runpasthefence

iTrader: (2)

Hey guys, new to these transmissions and I've got a 4L80e going in my swap vehicle.

I bought some 6an trans cooler adapters and retaining clips from a local stealership. I asked the parts guy if there are any seals/o-rings needed for these fittings. He said no, but I need some verification before I go and throw a bunch of ATF on the ground...

In short, trans cooler fittings for 4L80e, o-rings or seals needed other than retaining clips?

Thanks!

darkhorsebob

What year model 4L80E do you have? If yours is a 1991-1996, all you need are the 1/4" pipe (6) AN fittings and teflon pipe thread sealant.
If yours is 1997-up, you won't be able to use the AN fitting for the rear cooler unless you can find someone who installs the lube extension in the fitting. This fitting intersects through a seal in the center support for the lube circuit.

forcd ind

iTrader: (7)

not sure what kind of adapters you have, if they replace the orig lines that are held in with "clip" fittings, then they would prob use o-rings-i would like to see a pic-the screw in adapters from the factory are 1/4-18 STRAIGHT fittings with o-rings, dont let someone tell you to use reg npt threaded fittings unless you want to crack your housing
ATI Perf Prods has the AN fittings w/washers that will screw in the trans,
but if you have a rear return fitting, then get a steel fitting and weld it to the
orig adapter
heres a pic of the ATI adapter

runpasthefence

iTrader: (2)

Sorry for not being clear. The transmission is a 2004 model. The adapters are from Pure Choice Motorsports.
http://www.purechoicemotorsports.com...cat/cat135.htm

forcd ind

iTrader: (7)

now that is cool-havent seen those b4-if you look inside the fitting that screws into the trans, there should be an internal o-ring, that will seal your fitting-make sure its there and you should be ok-there should also be a seal on the outside of the fitting where it meets the trans case
i orig welded a steel AN fitting onto the trans fitting, but when i put the hose end on, it hit the floor, so i screwed the trans fitting on, marked where it stopped, then welded a 90 deg fitting on pointed toward the front
gonna order a couple of those, thanks

slow67

iTrader: (2)

Yes, the factory fittings are 1/4-18 straight, but NPT works fine unless you crank it down really hard. I am using NPT with no issues, and I know some trans shops (sponsors here) use NPT as well with 0 issues. You actually are more likely to crack the older style case, because the angle of the fittings going downwards gives you less case strength.

salemetro

iTrader: (5)

Trick little part....ordered mine today...thanks for sharing the info!

spare tire

iTrader: (3)

+1 Thanks for the info, a little off topic but my girlfriend just picked up a 2000 3/4 ton silverado with a 6.0 and 4l80e. I just noticed the one transmission cooler line going to the radiator was leaking. So now im in the process of pulling the stock lines and running AN lines w/ an external trans cooler

allthrotle

iTrader: (2)

Is the 4l60e the same fitting size as the 4l80e? Im trying to run an external cooler as well.

Bad30th

iTrader: (13)

I just got off the phone with them and the fitting works for both 4L60E and 4L80E lines. I just ordered two.

Thanks for the tip runpasthefence ! I've been looking for a way to fix my return line on my 4L80E to use the factory fitting that lubes past the internal seal.

Cheers !
Rob (Bad30th)