4.2 to 5.3 Swap In Progress - 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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  #1  
Old 03-01-2014, 12:32 AM
2006Trail_LT's Avatar
2006Trail_LT 2006Trail_LT is offline
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2006 Chevy TrailBlazer LT
Black Granite Metallic 4.2L I6 2WD
Join Date: Sep 2013
Location: Iowa Park,Tx
Posts: 7
Lightbulb 4.2 to 5.3 Swap In Progress

Well my 4.2 liter inline 6 threw a rod this morning and i lucked out finding a 2004 5.3 liter for 400$ with PCM and complete harness, so now its time to start the swap, I've already got a pretty good idea of everything I may need
Only deal is the 5.3 came out of a pick up so I have to check my oil pan clearances, and im probably gonna just splice in the 4.2 BCM and Fuse panel into to 5.3 wiring harness I know it takes a little more time and its a hell of a lot more than anyone really wants to do but at the same time I'd rather do this than spend 600-1200$ on a complete wiring harness, and seeing as how i can't find a whole lot on anyone going thru with the swap because somehow they feel its not at all feasible, well I guess its about time to show you that if you want it you can do it
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  #2  
Old 04-10-2014, 08:09 PM
RyanA RyanA is offline
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2002 Olds Bravada
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Where have you ended up on this so far? I take if yours is a 2wd? If not, I'm sure you have figured out the TB oil pan has the differential attached to it. Also, I6 frame has the crossmember in a different location than a V8 one.
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Old 04-10-2014, 08:17 PM
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2006Trail_LT 2006Trail_LT is offline
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2006 Chevy TrailBlazer LT
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Quote:
Originally Posted by RyanA View Post
Where have you ended up on this so far? I take if yours is a 2wd? If not, I'm sure you have figured out the TB oil pan has the differential attached to it. Also, I6 frame has the crossmember in a different location than a V8 one.
Well I have only gotten as far as pulling motor and trans and getting lm7 ready I had quite the parts list to search for and I'm still looking for a set of motor mounts but everything is looking good I'm going to 3in exhaust with electronic cutout and getting a tune to delete some o2 sensors and the get valve as well as the smog equipment. Pretty much looking at doing a ss power train swap once I get it all done. But for now I'm just gonna use the 4l60e that it came with. Yeah it's only a 2wd I went ahead and got the oil pan tho got headers y pipe all the belt driven accessories I'll get some pics posted soon. But come to find out it threw a rod and I had all the pieces in my oil pan it was pretty wicked.
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Old 04-11-2014, 05:58 PM
Mounce Mounce is offline
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2004 Chevy TrailBlazer LS EXT
Black 4.2L I6 2WD
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Location: Tuscaloosa, KY
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The new motor had a thrown rod? Or the 4.2? Only reason I'm confused is because you've already stated that the 4.2 threw a rod in the first post.
If it's the new motor then that's a bummer.
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Old 04-11-2014, 06:16 PM
RyanA RyanA is offline
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2002 Olds Bravada
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Doing similar right now but I'm doing a complete TBSS AWD frame swap on my wife's Bravada. Will take measurements on the frames to finally have a definitive answer as to what exactly is different. Pretty sure all that is different is the trans crossmember location; engine mount bracket holes appear to be in the same spot and same configuration...
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Old 04-16-2014, 07:32 AM
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2006Trail_LT 2006Trail_LT is offline
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2006 Chevy TrailBlazer LT
Black Granite Metallic 4.2L I6 2WD
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Im coming along hust trying to find the full motormounts with brackets not having much luck.

Tried uploading photos of old block damage and new block but not having much luck on my phone hope to get them up soon tho.

RYANA. keep me posted on your swap I would like to see hiw it comes along and itd be nice to know the exact differences on the crossmemeber or whatever else
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  #7  
Old 04-17-2014, 11:15 AM
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Just subscribed. I have to do 5.3 engine swap as well.
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  #8  
Old 08-23-2014, 01:25 PM
LoBudgetSS LoBudgetSS is offline
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2002 Chevy TrailBlazer LS
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99% complete 02 trailblazer ls with lq4 6.0 here. The crossmember will have to be modified , as the trans will be a few inches further foreward. The engine mounts I have were purchased from Nalley Brunswick GMC in Brunswick Georgia. The oil pan and oil pump pickup tube was purchased through eBay, as it is necessary if you have and want to keep 4x4. The driveshafts were ebay used units as well (just replaced u-joints) from any v8 trailblazer based (swb) truck, al la envoy denali, bravada, rainier, 97x 5.3, etc. Exhaust came from OBX, which fit beautifully. I also installed an ls hotcam kit, double roller timing chain, and high volume oil pump. The only warning I can give to anyone doing this swap is remember to use the correct o-ring for the oil pump pick up, as they are not the same.
Also, I have only 1 issue, and it's the ebcm/bpmv mounting on the driver's side frame rail. After the swap, with the headers installed, the driver's side exhaust practically rests on the abs pump/module. I have yet to see any photos as to where this device mounts on an ss.
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Old 06-07-2015, 05:07 PM
Jbuggs1992 Jbuggs1992 is offline
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2002 Chevy TrailBlazer LS
Light Pewter Metallic 4.2L I6 2WD
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Quote:
Originally Posted by LoBudgetSS View Post
99% complete 02 trailblazer ls with lq4 6.0 here. The crossmember will have to be modified , as the trans will be a few inches further foreward. The engine mounts I have were purchased from Nalley Brunswick GMC in Brunswick Georgia. The oil pan and oil pump pickup tube was purchased through eBay, as it is necessary if you have and want to keep 4x4. The driveshafts were ebay used units as well (just replaced u-joints) from any v8 trailblazer based (swb) truck, al la envoy denali, bravada, rainier, 97x 5.3, etc. Exhaust came from OBX, which fit beautifully. I also installed an ls hotcam kit, double roller timing chain, and high volume oil pump. The only warning I can give to anyone doing this swap is remember to use the correct o-ring for the oil pump pick up, as they are not the same.
Also, I have only 1 issue, and it's the ebcm/bpmv mounting on the driver's side frame rail. After the swap, with the headers installed, the driver's side exhaust practically rests on the abs pump/module. I have yet to see any photos as to where this device mounts on an ss.
Would you happen to have a parts list for this swap i have a 5.3 and a 4l80e tranny already. now i just need to get the other parts together. thanks for the help.
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  #10  
Old 07-08-2015, 10:43 AM
Trailblazerlove Trailblazerlove is offline
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2004 Chevy TrailBlazer LT EXT
Black Granite Metallic 5.3L V8 4X4
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4.2 to a 5.3

The 5.3 is a strong and good engine i have 193k miles and she still pulls good
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