Anubis403

I have access to end of life 2003 and older GM trucks. If I'm looking for an ECM and harness to mod for use in a LS swap, which year or model is best? I plan to use a 6.2 truck engine and a 2004R transmission so I will need to swap over an older cable throttle body. Are there any years or models to stay away from?.....Any insight?

Thanks in advance.

Anubis403

Over 160 views but no responses....

Can anyone shed some insight on this?

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ls1nova71

iTrader: (4)

Your post is kind of confusing. First you say you can get 2003 and older trucks for parts, then say youre goung to use a 6.2? Do you mean 6.0? A 6.2 will have a different crank sensor/reluctor that wont work with a 2003 and older PCM without a Lingenfelter conversion box. If you are going to get a per 03 6.0, I would get a 2001 or newer since it wont have the cast iron heads. Other than that, newer is usually better since theyre constantly upgrading things at the factory.

Anubis403

Thanks for your input. I have a lead on a 6.2 engine minus engine harness and ECM but may go with a Texas Speed shortblock so I can specify the correct reluctor. The intent of my post was to try and understand if there are any ECMs or wiring harnesses to avoid. Perhaps the early years are not as easy to program or mod than later years...

oldgoat69

For the most part 03-07 truck PCM (green/blue) and the associated harness are all the same physically. ls1nova71 is right on the money in regard to the 6.0 vs. 6.2 and any of the later 58 tooth reluctor engines. If you are going to use a 200R4 the trans part save converter lockup is immaterial. Do you already have the trans? If not , you could go with a more contemporary trans. Just for grins what is the car?

Anubis403

The car is a 1986 442. I have always been an Oldsmobile guy but don't have a problem putting a GM corporate engine in my car. I am tired of working with 40 year old technology and I'm ready for EFI. LS is the best way to achieve this in my opinion. I am used to the low end torque of a large cube Oldsmobile so hopefully I won't be disappointed with what a 6.0 or 6.2 has to offer.

oldgoat69

The low end torque is different, but the overall drivability is much better. A possible choice would be an LQ4 or LQ9 03-07. These are relatively inexpensive and plentiful. A 4L60E would easily couple and would not require much if any at all massaging of the trans tunnel. You could most likely use all of the accessory drive and the PCM/wiring is an easy modification. Search the site for many other G-body swaps to get an example of what works.