Originally Posted by wmpotter399

I have a question for you. I came here looking to find out if I can use my existing 1993 4L60E transmission behind a 6.0 YL6. The title on your post says you are using a 4L60E. But your spreadsheet says that you used a 4L80E. Did I read wrong? Can the 93 4L60E be used?

Originally Posted by strutaeng

No, you cannot use the 93 transmission on the LS. Look here: https://ls1tech.com/forums/automatic...nge-100-a.html

Looks like 1993 4L60e was a 1-year only model.

Just get yourself any newer model 4L60e with the LS top bellhousing bolt hole. Any full sized truck or SUV GMT800 will work.

Originally Posted by wmpotter399

I guess I wasn't specific enough. I am going to use an Ace's computer and harness. They say that it will work the transmission. I was just curious about bolting up. Are spacers required? What flexplate? What converter?

Originally Posted by strutaeng

Oh, ok. I understand.

You need some special flex plate for sure. Looks like Speedway Motors has one, part #91604000 and it's $155. I think others make different ones but they do the same. I thought they were more expensive. I don't on the TC.

Here's the source that talks about the torque converter bolt pattern:[ I will post this later]

My concern is your 1993 transmission is not going to last with an LS in front of it. The earlier 4L60e models had a ton of issues and the internal hard parts were very weak, especially if they came with a V6. The later transmissions were improved for the LS powerplants and had better hydraulics.

Unless you are a transmission rebuilder and can upgrade all of the weak internals? IDK.

Originally Posted by wmpotter399

The LY6 is a Gen 4. The flexplate that you sent says it is for a Gen 3. Will it work?