bluebird71

iTrader: (53)

I found a good deal on a low mile 4L80 locally to replace my tired stock 4L60 in my '03 5.3 ECSB Silverado. What Im trying to find is a definitive parts list of exactly what I need for the swap in the extended cab: driveshaft, crossmember, wiring plugs, etc. I found some wiring conversion threads, but no specific parts and install threads or stickies on a 4L60 to 4L80 conversion. This seems to be a pretty popular swap though so please help point me in the right direction of where to get started.

All I am getting is the trans and stock TC so if anyone has any swap parts for sale, let me know as well.

03sierraslt

iTrader: (22)

All of that info is in the stickies.

https://www.performancetrucks.net/fo...k-here-460144/

https://www.performancetrucks.net/fo...-4l80e-424904/

bluebird71

iTrader: (53)

Yeah, I have looked through those stickies and that one says "4WD" swap. I have a 2WD, what do I need?

1FastBrick

iTrader: (17)

You still need to read the thread. The basics still apply. Obviously you don't have a transfer case or an other related parts but he shows the differences and what it takes to install in place of the 4L60E.

Any factory 4L80E part numbers might be like this and can be found here https://www.performancetrucks.net/fo...umbers-428941/

You may not need all the parts listed but here is some of the common stuff people are missing or looking for.

4L80E Conversion part numbers

#15000206 -Converter dust cover
#12551367 -6.0 Flexplate
#12563532 -Crank Spacer
#12553332 -Flexplate bolts SOLD AS A SINGLE (6 required)
#15812049 -4L80E Front line near bell housing to radiator
#15812030 -4L80E Rear line return from external cooler
#24233366 -4L80E Front case fitting near bell housing 1/4-18 NPS THD
#24233367 -4L80E Rear case fitting goes into center support 1/4-18 NPS THD
#24205103 -4L80E AUX Fitting retainer clip SOLD AS A SINGLE
#15198439 -4L80E Dipstick tube
#15183801 -4L80E Dipstick
#15013290 -4L80E Shift cable bracket at transmission
#15251895 -4L80E Transmission mounted gear shift lever
#15724745 -4L80E 4x4 Transmission case adapter
#11589040 -4L60/65/70/80/85E Toque converter bolt SOLD AS A SINGLE (6 required)
#15767858 -Transmission mount same as 60E

bluebird71

iTrader: (53)

Ok, so would I still need the 4x4 case adapter even though everythuing is 2WD? Also, the TC bolts are just the ones that hold it to the trans itself, correct? Will the same flexplate bolts I already have for the 5.3 to 4L60 not work?

Don't I need a different crossmember or have to modify the existing crossmember or something?

This 4L80 only has 60k on it. Should I just throw a shift kit in it and it should be good to go to hold power up to 500 rwhp for a good bit?

03sierraslt

iTrader: (22)

Obviously you will ignore the 4wd stuff, in your original post you didn't say anything about being 2wd so I didn't think about it. Yes you will need to modify your cross member as the 80e is a bit longer.

bluebird71

iTrader: (53)

Is it really worth all this trouble for a 80 over a built 60?

03sierraslt

iTrader: (22)

How much power do you plan to push? What is your truck? Is this for your 03 ECSB?

bluebird71

iTrader: (53)

Yeah, it's the '03 ECSB. I just plan on throwing these 243 heads and Z06 cam I have in there and eventually a roots blower on top.

bluebird71

iTrader: (53)

I went ahead and got the 4L80 today. The guy CLAIMED it only had 60k or so on it, but it's out of an '01. I only paid $300 for it with the converter, lines, shifter linkage, dipstick, and some partial wiring so that seemed like a decent deal even if it has more miles on it. I guess next I need to get a Trango HD 2 for it, a modified crossmember, some plug ends, and a flywheel with spacer. Is that about it? Will my ECSB 5.3 driveshaft still work?