Smoke23

I have been searching and haven't been able to find a LSX conversion w/a 5.7. What I have currently is a 1997 K1500 4x4 w/a 4L60e tranny..

What I have bought is a 1998 LS1 from a 1998 Camaro w/a new set of bare 853 heads(non perimeter bolt), new set of valves and springs, LS6 Intake, ZO6 cam & lifter set. According to S & P all I will need is a few things to mate it to the 4L8-e tranny... I'll need the spacer adapter, oil/water pressure adapters and of course the motor mounts... Also best headers to buy to fit around everything and a X pipe as well...

BUT my big questions is they told me I would need to run my old pcm for the brakes and all that stuff and have 2nd pcm for the LS based engine and tranny stuff... Is there a PCM I can buy that can control it as one instead of running 2? Thanks for all the help fellas...

Mike

87DodgeD150

iTrader: (18)

Are you referring to a body control module?

Slick87Rush

iTrader: (3)

the ls1 pcm will control the transmission that is in your truck. I didn't keep the abs in mine. I only have one pcm the 0411 that i got out of a parts truck, i swapped the new cluster into the the dash because i liked the way it looked. I also did my own harness to save money. my set up is a lq4 i rebuilt from a shortblock and 4l80e out of the 02 parts truck.

Smoke23

Thats is what he said was the original pcm controlled the gauges and ABS stuff and the 2nd would just run the motor/tranny stuff. Then I seen a few saying they were controlling both by one pcm.... so it just has me confused a little...

Bo185

S&P has a good write up on the swap have you seen it or just talk to the mover the phone?

If you don't already have it.
http://www.hotrodlane.cc/PDFFILES/Lisa%20Tahoe.pdf

And are you doing an 4l80e swap at the same time? You will have to change the transfercase to 32sp input, redue rear trans mount, and driveshafts.

Smoke23

No I'm keeping the 4L80e... Just pulling the 5700 out and putting the LS 5.7 in. I talked w/ Mark over the phone seemed like a nice knowledgable guy. I was just seeing folks saying the did it off 1 PCM and he said to just use 2. I've already got the motor... Just finishing up a few parts and the PCM thing just had me wondering.... Scott I've tried to contact you a few time unless you've changed your #... LoL.

Bo185

I am overseas! So that's why I haven't answered. I will be home in Aug. though and can come buy and check out your projects.

Email me bo185@yahoo.com

And if am not mistaken the only 97 1500's with the 4l80 were the 6.5L units in 1997 sure you don't have the 4l60e?

the_merv

iTrader: (88)

It's a very common misconception that you have to "piggy back" the stock vehicle PCM to run the gauges, and use the LS1(or equivalent) PCM to run the Engine.

I've gotten into arguments with people about this, then I show them any of my 4 swaps that I've built..prove my point, confuse them and kick them in the nuts.

The PCM or BCM does not control the ABS..I guess none of you guys have heard of the ABS Module..

LS1 PCM will run all the gauges in the 1997 truck without issue. The 1997 4L60E will bolt up and work fine..just a couple of gauge settings that will need to be changed with a tune. Since you have the 4L80E Flexplate and Spacer already its ready to bolt up to the stock 1997 Convertor, just elongate the holes in the Flexplate.

If you want the '80 you will need to change parts in the Tcase like mentioned.

Bo185

The 97 truck 4l60e still needs a spacer and elongate the holes as it was an SBC motor still. He said he has a 4l80e to add he just needs the flat flex plate that will already should have the spacer on it, longer crank bolts and bolt it right up not need to elongate holes with six tq bolts.

According to S&P the L31 PCM sends VSS data to the ABS module for ABS to work I assume. It also provide the speedo input I assume. I sure the LS PCM could be made to do this as you can do 411 swaps with the L31. Just need to match the pinups of the old PCM to new to see where the signals need to go to tap in.

Smoke23

My bad I fat fingered it.... I have a 4l60e...

the_merv

iTrader: (88)

I misread it as you had the Flexplate & Spacer already..refer to above when you get ahold of them. I had to elongate holes on mine.

You wont need oil sensor or temp sensor adapters..just use the LS stuff with the right connectors and ensure its wired correctly.

tfi racing

iTrader: (2)

Are you sure about that?I had to run the 98 truck oil sender and water sender
to run the 98 truck gauges,but not a big deal,just remember to drill and re-tap one of the heads for the 98 water sender before the engine goes in,and one of the adapters from the $10 Equus fitting package took care of the oil sender.Just leave the LS water temp sensor as is,the PCM needs that input but no oil pressure,temp or level required for the LS PCM.

the_merv

iTrader: (88)

I'm pretty sure..

1998 is a wierd year the way everything was wired..the Oil Sensor had 3 wires. 99-02 has 1 wire.
The Temp Sensor used is the 1998 3-wire, GM 12551708.
That gives signal to the PCM and the Gauge..no need for a second sensor.

His is a 1997 truck..so he just needs the one wire Oil Sensor and that LS 1998 Temp Sensor.

What its going to come down to is wiring..all this stuff is. Match the LS Harness to the chassis.

My 1991 S10 is using Stock 1991 Gauges, I have a LS1, all LS Sensors, LS1 Fbody Engine Wiring Harness I adapted to the truck.