LT1DG

I'm trying to figure out what all I need for this process,
I know that I need a ls1 k member and a LS steering rack in order for the ls headers to fit.

I wanted to use adapter for lt1 k member, but let know what your options are on that.

​​​​​​And I'm probably just gonna buy a 4l80e so installation is not so difficult.

What about driveshaft? And gear ratio? I got the stock 2.72 gears. Will that work with the 4l80e?

Also I want to know can I use a 411 ls1 pcm to run the ls3 wiring harness ? Or do I have to found the actual 2010 pcm?

And also I'm still confused on if I can use ls1 wiring harness or will it be best to get a ls3 wiring harness?
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​I've read that the ls3 is a DBW (Drive by wire) and i would have to swap throttle body with a drive by cable throttle body.

What else all I need? Any advice will help.

This is 1995 trans am btw

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93Z2871805

iTrader: (5)

I replied in the other thread as well.

An LS3 will have a 58x reluctor, so you would need a signal converter to use an 0411.

In today's age, I'd go Holley EFI and not mess with the factory ECU.

Additionally, I'd start looking for a different rear and associated drive shaft, the factory 10 bolt leaves a lot to be desired.

G Atsma

The 2.72 gears will be useless behind any O/D transmission. Get a set of 3.50 gears for best flexibility

LT1DG

https://www.holley.com/products/ls_power/ls_efi_systems/parts/550-905

Is this what your talking about? 👆👆👆


I was thinking about running a 3.42 gears, and I heard that the steel driveshaft is usable, and would be good for drag racing. Correct me if I'm wrong.

LT1DG

Yea when it comes to speed, the 2.72 gears are useless. But is good on gas 😂😂😂

I was thinking 3.42s, but 3.50 gears will be better.

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G Atsma

You'll be just as good or better on gas with the 3.42 gears and the O/D gear. 3.42 is very common. Just use those.

LT1DG

My last firebird v6 01, came stock with 3.42. Wish I would took it off when I wrecked it

But defiantly a plan to do with the swap.

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93Z2871805

iTrader: (5)

Yes, personally though, I wouldn't opt for the handheld and just use a laptop (it's cheaper).

I'll follow up with, regardless of your driveshaft and gear selection, I'd ditch the factory 10 bolt if you plan to hit the tires with any intentions of drag racing.

LT1DG

It seem like a good holley kit, even with the hand held. I would have to buy a PC, I don't have one as of now. We'll see

I'll probably do a 3.42 swap on the rear.

Also will I be able to swap a drive by cable throttle body with out issue?

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93Z2871805

iTrader: (5)

You'd need a laptop to tune it, the handheld only does basic setup. Any cheap windows laptop will do.

You can run either DBC or DBW as you choose.

LT1DG

How would that work, when the fbody has a drive by able? DBC seem more logical.

Sorry for the newb questions, I wanna make sure that I do this correctly.

93Z2871805

iTrader: (5)

The Holley EFI can control either one. It's in the software. Basically it's just a difference in harness connectors, either way the ECU can control either TPS/IAC or pedal/DBW stepper, it just depends on what you tell the ECU to manage. To clarify, you'd swap out your pedal assembly for a DBW pedal if you were to go that route.