tomulrich

iTrader: (2)

What parts CANNOT be used in the late style 4L80e (unit with the rear located cooler line)....from the earlier style?

Basically I am in the process of switching internals to a later model case and want to know if there are any parts that are specific to the later model units?

Please be detailed and give part numbers if possible.

I know the rear cooler line fitting has an extension on it.....

Thanks

FLT

iTrader: (1)

I hate to be one to say this but you are doing something that I really do not recommend. It would be cheaper to start with the proper core. The differences in the units are in the lube circuit. With the change in the lube circuit many parts have changed and are not interchangeable. Here is a quick list for you. Output shaft, valve body, separator plate, pump, center support, sun gear shaft, sun gear, main shaft, ring gear, and probably a few more that I can not think of right now. I do not recommend doing this swap. Vince

tomulrich

iTrader: (2)

thanks Vince....

I have the core for both styles.....the only reason I wanted to use the early style parts in the late case was the fact that I know they worked fine..

I know the output shaft is different(no oil hole for feed to case bushing) ....and the intermediate shaft (solid )......but a side by side comparison of the other parts you listed look identical...even casting numbers on the front of the pump are the same.

Do you think I should just use the parts from the late model unit...and make sure they are in good shape?

I actually have a custom output shaft for the C5 corvette rear differential..
Thanks

FLT

iTrader: (1)

I would use the parts for a later unit in the later case. I have seen guy's mismatch parts and melt down a unit very quickly. I understand that some of the parts might appear to be the same. Look closely at to how the oil has to flow through these parts and you will see the differences. Different style lube holes, deeper cut slots, different bushing designs, different length polished surface where bushing will ride and so on. It is very easy to make a mistake and the end result is scrap metal. Vince

tomulrich

iTrader: (2)

will do..

one last question....are the input shafts the same ....because I bought a
300m input shaft and was told it is good for all years....

Any other tips on this rebuild?

Thanks Tom

8a8mfh

iTrader: (3)

What year cores are you working with?

Better take a close look at the center support, in fact everything from the center support back have very noticable differnces.

tomulrich

iTrader: (2)

early and late syle each have th oil fittings in different areas.....if I were to quess one is a 93-94. the other is 99.

Tom

Stelth

So if you had a choice , would you build an early model 4L80E or a late one?

FLT

iTrader: (1)

That would depend on which motor it is going behind.

JMBLOWNWS6

iTrader: (17)

I beat the **** out of my early 4l80. Still going!

Stelth

LS1 twin turbo.

cheers

Stelth

Thanks for the info JM

FLT

iTrader: (1)

I would go with a 99 and later unit with the bolt hole at the 12 o'clock position.

Stelth

Thanks for the info Vince.

I know about the top hole , I have been told i don't have to use it if it's not there.

I am interested more in the internal differences.

Is there any benefits in performance and/or long term reliability , to getting an earlier model box built?

It's funny, some shops prefer early autos and some prefer late, why?

cheers

Randy WS6

iTrader: (69)

I would like to know too

jakeshoe

iTrader: (14)

Different planetaries, different sun gear, different intermediate shaft, center support, torrington bearings, sun gear shaft, overdrive sprag and carrier, etc.

It's best not to play with mixing these parts. They look very similar and unless you really know what you are doing you get to do it over and over until you figure it out.

Buy a good core, rebuild it, and go.

The earlier cores work fine, the difference is the lube flow and some slight strenght improvements. The early models are a way better design strenght wise than the best 4L60 derivative, so use what you can find.

Vince is right, for an LS1, use the '99 up preferably.

FLT

iTrader: (1)

Early or late to me really doesn't matter. I have both of which in 1000+rwhp cars and trucks. The early units had pistons that were prone to breakage. With the updated steel molded pistons this can be corrected. Also the early solenoids had issues and were updated a couple times to what we currently see in these units as new. To me I like to get as many bolts as possible installed into the block. With the LS1 engines and an early 80 case we loose this. Just a thought. Also with a late 80 you can install a structural inspection cover that you can bolt to not only the trans but also the engine oil pan. More strength!

Stelth

Thanks Vince for the great info !

T/A KID

iTrader: (12)

I am running into a issue, I am running a 94-95 4L80E I believe and I can't get the 02 411 ECU to work with the trans. Just stays in 2nd gear limp mode, could this be because of some of the internal electrical parts being an older model not work with a 02 ECU?

I have hp tuners with a 4L80E segment swap, pink wire shows 10.8 volts (new harness built by EFI connections), trans worked find when I had the TCI box hooked up to it.

Any other ideas?

Classic Style

Don't mean to hijack the thread, but reading between the lines, it sounds like an early 90s 4L80E is interchangeable with a late 90s/early 00s. Is that correct?

I'm looking to pick up an 80E for my '01 5.3L vortec and was wondering if I have to get specific year ranges.

Cheers