Swapping 5.3L to 6.0L - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Engine tuning and/or modifications

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Old 01-14-2013, 07:20 PM
02Tahoelt 02Tahoelt is offline
Junior Member
2006 GMC Envoy Denali XL
Liquid Silver Metallic 5.3L V8 2WD
Join Date: Oct 2011
Location: Miami, Fl
Posts: 22
Swapping 5.3L to 6.0L

I have a 2006 Gmc Envoy XL Denali w/ 5.3L RWD, thinking about swapping in USED (72k) 2007 Trailblazer SS 6.0L w/ RWD 4L70E comes with engine,tranny,wire harness and ecm.
Any problems that I might encounter? I've been hearing about a second sensor on tranny, Is there a fix for that? How can I wire that up? Do they sell some kind of harness for that.

It's eithier that or pull my 5.3L and getting a Fresh rebuild and adding Cam, some port work, and slight deck to the heads, maybe some headers and ALOT of Tuning. But then I'll still be having a tranny issue down the road. Knocking at my door

Has anyone successfully done a Trailblazer SS swap into any kind of TV?

Thanks for any info in advance
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Old 04-02-2013, 08:04 PM
speedmon speedmon is offline
Junior Member
2002 GMC Envoy SLT
Black Granite Metallic 4.2L I6 2WD
Join Date: Mar 2013
Location: OC, CA
Posts: 11
I realize this thread is a bit old but I'll chime in as I come from the LS world.

I wouldn't really worry about the 4L60E too much (the 6.0L will bolt right up)...it can take a lot of power before it breaks and even if it does, that trans can be built to handle 1100 hp easy......Look at Mad Dog Transmissions....

I just bought a 4.2L-I6 for my son and had to really fight myself not to buy a 5.3L V8 one......Thats a GREAT engine. Stock bottom+ported heads+ported LS2 manifold+cam=450whp.......the LS2 6.0L can easily go 500whp.

Also....the 5.3L stock engine can take A LOT of boost.....like 18-20lbs before the heads lift. With a ZR1 cam that engine can make 700+whp......
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