My transmission went out on my 97 z28 and a buddy of mine has a 4l60 out of a 99 z28 I know these are different but could the newe style work in the lt1 cars

 

I don't know the answer to this, but let me get the discussion started...

The '99 Z28 trans will be an LS-compatible trans with a 300mm input shaft which in turn accepts an LS-compatible 300mm torque converter.
I could be wrong, but from what I have read and remember, the nose of an LS-converter will not fit correctly into LT engine's crankshaft opening.
Other than having a custom converter built, I don't know if there is a spacer or other solution to this.

I know the general advice will be to simply find a '96 or '97 trans which should be readily available. Your buddy should be able to sell his '99 for more than you can buy a properly fitting '97.

I look forward to corrections, updates or solutions to this...

 

the 97 has a 4L60e.....not a 4L60.....the last yr for 4L60s was 93.........but the LT1 and LS1 have diff 4L60e's

 

I Know they are different but that's what I'm asking is far as electronics go would it hook up and shift right

 

The electrical connector is the same and the tuning/shifting are compatible too.
However that seems a mute point if it doesn't physically fit/work together.

 

If a th350 will fit ls1 a ls1 4l60e should fit the lt1 all the bolts want be used but ad long as the electrical parts works I'll be good till a get mine built this is just a temporary solution

 

no the torque converter pilot is larger on the ls1 and the input shaft and stator is larger

 

You could most likely have someone make you a custom converter but at that point it would probably be cheaper/easier to find correct parts or fix what you already have.