Camaro_ZL2

Just wondering what's the difference between the torque converters(4l60e)I have a lt1 looking for a stall between.3200-4000 and I don't want to get the wrong one any hints to know which is which I feel kinda stupid asking this

Circle-D

iTrader: (21)

Main difference is the height. LT is ~5.950. LS is ~6.500. Several other differences, but that should be easy to spot...

Chris

mrvedit

I assume then this is the reason an older 4L60E from an LT engine will not work on an LS engine and vise versa? The key problem being that the newer 4L60e have a 300mm input shaft designed for the LS converter and the older 4L60E have a shorter input shaft for the LT converter.

I'm asking for confirmation/clarification because this question seems to come up every week on this forum and while we know "it doesn't work", I have not been sure of the exact reasons.

Circle-D

iTrader: (21)

You can use an LT style 4L60 Transmission and converter combo on an LS style motor, but you need to make a few changes... Either change to an aftermarket LS flexplate with the LT bolt pattern or drill out your OE plate to fit it, LS is 11.080" and LT is 10.750". You also need to either lengthen the pilot on the converter by ~.300" or use an extension sleeve.

Going the other way is not possible with a stock converter. The pilot on the LS style converter is to long and will bottom out in the LT crank before it hits the flexplate. But we can make a custom converter if needed.

I think that answered your question.....

Chris

mrvedit

Thank you for the detailed info; that sure helps.
Of course I always remind people that taking a 15+ year old stock transmission designed for < 300 ft/lbs and putting it on a 400+ ft/lbs engine probably will not have good results.

zukboi2004

So I am understanding this as a LS converter
will work in a LT trans with a flex plate & spacer?

I know this is a old thread, but, the search button works!
Lol

Circle-D

iTrader: (21)

Negative... 4L60 LT style trans has to have the LT style converter. But there are was to get the LT converter to bolt to a LS motor.

Chris

zukboi2004

An exploration as to why a LT trans won't work with a LS converter?

mrvedit

An LT trans has a 298mm input shaft while a LS trans has a completely different shaped 300mm input shaft. See the picture in this post:

https://ls1tech.com/forums/automatic...s1-4l60-e.html

An LT trans with a LT converter can be bolted to an LS engine using a GM spacer or a pilot extender sleeve. A recently started a new thread "All about Flexplates, Converters, Transmissions and Spacers":

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

02TA3312

How do you bolt a LT converter to an LS?

MaroonMonsterLS1

first off...this is your 2nd post and you're reviving a long dead thread
what's worse...there are threads that cover this already
what's even worse is those threads are in the sticky!!

to answer your question...you need the proper flexplate and spacer. Make sure the trans has the correct input shaft to match the converter.

This is why new users need a 30 day hold before they can post...

02TA3312

Couldn’t find anything about putting a lt converter onto an 98+ (Ls1) 4l60. Hence why I asked.
Really bothers you that much for someone to revive an old thread?

98CayenneT/A

Very much so, especially when you start from the top and read for a while to see what's going on then you notice the thread is 10 years old.

MaroonMonsterLS1

you're really so lazy you can't do a search...let alone a SIMPLE search as just looking at the top of the page for the stickies?
Circle D and Mrvedit prettymuch wrote it simply enough for anyone with crayons and a kindergarten education could figure it out

02TA3312

Well forgive me for wasting you guys’ precious time. Good thing the thread isn’t very long otherwise you might have wasted your whole day..

02TA3312

Was just lookin for some clarity bud. No need for the hostility

mrvedit

As the newbie hopefully learned, posting on old threads is not appreciated because it causes everyone who originally posted to get an email update and they then have to re-read the thread to determine whether its an ongoing thread or a long-dead thread.
Therefore, I am closing this thread.