6L80E into a 4th gen swaps
look up true blue Motorsports. They specialize in that area. I'm about to purchase one of their kits to put in my envoy Denali. Found a great deal on a transmission and their kit is only a little over 1k. So for about 1800 I'll have a six speed transmission in my dinosaur truck
Teching In
Joined: Mar 2015
Posts: 20
Likes: 8
Just completed swapping a 6l90 (out of a truck) into my 02 ws6 with a 408.
No cutting of tunnel required
Truck pan hangs pretty low, would recommend using a ctsv pan
stock 4th gen shifter and cable (custom bracket to mount to trans)
UPR t56 crossmember with hole drilled about ~2” forward
speed engineering tunnel mount torque arm
PST driveshaft (truck yoke is 1410 and have stock 10 bolt diff)
Using a ProEFI 128 ECU to control engine and communicate CAN data to TCM for proper operation (have 411 piggyback so dash/emissions work)
No cutting of tunnel required
Truck pan hangs pretty low, would recommend using a ctsv pan
stock 4th gen shifter and cable (custom bracket to mount to trans)
UPR t56 crossmember with hole drilled about ~2” forward
speed engineering tunnel mount torque arm
PST driveshaft (truck yoke is 1410 and have stock 10 bolt diff)
Using a ProEFI 128 ECU to control engine and communicate CAN data to TCM for proper operation (have 411 piggyback so dash/emissions work)
Just completed swapping a 6l90 (out of a truck) into my 02 ws6 with a 408.
No cutting of tunnel required
Truck pan hangs pretty low, would recommend using a ctsv pan
stock 4th gen shifter and cable (custom bracket to mount to trans)
UPR t56 crossmember with hole drilled about ~2” forward
speed engineering tunnel mount torque arm
PST driveshaft (truck yoke is 1410 and have stock 10 bolt diff)
Using a ProEFI 128 ECU to control engine and communicate CAN data to TCM for proper operation (have 411 piggyback so dash/emissions work)
No cutting of tunnel required
Truck pan hangs pretty low, would recommend using a ctsv pan
stock 4th gen shifter and cable (custom bracket to mount to trans)
UPR t56 crossmember with hole drilled about ~2” forward
speed engineering tunnel mount torque arm
PST driveshaft (truck yoke is 1410 and have stock 10 bolt diff)
Using a ProEFI 128 ECU to control engine and communicate CAN data to TCM for proper operation (have 411 piggyback so dash/emissions work)
Last edited by warriorpluto; Jun 9, 2019 at 06:50 PM.
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TECH Junkie
Joined: Jun 2008
Posts: 3,203
Likes: 1,391
From: Nitro Alley
Yuck... Modern GM Transmissions...
GM has not designed, nor produced a Transmission worthy of a high power build in way too long.
Everything since the 4L80E has been sadly so inherently weak with nearly every shift requiring a synchronous clutch change.
Junk!
GM has not designed, nor produced a Transmission worthy of a high power build in way too long.
Everything since the 4L80E has been sadly so inherently weak with nearly every shift requiring a synchronous clutch change.
Junk!
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TECH Junkie
Joined: Jun 2008
Posts: 3,203
Likes: 1,391
From: Nitro Alley
Really... NoBody has...
The most development... In high performance transmissions, has sadly been with ZF and NOT GM...
Hopefully one day, GM will build further on the THM-400 design or something more robust like a Lenco.
The most development... In high performance transmissions, has sadly been with ZF and NOT GM...
Hopefully one day, GM will build further on the THM-400 design or something more robust like a Lenco.
TECH Junkie
Joined: Dec 2012
Posts: 3,618
Likes: 1,328
From: Iowa
Synchronous shift transmissions can be plenty strong if they are paired with the proper programming. Plenty of guys making 700 horse on stock 6l80's in camaros and ctsv's. They also fail in stock form when the drums crack around the weld, or the converter takes a dump.
They're just like any other trans...they have their benefits (4.xx 1st gear and a 6.xx overdrive ratio) and their pitfalls (crappy tune can smoke a trans, bad converters, failure prone drums and sol blocks)
10 years ago if you told people a 700hp 4l60e was realistic...they would have laughed you right out of the forum...yet there are multiple companies successfully offering just that with a warranty
6L and 8L series are just the same...give them 10 more years of aftermarket parts development, builder/tuner experience, and lessons learned and you will have one heck of a trans
They're just like any other trans...they have their benefits (4.xx 1st gear and a 6.xx overdrive ratio) and their pitfalls (crappy tune can smoke a trans, bad converters, failure prone drums and sol blocks)
10 years ago if you told people a 700hp 4l60e was realistic...they would have laughed you right out of the forum...yet there are multiple companies successfully offering just that with a warranty
6L and 8L series are just the same...give them 10 more years of aftermarket parts development, builder/tuner experience, and lessons learned and you will have one heck of a trans
Teching In
Joined: Mar 2015
Posts: 20
Likes: 8
Got torque reduction and shift points dialed in this week. This swap really modernizes these cars.
Next up will be wiring the TUTD function to the c6 steering wheel I have in the car
Next up will be wiring the TUTD function to the c6 steering wheel I have in the car
Last edited by n3mi5is; Jun 15, 2019 at 09:45 PM.
Just completed swapping a 6l90 (out of a truck) into my 02 ws6 with a 408.
No cutting of tunnel required
Truck pan hangs pretty low, would recommend using a ctsv pan
stock 4th gen shifter and cable (custom bracket to mount to trans)
UPR t56 crossmember with hole drilled about ~2” forward
speed engineering tunnel mount torque arm
PST driveshaft (truck yoke is 1410 and have stock 10 bolt diff)
Using a ProEFI 128 ECU to control engine and communicate CAN data to TCM for proper operation (have 411 piggyback so dash/emissions work)
No cutting of tunnel required
Truck pan hangs pretty low, would recommend using a ctsv pan
stock 4th gen shifter and cable (custom bracket to mount to trans)
UPR t56 crossmember with hole drilled about ~2” forward
speed engineering tunnel mount torque arm
PST driveshaft (truck yoke is 1410 and have stock 10 bolt diff)
Using a ProEFI 128 ECU to control engine and communicate CAN data to TCM for proper operation (have 411 piggyback so dash/emissions work)
Teching In
Joined: Apr 2020
Posts: 23
Likes: 1
From: Canada
just curious what you guys used to control the electric shifter. Where you able to install paddle shifters?
Teching In
Joined: Apr 2020
Posts: 23
Likes: 1
From: Canada
Just started putting it in today as a matter a fact. We customized the factory crossmember and have a bit more to go tomorrow. I think the cost is worth it. I am in Canada so the total cost will be around 12k. I couldn’t keep a 4l60 in it so I had no choice. I am really looking forward to see how it works when completed. I think the first gear will work well and look forward to having the electronic shift. I am not going to bother with the paddle shifter right now. I will post any info/knowledge I have gained to help others.
I'd like to keep this convo rolling. I'm super interested in what controller folks are using for this swap and how much tunnel massaging is needed to get a 6L80 installed. I'm trying to maintain a stock interior and using the stock shifter would be slick.
Teching In
Joined: Apr 2020
Posts: 23
Likes: 1
From: Canada
there is no modifications needed to the tunnel. A slight modification to the transmission mount as the 6l80 mount is further back and the rear torque arm needs to be mounted with either a relocation bracket or customize a mount. For wiring I used a unit from zero gravity that comes with a computer pcs 2650. I have had some issues with the computer but have not had time to get to the bottom of it. Jim at zero gravity has been helpful so far but like I said I just haven’t had time. You can absolutely use your stock shifter and no alterations to interior.
there is no modifications needed to the tunnel. A slight modification to the transmission mount as the 6l80 mount is further back and the rear torque arm needs to be mounted with either a relocation bracket or customize a mount. For wiring I used a unit from zero gravity that comes with a computer pcs 2650. I have had some issues with the computer but have not had time to get to the bottom of it. Jim at zero gravity has been helpful so far but like I said I just haven’t had time. You can absolutely use your stock shifter and no alterations to interior.