transam1996

I'm in the process of switching a 4L80e and 6.0 into my 96 ta, something I'm curious about is the difference in driveshaft lengths from the stock to what I'll need to fit up to the 4L80e

slow67

iTrader: (2)

Same as a 4L60E, just different yoke. The 4L60E (f body) and 4L80E are within 1/16" difference in length.

bobbybennett23

iTrader: (1)

so the bell housing of the 4l80 bolt right up to a ls1?

97formula17

Im wanting to swap a 4l80e into my lt1 car. Do i need still need a special torque convertor? what about a spacer behind the flywheel? i want to use a rmvb but i have a street car so i wont be needing the trans brake. do i have to use the trans brake? is there one without it? should i go with a stall convertor or stock? all my car has is lt's and hooker catback. im going to get a tune very soon. its a toss up between a t56 and the 4l80e. Im trying to figure out what all i have to do. I like driving a clutch but if it would be easier and cheaper to do 4l80 ill give it a shot. any info would be great.

Chuchin2o9

My friend is gonna let me have his 4l80 swap so long as I give him everything needed to make his 4l60 again so I'm guessing everything needed will be there already. Both cars are in running conditon. However mine is a 98 his is 01. Do u have a part number for the standalone controller or is swapping pcm's an option? Hi will be tuning his car back to stock and selling it regardless

Racer383

Yes. IIRC you cannot use the one center top bolt but that is all.

bobbybennett23

iTrader: (1)

Does anyone know if a 4l80e from a express van with a vortec 5.7 will bolt to a ls1 anyone do this allready

4bangermustang

iTrader: (24)

It does. My buddies 80 in his car is from one.

bobbybennett23

iTrader: (1)

Sweet i was just thinking it should but didnt know 100% cause of it being a 5.7

MillsMotorvation

Great info on this, just got a 4l80, and got to get it in!

383camaroz28

iTrader: (22)

Would my speed inc flexplate work with a 80e? And what gap is ok from flexplate to converter ears?

MillsMotorvation

Hope I can find this when I do my swap!

Blackpanther99

iTrader: (8)

Very good info on here. Seen it before just hadnt post anything yet, but im in the process of a M6 to A4 swap.

MillsMotorvation

All I know is to run a TH350/400 you need the 4l80 flex plate, so if you installing a 4l80 you shuold be fine! If you going from a 4l60 to a 80, you need the 4l80 flex plate, and spacer. Not sure on the gap.

383camaroz28

iTrader: (22)

Hmm tomorrow itll be installed and ill see how far away i am, my flexplate looks exactly like circleDs, it bows out (if that makes sense)

mesterious

iTrader: (3)

Bump for updating thread. Great write-up info, but some outdated. Example: Frost 4l80e wiring harness instead of speartech. No OS change required.
Sonnax line extension for late model further back rear cooler line port.
Converters from companies.

justablur1

iTrader: (14)

can I just get my 98 pcm tuned for 4l80e? Or will I still have to get a 99+ pcm? It was a 6speed if that makes a difference. thank you

slow67

iTrader: (2)

You can run a 4L80E on a 98 PCM (yes, it will have an auto tune put on it though)

BIGDRAGON

iTrader: (9)

I'm swapping from a T56 to 4L80E and not sure If I wanna run a TCI stand alone,Speartech harness or run manual valve body. Any suggestions would be greatly appreciate it.

justablur1

iTrader: (14)

THanks!