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L83 to L86 swap

Clutch Bo
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Clutch Bo Enthusiast

Clutch Bo

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I have a 5.3 with the 6L80 in it and was hoping to swap over to a 6.2 but i can’t find much online about what i will need to replace, anything would help. I know i’ll need a new ECM and possibly a new flex plate but besides that i’m not sure. Thanks in advance!

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flyingfool
flyingfool

i dont see why you need a different ecu. mechanically identical engines, besides the different displacements and maybe forged internals. so much cheaper to just turbo the 5.3

Clutch Bo
Clutch Bo

guys i hardly ever tow, it’s strictly for the power haha

Snowcamo
Snowcamo

Do the swap. It'll give us a guide to follow. Not much info or knowledgeable folk out there... Sent from my LG-G710 using Tapatalk

ullose272 Enthusiast

ullose272

Posted
Posted
I have a 5.3 with the 6L80 in it and was hoping to swap over to a 6.2 but i can’t find much online about what i will need to replace, anything would help. I know i’ll need a new ECM and possibly a new flex plate but besides that i’m not sure. Thanks in advance!
I may be wrong, but you may be able to just tune the l83 ecu for the l86.

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flyingfool Senior Enthusiast

flyingfool

Posted
Posted

i dont see why you need a different ecu. mechanically identical engines, besides the different displacements and maybe forged internals. so much cheaper to just turbo the 5.3

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ullose272 Enthusiast

ullose272

Posted
Posted
i dont see why you need a different ecu. mechanically identical engines, besides the different displacements and maybe forged internals. so much cheaper to just turbo the 5.3
Cheaper maybe, but probably less reliable if you do much towing

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Donstar Senior Enthusiast

Donstar

Posted
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56 minutes ago, ullose272 said:

Cheaper maybe, but probably less reliable if you do much towing

Your stock 5.3 will comfortably tow your maximum towing limit.  Swapping engines will potentially increase your fun factor but may be disappointing, imo, if you are hoping to increase towing abilities.   Keep us posted on your progress!

ullose272 Enthusiast

ullose272

Posted
Posted
Your stock 5.3 will comfortably tow your maximum towing limit.  Swapping engines will potentially increase your fun factor but may be disappointing, imo, if you are hoping to increase towing abilities.   Keep us posted on your progress!
True, this isnt my thread but just saying. I have the 5.3 in my truck and the 6.2 in my yukon, the yukon has noticably more power. And you will lose little to no reliability with a 6.2 swap

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JONBLARC7 Enthusiast

JONBLARC7

Posted
Posted

6.2 tows really really well.  No more down shifting for every little rise in the road.  And I used to have an old 6.2 with full bolt ons.  These new ones are a different animal.

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flyingfool Senior Enthusiast

flyingfool

Posted
Posted (edited)

probably better off with a new set of ring gears if your towing with the 5.3, i recommend the  3.75-4.10 gears way more torque out put on the 5.3 vs the economy gears. this is the easiest of all swaps.

also tuning the tcm for less down shifts on the stock trans. factory  is ridiculous on thier shifting and over revving. its all based on emmisions and not usable torque.

Edited by flyingfool
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Snowcamo Senior Enthusiast

Snowcamo

Posted
Posted

Do the swap. It'll give us a guide to follow. Not much info or knowledgeable folk out there...

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CamGTP Senior Enthusiast

CamGTP

Posted
Posted

There are minor difference between the years for the 5.3/6.2's. I believe most of it is at the mechanical fuel pump and sensor/wiring to it.

 

If I remember reading right the 2014-16 are 4 pin and the 2017+ are 3 pin.

 

Here is the video. So finding a engine from the correct year should be done.

 

 

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