Alwhite00

iTrader: (1)

I have a 99 6.0 engine and a 4L60E trans that has the bolt at 12 o clock - The 4L80E trans that was behind the engine also had the 12 o clock bolt. I measured the OD of the converter snout and the ID of the crank and they are the same, The converter looks to fit the hole in the crank fine. I left the flexplate on that came with the engine and bolted the trans up - I looked at the TC to flywheel bolt and it looks like if I slot the flywheel a little it will bolt up. As it sits the TC is about .080" - .100" away from the flywheel.

Not sure what the trans came out of but I posted a pic of the tag on it.

Any input is appreceiated.

LK

Flywheel / Back of engine


Torque Converter


Tag on trans


Bolt Mis-alignment


Bolted together.

Alwhite00

iTrader: (1)

Anyone?????

HoleshotHoop

iTrader: (1)

Your trans is a 2001 silverado or seirra Ext. cab 4x2, for 5.3L.. 6.0 w/4l80 flywheels are different.. you will need to get one for a 4.8/5.3. pretty sure there thread on here bout 4L60 to 6L

HoleshotHoop

iTrader: (1)

But to answer your question.. Yes it will work. just change flywheel, and will need new shorter bolts for 5.3 flywheel, most 6.0s run a crank spacer for the 4l80 that i've seen..

Circle-D_Brian

You have the "flat" 4l80e flexplate. You need a "dished" ls flexplate. That converter requires the ls style flexplate. The 99 and 2000 6.0 motors have the infamous long crank flange. You will need to run a custom converter. If you remove the flexplate I can verify the type of crank you have

-Brian

jesselee128

You can run an LT 4l60 and it'll bult right up .

04 GTO IBM A4. 1 of 273. 1 7/8 pacesetter long tubes. Pacesetter 3" catless mids. SLP LM2 catback. Vigilante 4500. B&M supercooler. IPS motorsports Dyno tuned @352/350

Alwhite00

iTrader: (1)

I got it figured out and i do have the "long crank"

https://ls1tech.com/forums/general-l...-did-pics.html

sicvic01

did you use the same flywheel in the first picture above and just add .250 spacers to it?

Alwhite00

iTrader: (1)

I used the 6.0 flywheel and the spacers end up between the flywheel & the torque converter.

I had another thread with pictures. https://ls1tech.com/forums/general-l...-did-pics.html

The main problem was that the TC would not go into the crank far enough to bolt to the flywheel.