I AM BRAND NEW and Desperately need HELP!

leosavinoDFW said:

... limiting reagent...

Click to expand...

JEGS 603020: 4L60E Performance Transmission for 2005 & Earlier GM LS Engines - JEGS

4L60E Performance Transmission for 2005 & Earlier LS-Series Engines

www.jegs.com

1998_K1500_Sub said:

I think the reaction rate will be faster if you stick with an OE-style small block engine, e.g., a "Vortec" 383cid / 406cid, but swap an LS if that's what you want to do

If I was a betting man, I would bet you have the 4L60E in that 1998 L31 half-tonner, assuming it still has the stock transmission (which you said you had rebuilt). The other auto would be the 4L80E.

Just thinking out loud: Don't the LS engines use a different method of mounting the trans to the engine than was used in 1998? Will a 1998 4L60E bolt up to an LS? Below is supposedly a "4L60E for LS engines 2005 and earlier".

You must be registered for see images attach

JEGS 603020: 4L60E Performance Transmission for 2005 & Earlier GM LS Engines - JEGS

4L60E Performance Transmission for 2005 & Earlier LS-Series Engines

www.jegs.com

Click to expand...

leosavinoDFW said:

Hello!

Please help me out!!

I have a 1998 GMC extended cab C1500 truck (2wd) that had the 5.7l.
I just had the transmission rebuilt with HD components. It was the stock transmission I don’t know if it’s a 4l60 or 4l60E.

I am FINALLY ready (funds wise) to do an LS swap.

When all is said and done i would love nothing more than to plug and play. That being said i have NO idea how or what i need to make that happen.

So I beg you please help me out and point me in the right direction.

A) which ls engine do I buy? I’ve read that a drive by cable model is ideal vs the drive by wire, so do you I get a crate 5.3 or 6.0 that is drive by cable? Or get a low mileage junkyard engine...since i have tranny redbuilt

Next, For me the limiting reagent to this swap will be what is most compatible with the vehicle….wiring wise

Thus I’m starting this venture with you guys!!

Tell me what you think, as experts in the field ,

1) what would be easiest plug and play year/s LS motor? Do I get a dbc or dbw engine and harness? Etc.

2) Do I need just the engine, or also, the pcm and ecm and do you provide these with your engines? Do you need my factory boxes for tuning?


Again I’m really looking at starting from this for my project and it will determine the road I go.

I genuinely appreciate you help and patience in reading this, and I look forward to hearing from you

Best regards,
Leo

Click to expand...

Drunkcanuk said:

They will bolt up no problem, there is one bolt that doesn't get used.
That being said, some LS engine/transmission combos may require a spacer or different flywheel to make it work.

Click to expand...

1998_K1500_Sub said:

Will a 1998 4L60E bolt up to an LS?

Click to expand...

Caman96 said:

I just checked. There’s 20 threads of information on LS Swap. I would start there, it’s probably already written.

Click to expand...

NickTransmissions said:

Are you referring to 4L60Es or 4L80s?

If 4L60E, a 2005 4L60E will NOT bolt in behind a gen1 SBC without significant adaptation. (Different pumps, input shafts, converters, flexplates, etc).

If a 4L80, then yes, you can interchange from those two years as is.


No, unless it's an F Body transmission. Camaros and Firebirds/Trans AMs got the 300mm style LS-compatible transmissions in combo with the LS1 starting in 1998.

Click to expand...