Hi every1
I bought 6.0L LQ9 2003 of Sierra for my 70 Camaro.
Which I am converting to LS2.i have th400 and just bought 4L60e 1997 of astro van.so like to know if I want to put 4L60e on my lq9 what parts need to be replace to install the trany with the engine.please if any one can write me a list what parts will I need.I have all the swap parts from brp.
Thank you

 

Plz can any one help me? Or if any one can tell on Sierra 2003 which transmission was used? Can I use that on my 70 Camaro with lq9 motor?

 

First a '97 will not bolt up directly to an LS engine, but only needs a spacer and the enlargement of the holes in the flexplate. My sticky documents the details:

https://ls1tech.com/forums/automatic...s-spacers.html

My real concern is taking a nearly 20 year old trans, likely with a zillion miles, which was designed for 300HP/TQ engine and hooking it up to a 450HP+ engine. If this trans was never rebuilt, there is a good chance it will fail after just a few WOT runs, which will not only ruin the trans and the converter, but also waste a lot of your time and/or money.
GM make improvements in '98 to handle the additional power of the LS1 engine and again in '03 to handle the additional power of LS2 engines. Besides the weak 3/4 clutch, the sun shell and forward sprag are common failure points when an old 4L60E is hooked up to a powerful LSx engine.

So, I would suggest putting the '97 on CL and finding a '03 through '08 4L60E/4L65E/4L70E. Probably not what you wanted to hear, but it will save your money, effort and frustration in the not-so-distant future.

Of course, there might be other opinions too....

 

Just found 4L80e silverado trany 2005 6.0L.
Like to know if it's fit directly without any mods on my 2003 6.0L lq9.

 

You will need the spacer that bolts on behind the flexplate and a compatible flexplate.
There are numerous threads on the electrical harness and/or tuning changes needed for a 4L80E; many others have done it successfully without too much trouble.
Personally I think this is a better choice than the old '97 4L60E.

Since you have a '70 Camaro, are you also on nastyz28.com? The "High Tech Retrofits" section has a wealth of LSx info for Gen 1 and 2 Camaros.

 

Yes I am on nastyz28 but not at high tech retrofits .
I have notice on my engine where the trany attach there is a notch and bolt on top of the engine coming out ...normally when the trany and engine attach it should be flat surface.

 

Strange. The 4L80E bolts up to the LS block without a bolt at the 12 O'Clock position. The LS also does not take a bolt at the 2 O'Clock position.
We might need to see a picture if you cannot figure it out.

 

mrvedit, sorry I just noticed that the bolt on top of the tranny, at 12 O'clock is actually just a piece of the previous tranny broken.. my error.

I just picked up a transmission/flexplate off a 2005 Silverado.


Just a question, when I had bought my motor, it didnt come with the torque converter but just a flex plate, the flex plate that came originally with the motor has 3 bolts for the torque converter, whereas the torque converter/flex plate that came with the 4L80E that I just bought has 6 bolts for the flex/torque converter.

Just wondering why would it be different? I guess the new tranny and the stuff will bolt right up, but why is it the the flexplate that came with the motor has different bolt?

 

I figured the extra bolt was a "piece of the previous tranny broken" but didn't know how to say that politely.

The 4L60E and 4L80E have different bolt pattern diameters. While all 4L60E converters have 3 bolts, I believe some/most/all 4L80E converters have 6 bolts.

 

So do you think that the trany and motor will attach together without any problem?

 

Yes, 4L80E bolt right up to a LS engine. You just need the correct flexplate and the GM spacer.

 

I think this flex plate already has spacer here are some pic if you can tell me that it's correct trany and pieces.

 

I didn't know such flexplate with built-in spacer existed, but it looks promising as long as the outer gear is dished toward the front of the engine so that the starter engages properly. However, I don't know much about the various flexplates.

Hopefully CircleD or someone else can give us all more insight on this.

 

thanks alot mrvedit try to put the trany and motor together hope it will work good.

 

That is the correct spacer & flexplate, The spacer will stick to the flexplate.

That trans looks to be out of a Chevy W4500/Isuzu NPR medium duty cab & chassis. Parking brake, Rollerized extension housing? Not a Silverado.

 

To be honest don't know from where it came out from but the guy said it's from silverado 2005 ...u think its good and will work with the engine without any mods? I give the wire harness ,and ecu to a company to upgrade so he will program and fix every thing u think its 4l80e and will work perfect?