6.0 4L80E swap to 8.1 Allison

[Stiner]

I have an '01 2500HD with 6.0 4L80E with 103,000 miles, tranny's slipping in dire need of replacement, the engine is been used and abused. Instead of putting in a rebuilt 4L80E and adding tuner mods(MAS Air, Intake, Throttle Body, Power Programmer) I figured maybe we will spend that tax return money wisely and put some serious muscle under the hood, a swap to the 8.1 with the Allison bolted up. Has any one attempted this, and do I need to change the whole set-up, i.e. wiring harness, computer, fuel pump, transfer case adapters. And if it is possible, where is a good place for those drivetrain parts. I know it's alot to ask on my first posting, but any help would be greatly appreciated.

[TieRod]

You would be best off to keep the 4L80E. Have built to holds some power it will do fine. You can use the 6.0 ECU and wiring harness for a 8.1. Use a Ls1edit or HPTuner to get it dialed in.

[Stiner]

You would be best off to keep the 4L80E. Have built to holds some power it will do fine. You can use the 6.0 ECU and wiring harness for a 8.1. Use a Ls1edit or HPTuner to get it dialed in.

 

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[Stiner]

I think I will stay with the current 4l80E, TCI said they would build a beefy towing monster for about $3500 if anyone's interested.

[KTSTEEL]

d**n that is alot for a tranny.

 

My tranny for my race car didnt even cost that much and it is rated @ 800 hp.