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LSx engine install questions....

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LSx engine install questions....

susan12 susan12
New User | Posts: 1 | Joined: 08/12
Posted: 08/06/12
08:08 PM

Hi all,

I wanna know what all do you need to get to put an LSx style engine with either a 4L60E, or a 4L80E into an old car?

I'm talking wiring and PCM/fuel management, not the basics of the install such as headers and brackets.

One more question, could I change the stock exhaust manifolds to headers without having to do a custom burn for the PCM?

Thanks in advance,


Scott Parker Scott Parker
Moderator | Posts: 215 | Joined: 12/07
Posted: 08/07/12
01:30 PM

You will need a stand-alone wiring harness and computer. Painless and Speartech are good leads. Headers alone do not necessarily require a re-tune, but the other components of your combination may. For example, if you are running headers with no cats, you will most certainly need a tune.  

pepsi1 pepsi1
User | Posts: 111 | Joined: 09/11
Posted: 08/16/12
09:16 AM

susan12 Welcome aboard to our forum...

There are a couple LSX trans kits from GM that you can purchase from a GM Parts counter. Let me see if I can help you with P/N's.

1.P/N 19257634. !996 to 2008 the 4L60-E transmission family. Fits P/N 19244043 Chevy Performance SuperMatic.

2.P/N 19257661. 1993-Up 4L80-E. Fits P/N 19154550 Chevrolet Performance SuperMatic.

3.P/N 19212657. Transmission Controller for 4L60-E,4L65-E,4L70-E,4L80-E,and 4L85-E Automatics.

4.P/N 19154766. Transmission adapter kit. Allows installation of Gen.III/IV
4L60-E/4L65-E in the Gen.I and II engines.

I hope this helps.

aldoty440 aldoty440
New User | Posts: 7 | Joined: 09/12
Posted: 09/25/12
01:21 AM

after market sush as holly have the whole setup .manifold with carb is cheapest way
no pcm required. they allso have to F.I. SYSYEM CONPLETE WITH PCM.  headers will work with the o2 senser bung on them.