what I want the end result to be of this product. I'm not 100% sure of what end result I want yet, but durability is at the top of the list for starters. So the research has started and I would probably think a year of talking to people should put me right where I want to be.

I have a lot of research to do before diving in head first but the comments are appreciated.

Last edited by fozzi58; 05-28-2013 at 02:57 PM.
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Old 05-30-2013, 12:09 PM   #7
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Re: 6L60/6L80 swap

very true, and I know its pricey just seemed cool idk anyone who has one just been researching it on youtube. the 6l80 I have in my new vette is very good and my old vette was an '06 and supercharged had 561/492 to the rear, RPM built 6l80 tranny held together the whole time and I put well over 40,000 miles of hard driving through it. good luck with your project either way you decide to go.
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Old 07-06-2013, 11:43 AM   #8
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Re: 6L60/6L80 swap

I had similar thought of fitting and L76/6L80e combination from a '09 Pontiac G8 GT into my '91 Z28 convertible, but to start cutting the tunnel to fit the much larger 6L80e for the extra 2 gears was not worth the additional cash and headaches with having to modifying the center console and gear selector etc.
I ended up taking the simple route and bought a rebuild 4L60e and that works just great.
Good luck with your project.
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Old 12-14-2013, 06:50 AM   #9
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Re: 6L60/6L80 swap

I realize this is old,but I just wanted to say that I have done the swap on a 1991 RS convertible and I love it! The tunnel was raised 1.5 inches and the same amount removed from the sides of the console(under the carpet).The shifter only needed a hole drilled to bolt it to the trans. pan. Remember that you only need to shift as far as DRIVE if you do not plan on paddle shifting and only one one past that would be M for manual shifting WITH paddle shifters. With the raised tunnel I was still able to use a standard size radio but selection is limited because of the depth available. I used Spohn engine mount adapters with GEN 4 mounts. To mount the trans. I used a Spohn cross member and torqe arm for a T56 swap. A 1.25 spacer was needed to fine tune the trans position and drive line angle A 2011 camaro trans. mount was used. I would be happy to give anyone who wants to do this swap more details. I did this in a two car garage with the exception of rewelding in the tunnel, I have a friend who builds stock cars that did that part for me.
If you decide to do this I think you will love it as much as I do!

Last edited by kestell123; 12-14-2013 at 07:13 AM. Reason: To add
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Old 12-14-2013, 08:19 AM   #10
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Re: 6L60/6L80 swap

Got any pictures?
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Old 12-15-2013, 02:30 PM   #11
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Re: 6L60/6L80 swap

here'100_0788.JPG

100_0881.jpg

100_0801.JPGs pics
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Old 12-15-2013, 02:37 PM   #12
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Re: 6L60/6L80 swap

more pics

Last edited by kestell123; 12-15-2013 at 03:01 PM. Reason: pics did not load
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Old 12-15-2013, 03:15 PM   #13
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Re: 6L60/6L80 swap

I will try again
Attached Images
File Type: jpg 100_0804.JPG (906.9 KB, 58 views)
File Type: jpg 100_0884.jpg (495.9 KB, 53 views)
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Old 12-15-2013, 06:30 PM   #14
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Re: 6L60/6L80 swap

Excellent info
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Old 12-16-2013, 10:25 AM   #15
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Re: 6L60/6L80 swap

Wow, thats awesome. The pics are greatly appreciated.
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Old 12-16-2013, 03:05 PM   #16
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Re: 6L60/6L80 swap

In the photo looking through the cut-out at the trans. mount, you can see a mismatch between the cross member and the mount studs, instead of modding the cross member I had a 1.25 inch adapter/spacer made to both account for the mismatch and get the driveline angle right. the adapter mounts to the trans mount studs(I shortened them). The bottom of the adapter has threaded inserts that allow it to be bolted from below to the crossmember
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Old 12-17-2013, 01:29 PM   #17
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Re: 6L60/6L80 swap

Lets see if I got this right... You used a t56 swap torque arm and then made an adapter plate to bolt the 4l80 to the crossmember?
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Old 12-17-2013, 03:37 PM   #18
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Re: 6L60/6L80 swap

Not a 4l80 a 6l80 six speed auto
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Old 01-19-2014, 12:14 AM   #19
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Re: 6L60/6L80 swap

Hm. I see you have an LS engine. Any chance that I'd be able to pull this off with a different one, say, a 350? I don't know much about how they would line up, or whether an adapter for such a thing exists.
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Old 01-19-2014, 07:24 AM   #20
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Re: 6L60/6L80 swap

The hard part of my swap was the 6l80 trans. An ls swap into a third gen is not hard if you use a LS 4l60 trans. The stock drive shaft should even work. You could use a 4.8,5.3,5.7,6.0,or a 6.2. they all will mount the same.There is a lot of info on this site. Have fun! P.S. If you do not want to do the wiring John Spears at SPEARTECH could make a plug and play harness.

Last edited by kestell123; 01-19-2014 at 07:27 AM.
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Old 01-19-2014, 07:24 AM
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