6.2 ls3 GM performance crate engine

[Marky Dissod]

... a 10L80 w/3.42 might perform better than a 6L80 w/3.73? (while costing more as well)

May I show you something?

10L80: ... 4.69 ... 2.99 ... 2.15 ... 1.77 ... 1.52 ... 1.28 ... 1.000 ... 0.85 ... 0.69 ... 0.64 (7.32 Spread)
6L80E: . . . . 4.03 . . . . 2.36 . . . . . . . . . 1.53 . . . . 1.15 . . . . . . . 0.85 . . . . . 0.67 (6.01 Spread)

Awfully imprecise, yet it still manages to visually represent the improvement from the 6L80 to the 10L80.
10L80 not only has more gears than the 6L80, most of those additional gears are more assertive.
Look at it long enough, you'll see: it'd literally be COUNTERproductive to give the 10L80 any more axle gear.

3.23 is the GM OE axle gear for every suv with 10L80. OK, watch this:
10L80 x 3.23 axle: ... 15.15 ... 9.66 ... 6.95 ... 5.72 ... 4.91 ... 4.13 ... 3.231 ... 2.75 ... 2.23 ... 2.07 (7.32 Spread)
6L80E x 3.42 axle: . . . . 13.78 . . . 8.07 . . . . . . . 5.23 . . . . . . . 3.93 . . . . . 2.91 . . . . 2.29 (6.01 Spread)
6L80E x 3.08 axle: . . . . . 12.41 . . .. 7.27 . . . . . . . . . . 4.71 . . . . 3.54 . . . . . . 2.62 . . . . . . . 2.06 (6.01 Spread)

OK, so, if highway MpG is more important to you / her, then go with 3.42 with the 6L80E.
But if metro / urban stop'n'go, or towing / hauling is more important, seriously consider 3.73 with 6L80E.

Bet his wife'd NEVER let him have a 6.7L.

 

[mikez71]

Added a couple combos...
10L80 I used 4.70, 2.99, 2.15, 1.80 , 1.52, 1.28, 1, .85, .69, .64

10L80 x 3.08 axle: .... 14.48 ... 9.21 .... 6.62 .... 5.54 ... 4.68 ... 3.94 ... 3.08 ... 2.62 ... 2.13 ... 1.98 <------------------------------?
10L80 x 3.23 axle: .. 15.15 ... 9.66 ... 6.95 .... 5.72 ... 4.91 ... 4.13 ... 3.23 ... 2.75 ... 2.23 ... 2.07 (7.32 Spread)
10L80 x 3.42 axle: ..16.07 .. 10.23 ... 7.35 ... 6.16 ... 5.20 ... 4.38 ... 3.42 ... 2.91 ... 2.36 .. 2.19 <-------------------------------?

6l80 I used 4.027, 2.364, 1.532, 1.152, .852, .667

6L80E x 3.08 axle: . . . . . 12.41 . . . .. 7.27 . . . . . . . . 4.71 . . . . . 3.54 . . . . . . 2.62 . . . . . 2.06 (6.01 Spread)
6L80E x 3.42 axle: . . . . 13.78 . . . 8.08 . . . . . . . . 5.24 . . . . . 3.93 . . . . . .. 2.91 . . . 2.28 (6.01 Spread)
6L80E x 3.73 axle: .... 15.02 . . . 8.82 . . . . . .. 5.71 . . . . . . . 4.30 . . . 3.18 . . . .. 2.49 <-------------------------------?

Looking at that I might as well stay 3.08 if going 10L80.
But it doesn't look like a 10L80 with 3.42 would be particularly bad..

But yea, 3.73 definately spaces out nicely...

 

[j91z28d1]

do they have a 10 speed swap dialed in yet for these trucks? do you need a stand along controller or a segment swap in hp do it?

 

[mikez71]

Home - Powertrain Swap Solutions

www.powertrainswapsolutions.com

Pretty sure they are including a standard GM tcm that you plugin..
Probably this.. https://www.hptuners.com/product/gm-t93-tcm-service-global-b/

 

[j91z28d1]

Home - Powertrain Swap Solutions

www.powertrainswapsolutions.com

Pretty sure they are including a standard GM tcm that you plugin..
Probably this.. https://www.hptuners.com/product/gm-t93-tcm-service-global-b/

supposedly there's a guy that makes a sub harness to go between your ecm and whatever tcm you need to run for the 10. Hopefully there's a tcm that does it besides the global B that can control it. that adds a lot of cost.

sadly I see hints that the gm 10 isn't very good in stock form long term. so you'll have added cost of beefing up what's needed to make it live longer than they do in the stock trucks to factory in. you could easily have $10k in this swap by the time you're done.

if it was mine I'd leave all that alone and do the fun part of building a motor first. more enjoyable to me than working on drivetrains, especially if you don't have lift access and some friends to help. if you still don't have the power you need, then go for it.

 

[mikez71]

I could be completely wrong about that tcm, but I thought it was a stock GM unit and being that's the one shown for 10speeds..

That's too bad about the durability of the 10L..

Thinking about it more, I really don't need the performance and added cost/hassle of it as well...

Axle swap and I can decide if the ratio will be adequte while I keep it in 2wd for awhile! Cheap and easy first!