evo462

iTrader: (27)

Aside from some minor internal differences, the biggest difference I've read about is the electrical plug connector. I was looking at the Speartech adapter harnesses for a T56 -> 4l80e or 4l60e -> 4l80e, and I don't see a different model for each plug. My 4l80e is a 93 model - will that make a difference as far as connecting it to my harness is concerned? Is the plug typically a part that gets swapped out on earlier models?

Jays_SSZ28

iTrader: (2)

I'm pretty sure all decent builders automatically change the wiring harness to the newer design, even some shade tree shops probably do it.

http://www.bulkpart.com/Merchant2/me...=4L80Esolenoid

If you're going to use an aftermarket swap wiring harness just get the internal wiring upgrade.
http://www.bulkpart.com/Merchant2/me...=4L80Esolenoid

No one makes a vehicle swap harness for the old style plug.

socal

iTrader: (1)

wiring is the same early to late as i know (I just got the wireing harnesss from speartech) the later is a bit better something about the oil return in the rear, but both are the same inside.

forcd ind

iTrader: (7)

my guess is they only have the updated harness adapter, since most 93's were changed over
GM had a retro kit for the 93's, 24200161
the old orig plug had something like 4 pins on the top row, 4 on the bottom,
the new one has like 6 on the bottom

Bill00Formula

iTrader: (4)

When I talked to a couple vendors it seemed like they prefer the older ones for a starting point of a rebuild. I was told that the overdrive is stronger in the older ones so if you plan to do high speed runs with a high horsepower car get the older one. I guess the anawer may vary depending on what parts will be changed.

evo462

iTrader: (27)

Thanks - I dropped the trans off at my builder already so I'll have to call him to check. Maybe I'll get lucky and it's the later style plug.

Jays_SSZ28

iTrader: (2)

You don't have the later style plug.

evo462

iTrader: (27)

ha...forgot I had pictures!

Jake's Performance

iTrader: (2)

Any builder worth his salt will be replacing a nearly 20 yr old harness/connector anyway.

Vince B

iTrader: (1)

LOL at the builder comment! Not to mention they leaked like a faucet!!

Vetal

iTrader: (3)

I can get 92' or 93' (don't remember exactly) year 4L80E 2WD, will it fit to LS1 engine? Or would I better get newer tranny? Although this is the only one 4L80 I can find in my area...

Vince B

iTrader: (1)

It will bolt up however the 99 and later units will utilize one more bell housing bolt. You can also get a structural inspection cover that you can bolt to your engine oil pan. The unit you are talking about would basically be like bolting up a th400 or th350. HTH Vince

Vetal

iTrader: (3)

I supposed that's not dangerous to put it pn less than 8 bolts?
Can't imagine what is structural inspection cover. And I don't know about THxxx, I've just recently taken a risk and sold my T56 setup and now researching how to obtain 800whp-capable 4L80E on budget

slow67

iTrader: (2)

I've heard of several guys are only using 4 bolts to hold in th400s and in the 9's and 8's with only 4 bolts holding them in because the 5th bolt hole is difficult to get to with a shield on it, and the 6th hole doesn't line up.

BlackScreaminMachine

iTrader: (17)

There are quite a few TH400 cars running less bolts then it can. We had a car that had a Shield and the installer put the bolt in place and in order to get to it we had to drop the engine. Originally before the trans install the car had Poly Motor Mounts, and then the car with to a Motor plate and the give is no longer there to let the trans hang down.

Vetal

iTrader: (3)

So with old-style 4l80 I utilize only 4 bolts? Those that are approx. on the same vertical level as the crank?

slow67

iTrader: (2)

5 bolts

1990LSx

iTrader: (9)

Are there any real strength issues with certain year model 4L80e's?

slow67

iTrader: (2)

You mean hydraulically or hard parts?

runninfromthelaw

iTrader: (22)

Do you even need the plug if you use a fmvb?