6L80 in Monaro/GTO/VZ

[TrueBlueGTO]

Ok Mates,

I'm aware of the technical nightmares involved in the ECM/TCM issues.

But what I need to know is if the Monaro/GTO floorpan will accommodate a 6L80E transmission. Anyone?

Cheers!

[TrueBlueGTO]

TTT...anyone?

[OPTIMUS]

hard question for anyone here to answer id suggest looking into it on US websites.. however the early middle east VEs had the 4l65e so i would assume it would physically fit maybe issue with trans sump though, could easily be swapped over

[TrueBlueGTO]

No one here in the US has tackled this issues b/c GTOs are so rare. Would anyone happen to have pics of the Coupe 4 or UTE AWD transmission view underneath?

I'm thinking/hoping that the provisions of space that Hodlen would have afforded for the AWD, T-56, and 4L65 transmissions would mean a sizeable trans tunnel for the 6L80E.

[gmh308]

No one here in the US has tackled this issues b/c GTOs are so rare. Would anyone happen to have pics of the Coupe 4 or UTE AWD transmission view underneath?

I'm thinking/hoping that the provisions of space that Hodlen would have afforded for the AWD, T-56, and 4L65 transmissions would mean a sizeable trans tunnel for the 6L80E.

One check would be to measure the clearance above the rear of the trans where the extension housing meets the main trans case. And/or compare the trans tunnel profile against a G8.

Comparison here:

http://www.ls1tech.com/forums/conversions-hybrids/898899-6l80-6l90-into-68-camaro-does-go.html

Shows the 6L trans is about 20mm higher at that point from the trans centre line.

Holden designed the floorpan for the VT-VZ cars (GTO base) around 1994-96, so fair chance that 6 speed autos and AWD were not taken into account then, but it does have a tallish trans tunnel.

ECM/TCM integration probably a bigger challenge than the tunnel. :)

[Tre-Cool]

One check would be to measure the clearance above the rear of the trans where the extension housing meets the main trans case. And/or compare the trans tunnel profile against a G8.

Comparison here:

http://www.ls1tech.com/forums/conversions-hybrids/898899-6l80-6l90-into-68-camaro-does-go.html

Shows the 6L trans is about 20mm higher at that point from the trans centre line.

Holden designed the floorpan for the VT-VZ cars (GTO base) around 1994-96, so fair chance that 6 speed autos and AWD were not taken into account then, but it does have a tallish trans tunnel.

ECM/TCM integration probably a bigger challenge than the tunnel. :)
If the GTO has an E40 or E38 ECM than integration would be a whole lot easier.

I was actually thinking of putting a 6 speed auto in my vy ute, but because the software for the trans just isnt out there to do what i want it's not really feasible.

i.e It would be good if you could program the auto to just relie on just the VSS signal for shifts and TPS signal as you could then program the shifts like normal and optionally use the manual mode padle shifts.

[TrueBlueGTO]

Thanks for the help guys!:goodjob:

Took a while, but our project was finally successful. We got the truck up and running with the swap. So we know after we get the module interface into production that E40 GTOs (Monaro/Commies) will be able to plug and play a 6L80 or 6L90 easily! Hopefully we'll find a local GTO owner to help us test it by November.

We never base lined it, but using a magazine test result of a similarly equipped vehicle at 15.7 seconds and GM Engineers stating that up to a 7% acceleration gain is possible, we are hoping for a mid 14 second 1/4 for our truck....and over 20 mpg highway with the DoD/AFM.

[surfwagon]

This was question I was thinking about asking and then I came across your update today.
So have you actually fitted the 6L80 into a GTO body?
I have the HSV version 4 door over here with LS2 and E40 BCM and wondered if the swap was possible and/or worth the trouble.





__________________________________________________ _______
my ride http://www.ls1.com.au/forum/showthread.php?t=121025

[TrueBlueGTO]

We have not actually fitted one to a GTO. However, because the GTO and F-Body were being considered as future projects careful observation, fitments and measurements were made of the 4L70E in relationship to the Trailblazer tunnel.

Based on several observations I'm confident that the transmission will fit.

1) the 6L80 is shorter than the 4L70/65/60

2) the extra bulk of a 6L80 is primarily along the bottom, similar to a 4L80E that fits in GTO's

3) the 6L80 has a similar top deck profile and overall length as the T-56 due to the tailhouse extension shifter that comes on GTO's. The A4's have a sloping and narrowing top profile.

4) Holden had to give enough floorpan transmission tunnel space to accommodate the 2 pc driveshaft's suspension movement

5) once installed in the Trailblazer there was still a good inch+ plus of room all around the 6L80 transmission. Enough to throw over all the dangling wire and connectors left over from the 4L70 with no interference with the floorpan

6) I used and compared transmission length and girth reference points to the undercarriage photo of the '04 GTO exhaust that is floating around on the web.

7) I used and compared transmission lengths, girths, etc reference points in relations to the bellhousings and engines.

8) Considering the GTO/Monaro/Commie was designed to accommodate the added components of AWD and was designed in the late 90',s as our truck was, I'm sure there is more than enough room under there as engineering tolerances were not what they are now

[seedyrom]

No one here in the US has tackled this issues b/c GTOs are so rare. Would anyone happen to have pics of the Coupe 4 or UTE AWD transmission view underneath?

I'm thinking/hoping that the provisions of space that Hodlen would have afforded for the AWD, T-56, and 4L65 transmissions would mean a sizeable trans tunnel for the 6L80E.
I know not relevant any more, but it may help some ...


http://www.oz8.org/gallery/albums/Seedyrom/CrossTrac1.jpg

http://www.oz8.org/gallery/albums/Seedyrom/CrossTrac2.jpg

[TrueBlueGTO]

Thanks...actually it does help because I still plan to have one of these!! Even though I recognize that Holden never made a RHD AWD due to, what I believe was, steering column/rack interference, I can have custom linkages made to reposition things!

[surfwagon]

Here is a pic from the HSV Z brochure for the Coupe4.
http://i130.photobucket.com/albums/p266/surfwagon/DSC059471600x1200.jpg



__________________________________________________ __________
my senator http://www.ls1.com.au/forum/showthread.php?t=121025

[Blown 454 AWD]

We have not actually fitted one to a GTO. However, because the GTO and F-Body were being considered as future projects careful observation, fitments and measurements were made of the 4L70E in relationship to the Trailblazer tunnel.

Based on several observations I'm confident that the transmission will fit.

1) the 6L80 is shorter than the 4L70/65/60

2) the extra bulk of a 6L80 is primarily along the bottom, similar to a 4L80E that fits in GTO's

3) the 6L80 has a similar top deck profile and overall length as the T-56 due to the tile house extension shifter that comes on GTO's. The A4's have a sloping and narrowing top profile.

4) Holden had to give enough floor pan transmission tunnel space to accommodate the 2 pc drive-shaft's suspension movement

5) once installed in the Trailblazer there was still a good inch+ plus of room all around the 6L80 transmission. Enough to throw over all the dangling wire and connectors left over from the 4L70 with no interference with the floor pan

6) I used and compared transmission length and girth reference points to the undercarriage photo of the '04 GTO exhaust that is floating around on the web.

7) I used and compared transmission lengths, girths, etc reference points in relations to the bell housings and engines.

8) Considering the GTO/Monaro/Commie was designed to accommodate the added components of AWD and was designed in the late 90',s as our truck was, I'm sure there is more than enough room under there as engineering tolerances were not what they are now



I have LSX 450 ci with 4 Litre Whipple 15 psi driving through a 4L80e converted to LH AWD drive out of the box and Tru Trac diff in rear.

This is in a VY Adventra (Commodore SW)

Extreme modification to the rear of the auto and new AWD gears and housing made to fit, auto shortened about 100mm so original mountings fit no engineering needed.

30,000 klms with no issues with the box.

I can pull some pictures out of my butt if needed, conversion was in a mag. would need to find the mag (from my pile of crap) and scan and post.

Cheers

Steve

[surfwagon]

I have LSX 450 ci with 4 Litre Whipple 15 psi driving through a 4L80e converted to LH AWD drive out of the box and Tru Trac diff in rear.


Cheers

Steve

Hey Steve

Did you mean to say 6L80e in your Adventra.
That is what is being discussed, whether a 6L80e will physically fit into the VT-VZ chassis with out floor pan mods.
Also wether the conversion is worth the trouble cost versus advantages of having 6 speed auto instead of 4.

[hRTHSV]

I can't see why a 6L80 won't fit in the VT - VZ it fits in my VS with no floor mods.

[Blown 454 AWD]

Hey Steve

Did you mean to say 6L80e in your Adventra.
That is what is being discussed, whether a 6L80e will physically fit into the VT-VZ chassis with out floor pan mods.
Also wether the conversion is worth the trouble cost versus advantages of having 6 speed auto instead of 4.

4L80e in mine, 6L80e didn't exist when I did mine :)

From what I hear the 6L80e doesn't appear to be as strong as the 4L80e ?????

With plenty of grunt 4 - 6 speed, who cares? they go like the clappers.

Bet even a Power-glide (2 soeed) would go well in mine, it's all about power.

Just need it not to break.

Cheers

Steve