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Old 09-09-2007, 08:07 PM   #1
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Default 6L80E Swap

Classic Restoration Enterprises is continuing work on their 1986 Pontiac Grand Prix 2+2 Cadillac 6.2L VVT/6L80 swap. They have the engine and transmission in the car. By the way, it's also running a C5 ZO6 corvette suspension. They are using 2003 Corvette Z06 wheels with oversized 315/30ZR18 tires for the rear. Just barely stick out.

This may be one of the first "working" 6L80E swaps so far.

Swap pics:

http://www.classicresto.com/mambo/content/view/96/48/
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Old 09-09-2007, 08:25 PM   #2
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Are they just using a Denali or Escalade control modules?
If they are not, then someone's done some tinkering.
If they are just using the modules from the SUV, then cool swap, but nothing standout for progress.
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Old 09-09-2007, 09:44 PM   #3
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We've had our LS2/6L80 swap on the road for about 2 months and are now selling the harness/ECM/trans systems. Just need to get the web site updated.

Click the image to open in full size.

We just shipped an L92/6L80 rework package out, as well as an LS7/6L90 setup out to California.

There seems to be a lot of interest in these!
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Old 09-10-2007, 12:50 AM   #4
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That is AWESOME. Do you have anymore details on this?

Can this be worked on Gen 3 engines? If so, I would go this route instead of building up the 4L60
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Old 09-10-2007, 12:35 PM   #5
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The electronics to make this work are heavily integrated between the transmission and the ECM. To make it work on a Gen 3 engine you would have to change the reluctor wheel over to the 58X version and go with the newer E38 ECM. Not real practical for an existing setup, but if you're starting a new project it's definitely worth giving some thought to!
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Old 09-10-2007, 12:44 PM   #6
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Awesome drivetrain... but that car is absolutely hideous!
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Old 09-10-2007, 01:40 PM   #7
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Wow, someone must really, REALLY love that GP. Slick setup in an ugly car.
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Old 09-10-2007, 06:23 PM   #8
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speartech; does this mean there is an ls2/4l80e package as well? ive been waiting patiently thanks JOHN
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Old 09-10-2007, 07:11 PM   #9
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Finally, someone with an off-the-shelf solution for the 6L80/90E trans!
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Old 09-10-2007, 07:35 PM   #10
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What are the benefits other than bragging rights in a vehicle that is not towing 10k + lbs? I suppose you could run 4.56's or higher with a double over drive.

What are the gear ratios of the 6l80?
How much biggger is than the 4l80e?

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Old 09-10-2007, 08:03 PM   #11
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Quote:
Originally Posted by ponjohn
What are the benefits other than bragging rights in a vehicle that is not towing 10k + lbs? I suppose you could run 4.56's or higher with a double over drive.

What are the gear ratios of the 6l80?
How much biggger is than the 4l80e?

John
Ditto. I would like to know the gear ratios and size difference also...

How strong are these transmission stock and are shops building them yet? Will it require a new crossmember?
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Old 09-10-2007, 08:24 PM   #12
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6L80E ratio's
First: 4.02
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth 0.67

Reverse: 3.06

Only difference I could find in the 80 and 90, as far as ratio's, is the first gear looks to be 4.03 on the 90. You would never notice that small amount.
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Old 09-10-2007, 08:48 PM   #13
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The ratios are the same between the 80 and the 90. The 90 gets beefier parts and thicker gears making it 35mm longer. The 6L80 is actually a little shorter than the 4L60E. We had to actually LENGTHEN the driveshaft for our project.

I think the big advantage with the 4.03 first gear is to use a lower numerically rear end ratio without giving up any off the line performance and still be able to cruise at a very low rpm down the highway.

I have our LS2/6L80 setup mated to a 3.73 rear end and the thing is an incredible beast off the line (as would be expected).

You could change the rear end to a 2.73 and still have almost the same first gear multiplication as 3.73's with a 4L60E. Think of how low your highway cruising rpm would be with 2.73 gears and a .67 overdrive! That's what I feel the big advantage would be (although the 6L80 with 3.73's is a lot of fun).
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Old 09-10-2007, 08:52 PM   #14
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These are from gmpowertrain.com

6L90E:

Maximum engine torque: 531 lb-ft
Maximum gearbox torque: 885 lb-ft


Click the image to open in full size.

6L80E:

Maximum engine torque: 439 lb-ft
Maximum gearbox torque: 664 lb-ft

Click the image to open in full size.
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Old 09-10-2007, 10:54 PM   #15
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Quote:
Originally Posted by john 67
speartech; does this mean there is an ls2/4l80e package as well? ive been waiting patiently thanks JOHN

Yes! LS2/LS7 with 4L80E is now available. Let me know your details and we'll get you fixed up.

Thanks.
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Old 09-11-2007, 01:21 AM   #16
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What car/truck is the 6L90 used in?
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Old 09-11-2007, 02:25 AM   #17
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GMC Yukon Denali
GMC Sierra Denali pick up
Cadillac Escalade

Pretty much anything powered by the L92
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Old 09-11-2007, 05:34 AM   #18
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It all sounds good on paper, in order to use it you'll have to have a well thought out combo. It could end up where the engine does not have enough tque to pull a 3.23 gear and OD unless your doing 180mph.

John
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Old 09-11-2007, 11:13 AM   #19
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Quote:
Originally Posted by adams2003
What car/truck is the 6L90 used in?
I think the 6L90 is only used in the HD Silverados and Sierras behind the 6.0 Gen 4 engine.

All of the Escalades and Denalis use the 6L80 with the 6.2.
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Old 09-11-2007, 02:40 PM   #20
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I have a truck with big tires and the 4L80e the first gear would be awesome and really help me as my current first is close to the new 2nd but the difference between .67 and .70 (4L60E) and my .75 (4L80) can't make that big a difference I am thinking. otherwise my friend who drives a Denali should be getting better than 12.2 mpg cause the engine itself is incredible and has gobs of low end TQ.

running some rpm calculations if my truck had 30 inch tires and it was geared at 4.56 running at 70mph the I would be running at 2861 RPMs (.75 final ratio)

with the same parameters but using the 6L80e (.67 final ratio) it is 2395 RPMs

with the same parameters but using the 4l60e (.70) the RPMs is 2502.

I guess with my own evedence the difference between the 6L80 and 4L80 is real enough but the 100 rpm difference from the 4l60 i am not sure about.

I guess I should get back to work

I also have to chime in on the ugly car thing
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Old 09-11-2007, 02:40 PM
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