4.8 vs. 5.3, same truck and gearing...?

[RS/SS 4.8]

As long as its the same year everyrhing should swap over. They are the same externally its the rotating assembly that changes.

[mopower440]

As long as its the same year everyrhing should swap over. They are the same externally its the rotating assembly that changes.

well, thats a problem, my truck is a 1999, they say the 1999-02 6.0 engine wont bolt up to my original 4l60e trans because the crank is longer or something on the 1999-02 6.0. They say to use a 2003 or newer 6.0 if i wanna keep my stock 4l60e trans, so would the newer 6.0 (2003-newer) still work in my 1999, meaning my stock wiring harness and all will hook up to all the 6.0 stuff?

[kerrige]

A 2003 6.0 long block will fit everything just fine although I would think that 60e would kick the bucket long before the 4.8

[RS/SS 4.8]

^^^x2. The intake will have to be from ur truck since its dbc and 03 up is dbw. Have fun with that 60e living behind it.

[mopower440]

A 2003 6.0 long block will fit everything just fine although I would think that 60e would kick the bucket long before the 4.8

I would have the 60e built up to handle it. May do the 6.0 swap instead of 5.3 then, just needs to be a 2003 to 06 to bolt to my 1999 4l60e right?

[RS/SS 4.8]

Yup

[mopower440]

awesome, thanks, now, is there any way to make the 1999-02 lq4 6.0 able to be bolted right up to my 1999 4l60e or is it just not happening? Ive heard 2 different thing, ive heard the crank is too long and just wont work, then ive also heard it will indeed work if i install my 4.8 flexplate onto the lq4 6.0....anyone know for sure? Once i know for sure i can start looking for one.
thanks

[RS/SS 4.8]

I believe the 6.0 with the flat flexplate wont bolt up but if its dished like the 4.8/5.3 one then u should be fine. Also another way of knowing if its the early style 6.0 is the iron heads. Maybe someone else will chime in n clarify.

[TXSZ66AVLANCHE]

I went from a 4.8 to a 5.7 and my mpg (under normal driving) actually improved. Stock 4l60E with 127k has held up just fine, so far I've had the combo for 10k miles and beat on it daily.