4.2 to 5.3 Swap In Progress - Page 2 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #11  
Old 08-05-2015, 01:36 AM
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kingsauto75 kingsauto75 is offline
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2003 5 lift with BFG MT tires 33s 17 rims
Hot rod flat black 5.3L V8 4X4
Join Date: Feb 2010
Location: sanborn, ny
Posts: 3
5.3 swap

Putting a 2004 gmc envoy 5.3 in my 2003 trailblazer lifted 5" with 285/70/17
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  #12  
Old 04-19-2016, 10:36 PM
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CoreyH CoreyH is offline
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2004 Chevy TrailBlazer LS
Satin Black 4.2L I6 4X4
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Location: California, MO
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Just seen this and noticed no activity for awhile, wanted to see if any updates were made.
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  #13  
Old 06-17-2017, 01:44 PM
seanb81 seanb81 is offline
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2007 GMC TrailBlazer LS
Sand Beige Metallic 4.2L I6 4X4
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Quote:
Originally Posted by CoreyH View Post
Just seen this and noticed no activity for awhile, wanted to see if any updates were made.
bump? just bought a 4.2 with knock for the sake of swapping it. done a few swaps in my life, just curious how bad cross members and wiring will be or was for anybody else.

i swear if i cant find anything online for this, ill document mine step for step so that there's never another living non V8 swapped TB -_-
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  #14  
Old 08-01-2017, 01:31 AM
wuntun wuntun is offline
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2002 GMC Envoy SLT
Black 4.2L I6 4X4
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Location: sandhill, ga
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progress?

How are you coming along sean?
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  #15  
Old 08-01-2017, 01:01 PM
seanb81 seanb81 is offline
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2007 GMC TrailBlazer LS
Sand Beige Metallic 4.2L I6 4X4
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Location: Denver
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Originally Posted by wuntun View Post
How are you coming along sean?
so far just getting lucky but not working on it for another ~2 weeks. i have 2 cadillac STS's that im carving apart and creating a single STS out of, and that project is nearing an end now.

After purchasing a 5.3 engine, 5.3 harness, 0411 ECM, and 5.3 TB oil pan, i found an entire donor Envoy to pull everything from. Nobody showed any interest in it for a couple of weeks, so I got lucky with the price - $1200 for the entire vehicle. Here in CO, vehicles go for 20% more than normal, so if you look at it as a $1000 donor, its not so bad.

I did tell the owner of the salvage yard that I want to fully take photos of the frame, as I keep hearing the frame is different, and that I might want to cut some pieces of it off for the project. He offered to lift it up on a forklift for me so I can get all of the pieces/photos I need.

I'll document the hell out of it as best as I can. There's sooo many TB's out there for so cheap that its a shame nobody else has already done this.
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  #16  
Old 11-27-2017, 09:55 AM
seanb81 seanb81 is offline
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2007 GMC TrailBlazer LS
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to follow up, i have the engine, trans, harness, all of the 4x4 stuff, and i plasma cut the mounting system off of a donor. there's really no way in hell this wont work.

my plans got all derailed with work having me busier than anticipated this year, but im still planning on having this done prior to spring.
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  #17  
Old 04-03-2018, 02:47 PM
seanb81 seanb81 is offline
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2007 GMC TrailBlazer LS
Sand Beige Metallic 4.2L I6 4X4
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Location: Denver
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man, nobody else beat me to it, yet?

so i moved, changed jobs, etc. garage is a wreck. i have the entire dropout assembly from a 5.3 trailblazer, i plasma cut the mounts off, in case i need them. i dont see how this isnt a relatively easy swap.

worst case/fears:

* axles are different, so it may overpower the diff. but thats a common thing to address
* fuel pump may be deficient, but a bigger pump & in-line regulator is no big deal

i dont even see why the gauges wouldnt work. im starting this in about 4 weeks, at my current availability.
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  #18  
Old 04-11-2018, 09:28 AM
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Chevelle598BB Chevelle598BB is offline
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2002 GMC Envoy SLE
Pewter Metallic 4.2L I6 4X4
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Location: DFW, Texas
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The motor mount brackets will need to be swapped to use the v8 motor mounts. The gauges should work fine with the 5.3 sending units. The rearend will work for now and may live for a long time depending on your driving. The drive shaft lengths will be different for the front and rear shafts due to the trans mounting location being different than the 4.2. I hear the v8 trailblazers and I6 trailblazers have different brake lines because the abs modules are in different spots. I have only read this and not confirmed in person. As far as the fuel line goes you should be able to get one from a v8 trailblazer from the filter to the fuel rail. I believe they are all returnless.

Definitely keep us updated of the swap progress. I will be swapping a 5.3 into my 02 before too long. I have done several LS swaps on several cars. This one seems pretty straight forward. I’m just going to buy a donor 03 or 04 XL with a 5.3 and take everything I need off and scrap the rest.
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