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

[Bigburb3500]

Are there any other shops doing the 10L90 swap? I have sent several inquiries into PSS and have not heard back from them.

 

[gmartin1215]

Are there any other shops doing the 10L90 swap? I have sent several inquiries into PSS and have not heard back from them.

I chatted with them today and asked about that and if they are still doing conversions. They said...

"Yes we are still doing them! We've had overwhelming numbers of messages and are working to increase the capacity to reply to them all but some may have been missed, especially if they tried messaging personal accounts or other methods other than here(Facebook Messenger) or by email.

 

[Bigburb3500]

I chatted with them today and asked about that and if they are still doing conversions. They said...

"Yes we are still doing them! We've had overwhelming numbers of messages and are working to increase the capacity to reply to them all but some may have been missed, especially if they tried messaging personal accounts or other methods other than here(Facebook Messenger) or by email.

Ok! Thank you! I’ve been emailing their email listed so I’ll just be patient.

Thank you!

 

[CMoore711]

@Bigburb3500 PSS was delayed in responding to me also. If it’s been over a week and no response I would re-forward the same email with a “hey just following up as I hadn’t heard back”. I did that and they finally got back with me…

I do think they’re getting a lot of inquiries. I also think that most are probably through Facebook, and for those of us that don’t Facebook may contribute to delay in response…?

 

[Bigburb3500]

@Bigburb3500 PSS was delayed in responding to me also. If it’s been over a week and no response I would re-forward the same email with a “hey just following up as I hadn’t heard back”. I did that and they finally got back with me…

I do think they’re getting a lot of inquiries. I also think that most are probably through Facebook, and for those of us that don’t Facebook may contribute to delay in response…?

Facebook… hmm… I don’t have one but my wife does… if I use her account then she will know what I’m up to! Lol

 

[gmartin1215]

More from PSS chat...

"We sell the electronic control kits on the website if you're wanting to install yourself. If you want one done at our Nederland, TX shop then email [email protected] for a quote."

 

[swathdiver]

Here you go:

These RPMs do not include converter slip, usually about 7-20 rpms when locked up. The chart shows for fresh tires at full tread depth.

 

[gmartin1215]

Here you go:

View attachment 461450

View attachment 461451



These RPMs do not include converter slip, usually about 7-20 rpms when locked up. The chart shows for fresh tires at full tread depth.

Thanks for running the numbers!

If I am reading these right, it almost seems like if I did the upgrade to the 10-speed and keep the 3:42 diffs, then I may be ok not upgrading to the 3:73 diffs. The low gears in the 10 look like they can get the rig rolling, and the upper gears will help on the highway.

 

[swathdiver]

Thanks for running the numbers!

If I am reading these right, it almost seems like if I did the upgrade to the 10-speed and keep the 3:42 diffs, then I may be ok not upgrading to the 3:73 diffs. The low gears in the 10 look like they can get the rig rolling, and the upper gears will help on the highway.

You're welcome. The 10 speeds gives you lots of options.

Why are you considering this? Do you plan to keep the engine's power level the same or about the same as it is now?

 

[gmartin1215]

You're welcome. The 10 speeds gives you lots of options.

Why are you considering this? Do you plan to keep the engine's power level the same or about the same as it is now?

With my 5.3, 6L80, and 3:42, and the weight of the truck with the bumpers, winch, and the 33" tires, it takes a bit of inertia to get her rolling. With all the extras on it, I was considering just upgrading my diffs to 3:73 (or maybe 4.10) to help with getting the inertia closer to where it was stock, but I know if I did that, I know I will loose more on the high end for highway speeds and probably eat more highway gas. I noticed that newer rigs with the 10-speed often have a differential ratio of 3:23 with a 5.3. So I started thinking that if I put a 10-speed on with my 3:42s then I may not have to worry about upgrading to 3:73 to improve the inertia.

Additionally, I am considering the 10-speed because I have heard that it offers a better transmission than the 6L80. My 6l80 is the original and has not been touched except for an ATF change, but it's starting to give signs of its age with 155k on it, and also towing. With the weight of the truck, the 33s, and towing, there will be increased wear, which will likely necessitate rebuilding or replacement soon, as well as the installation of a better torque converter. With this 10-speed conversion offering, I thought that when the time comes, why not do this upgrade? It appears that it will help address the inertia problem and offer more cruising gears than the 6L80.
I suppose I could do the tranny conversion and see how it feels after that. Then, if it does seem like I need more umpf on the low end, put the 3:73s in. However, I wanted to see the differences between the combinations to gain a better understanding. That's why I asked you to run your calculator, to see the differences. Hope that makes sense.