6L80 to 10L90 swap? Seeking insight on a 10 speed transmission upgrade

[mikez71]

The 10l80 conversion sounds like a significant upgrade, costing ~50% more than a good 6l80 rebuild.
If it performs.. I'm foregoing maintenance on my 210k 6L80 and saving for a 10L80!

Only additional modification (for 07-14) is having to shorten the transfer case input shaft (4WD).

 

[Pilot]

So everything went great with the 6 > 10 transmission swap. I really love it–it shifts quickly, stays in the useful power band; definitely happy with it. I got about 15 MPG on the 1500 mile trip from Delaware to Texas, and i got 17+. mpg on the way home. I got some video with Shawn at Powertrain Swap Solutions and I'll edit that and post it when I get some time. I flew out to Missouri yesterday on a whim and bought another car so that's keeping me distracted at the moment lol

 

[Tonyrodz]

So everything went great with the 6 > 10 transmission swap. I really love it–it shifts quickly, stays in the useful power band; definitely happy with it. I got about 15 MPG on the 1500 mile trip from Delaware to Texas, and i got 17+. mpg on the way home. I got some with Shawn at Powertrain Swap Solutions and I'll edit that and post it when I get some time. I flew out to Missouri yesterday on a whim and bought another car so that's keeping me distracted at the moment lol

What did you get?

 

[CMoore711]

So you the transmission you have now is an stock OEM GM 10l90 with an OEM GM torque converter? Did you go with a lightly used transmission and torque converter or a brand new one? Then Powertrain Swap Solutions offered and installed the conversion kit, installation, and tune for everything to work. Right?

 

[Pilot]

What did you get?

I bought a 1971 MG Midget

 

[Pilot]

So you the transmission you have now is an stock OEM GM 10l90 with an OEM GM torque converter? Did you go with a lightly used transmission and torque converter or a brand new one? Then Powertrain Swap Solutions offered and installed the conversion kit, installation, and tune for everything to work. Right?

Yep, we did not change the torque converter. Used the stock one in my Tahoe. Took a low mileage 2021 10 speed trans and installed it with the Powertrain Swap Solutions electronics kit. No tune was needed. All turnkey work took about a day and a half and cost $7,500 out the door for everything.

 

[Pilot]

I took some video of Shawn with Powertrain Swap Solutions explaining his platform and process. I'll post that ASAP.

 

[Thrust]

Where's the video? Interested in seeing what he says about your swap.

 

[JMH1980]

Where's the video? Interested in seeing what he says about your swap.

2nd this !!

 

[JMH1980]

Yep, we did not change the torque converter. Used the stock one in my Tahoe. Took a low mileage 2021 10 speed trans and installed it with the Powertrain Swap Solutions electronics kit. No tune was needed. All turnkey work took about a day and a half and cost $7,500 out the door for everything.

For $7,500 I might just bite the bullet on that instead of having my 8L90E rebuilt, when the time comes.