Need help or advice on a 5.3 swap!

98blackbird

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Im new on here ive been doing a lot research on putting a 5.3 truck engine into a 98 trans am everything has been assembled and put to together now i just need to know what will i need to modify to get my 5.3 harness onto the trans am.

This is my first project bought the car as a roller.

Any help is appropriated thanks :hs:
 

phat_ridegt

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do you not have an ls1 harness? modifying the 5.3 harness and fuse box is plenty do-able but very consuming. you keeping abs or ac? if not id really recommend a standalone harness from a place like psi. simple plug n play and will allow the use of the fbody gauges ect....

unless you could source a stock fbody ls1 harness....not sure what they go for?
 

98blackbird

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no I do not have an ls1 harness. I am going to run abs but not ac. How much does a standlone harness run for? and i seen a ls1 harness they go for around 400-500 bucks thats how much I paid for the 5.3 with harness and PCM.
 

phat_ridegt

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You planning on using throttle by wire or cable? Depending what tb you are using you need to be sure your pcm has the driver for the iac. I'd recommend the 411 red/blue pcm if you are using dbc and use the truck blue/green if you're wanting dbw. I'd assume it would be easier to use the stock tb and cable depending on your setup
 

98blackbird

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i bought the engine with harness and computer. i was also thinking it would be a plug and play. well i am running an ls1 intake with the stock 5.3 TB. but since my car is ran with electric fans how would i be able to run them with the stock harness? & what is dbw? i kinda new to this lol
 

Donnie

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Fbodies utilized a DBC setup, which you'll want to stick with.

AFAIK, Gen III to Gen III, 24x to 24x should be good to go per electronics, my work on the LSx is all with aftermarket EMS though, so I can't tell you with any real certainty.

If you've already got truck electronics, I'd run 'em personally, but I don't know what your skillset is.


[MENTION=945]daturbosix[/MENTION]? :dunno:
 

Smokinhot

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The Motor plugs, I believe, should all be the same on an LS car and truck. The harness may be a little longer though because of how they run it. If you have an electronic setup, DBW, and want to use your ls1 intake and 5.3 TB. Then look into an 03+ TRUCK harness, it's DBW. if your going back to the cable route, an f-body harness will work or a 99-02 truck harness. Depending on your intake, is what I would choose. The truck intake have a couple extra plugs for the evap system right on the intake. But that can also be easily tuned out.
 

phat_ridegt

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the dbw setup will be challenging to setup the throttle pedal because the truck pedal sticks out waaay farther than any of the car dbc throttle pedals do that i've seen. ask me how i know....lol

but the cam/crank sensor will be the same between the two harness, if you have a dbw harness, it wont work for a normal cable drive throttle body. the time/money to modify it so it doesnt utilize the the tac module and whatnot will surely be more than buying an ls1 harness.

the oil pressure switch for the two motors are different but i would just but an fbody one so the factory gauges will work.
 

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